ELECTRONICS
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ELECTRONICS 68
Jan 8 FB protects power supply
Data errors detecting
Diodes limits input slope
Transistor bleeder
Zener power supply
Tunnel diode in PFM
Jan 22 Fast charged batteries (Ni-Cd)
Feb 5 Wien FET modulated oscillator
IC fast recovery FF
Ele 68 Inverted triode insulation meter
SCR regulator(zener reference)
Grounded base transistor mating logics
OPAMP drift compensation
Mar 4 Trafo divider for UHF frequencies
Schmitt trigger digital IC
Bridge rectifier clips surges
Mar 18 Staircase steps flat with a FET
Metal detector inductor
Photo printer UJT-SCR timer
FB for low capacitance bio probe
Apr 15 CMR optimization in OPAMP (Theory)
Ele 68 FFT (Theory)
Apr 29 A/D triple ramp converter
May 27 Inverter sine wave DC/DC (switcher)
Gated triacs clean AC switching
Pulse generator very stable
Active filters Part 1
Jun 10 FET voltmeter for transients
Boost OPAMP with transistors
Zener simulates muscle signals
Active filters;girators
Jul 8 Filtering noise in weak signals (Lock-in AMP)
Voltage comparator
Ele68 Zener protects series regulator
Diodes in multivibrators
Aug 5 Transistor speeds up charging solenoids
Dwell angle diode & Ohmmeter
IC gate controls triac with a audio trafo
Current source nodulation inÿOPAMP.
OPAMP boosts induced voltage
Mercury lamp ballast (Theory & circuits) switcher
Aug 19 FET & UJT in linear oscillator
FF isolates pulse from bounce
Schmitt trigger DTL NAND
SCR monitor for discharge rate of cells
Ripple calculation
Ele68 EXOR( diode bridge & transistor)
Triangular wave generator
Sep 2 OPAMP voltmeter
FB keeps torque constant servo DC motors
Active filters Negative impedance converters NIC
Sep 16 OPAMP simulates indutance
More power with zeners+trasistors
Parallel-T bandpass filter produces voltage gain
Active filters NIC (cont.)Circuits
Bootstrapping OPAMP
Oct 28 Increase range of relaxation oscillator
Ele68 MV with Darlington
MV fast rise time (20 nS with 10nS rise)
Nov 25 UTJ protects OPAMP against transients
Dec 9 Squelch gate reduces AMP drain
Transistor cancel indutive load effects
Multiplier replaces custom trafo (power supply)
Active filters:OPAMPs
Dec 23 Voltage regulator with 2 AND gates (uL914) chopper (switcher)
FET pre-AMP (G=1000 .5 to 300kHz,low noise)3 transistors
Eliminate excess of inductors in filters
Comparators in threshold converters (sine waves zero)
ELECTRONICS 69
Feb 3 Active filters Part 6 OPAMP
Feb 17 Safety of medical instruments
Active filters Part 7 Analog blocks
Mar 17 Peak detector
Track & hold diode bridge switched
Mar 31 Miller sweep with active load
PNP-NPN zener with variable impedance(oscillator?)
Active filters: NF Part 8
Apr 14 DC/DC converter(diodes,MV,10 to 100V,70%,10KHz)
Photomultiplier gain tempco compensated
Ele69 Active filters Part 9 Nonlinear elements
Jun 9 FET probe (two conductors)
Thermistor linearity circuit
Unijunction protects transistors
Log circuit eliminates diode bulk resistence effects
Jul 7 DC restorer clamp
Binary input to AC output(servos)
Jul 21 Constant duty cycle pulse train frequency variable
Aug 4 Eliminating bounce from switches
Transistor phase detector
Ele69 Inverted transistor switches DC voltage
RC filter pulse train duty factor controlled
Sep 1 Asynchronous pulse in tape data control
Pulse modulator regulates valve closure
Oct 13 Diode generator for complex functions
Heat failures of thermocouples
Oct 27 Irregularities in small shafts
Monitor for power failures(3 phases)
SCR preregulator in power supplies(zener DC trigger)
Multiplexers as logic circuits
Nov 10 Optical isolator speeds data transmission
2 stages peak-holding stores picoS pulses
Ele69 Design hysteresis circuits
Nov 24 Wide range FM discriminator(no tuned)
AC source drives tape stepping motor
2 phase oscillator (Matsushita)
Dec 8 MV separate pulses by widths
D/A Converter with TTL gates
Capacitor sets shape of ramp generator
Dec 22 FF stabilizes A/D converter output
Transistor chopper
Scope reference encoded waveform(delayed sweep)
ELECTRONICS 70
Jan 5 Filter Wien for AD converters (line noise)
Digital display resistor matrix
Underwater pinger oscillator(UJT)
Feb 2 Chip substrate temperature regulator (CA3045)
Feb 16 FB Checks thermal resistence
Zener in FB for symmetrical clipping
Gyroscope derived rate circuit-FET gate
Frequency meter,comparator & phase meter
Mar 16 Zener bootstrap for DC AMP
MOSFET transient free linear gate
TTL controls large signals in commutator
Mar 30 Negative impedance controls motor speed
El70 Signal detector for 5V supply
Low offset chopper (inverted transistors)
May 25 FET variable gain AMP
Q multiplier in audio analysis
DC/DC converter for + or - bias (switcher)
Jun 22
EXOR for phase locking
Motor dynamic braking emf reverses rotation
Jul 6 IC minisize bias supply oscillator (74H00 )
Switching regulator drives Nixies
Program for band pass filters & low pass . Examples
Jul 20 FB triggers SS from both polarity edges
FET phase detector as F/V converter
El70 FET variable resistance gives 90 phase shift
Switching regulators
Aug 3 Wave squarer shifts phase up to 360
Aug 17 Comparator & MV add up to linear VCO (V/F)
Charts for designing current sources
Aug 31 Fail safe flame detector
Hex inverter picks data from noise spikes(pulse width discriminator)
FET converts triangles to sines
Sep 14 Resetting at power on
El70 Diodes prevents power loss & burnout in converters
Oct 12 UJT stable VCO
DC/DC converter design (switcher)
Oct 26 Programable digital filter functions
Nov 23 Limiter preserves phase over 50dB range
Optoelectronic switch monitors line power
Dec 7 FET tunes active filter (double T)
ELECTRONICS 71
Jan 4 Battery discharge triggers alarm & shuts off
Photocell measures pulsed laser power
Jan 18 High voltage pulses avalanching transistor
SCR crowbar protection
Wien oscillator (lamp, .5% HD,MC1454)
Sequencial gate dont chop odd-length pulses
SS saves power
Ferrites cores for noise suppretion
FET cascode optimizes differencial AMP
Feb 1 AMP for OPAMP noise measurement
FET input voltmeter
Audio AMP with 1V cell
Feb 15 Counter sifts phase
Ele71 Series limiter tracks signal,finds symmetry
OPAMP delay & shape data
Mar 1 Josephson junctions(uses & effects)
OPAMP splits power supply
MV range 10000:1 (VCO)
AC noise meter (Ripplemeter)
Mar 15 Contact bounce suppressing
FB speeds phototransistor response
Mar 29 Diode thermometer
High voltage supply (.001%,500 to 3500V,1mA,diode bridge & trasist.)
OPAMP booster crossover free
Apr 12 AC transfers DC isolated( chopper & trafo )
Ele71 Compact low frequency antenna (dipole)
FET SS long pulse
Apr 26 12 hour digital clock
EXOR needs no supply
High voltage AMP (very fast)
Notch filter (movable zeros & fixed poles)
May 10 FET clamp for 10MHz
Impedance-lowering OPAMP speeds filter
May 24 Photoamplifier x photomultipliers
FF pair synchronizes pulses & floats clocks (JK FF)
RF preAMP low noise
Jun 7 Four layer diode out regulates zeners by 5:1
Diodes stabilize FET gain to 1% over 100C range
Ele71 Dual NOR gate + transistor generates 12 functions
Design of active bandpass filter
Jun 21 Gated clock cuts counter delay to 60 nS
Foldback current power supply
Digital circuit filters highs,lows & bands
Design FET differencial inputs AMP
Jul 5 Oscillator controls pulse width & spacing
AMP slew rate curves
Jul 19 Tunable active filter constant Q (150 to 1500,Q=30,dual pot,3 AMP)
Detector measures phase 360 range
Counting by halves simplifies odd-order couter
Aug 2 Null indicator LED pair (Ì+ .2mV)
Wide range MV
IC frequency doubler (10MHz)
Ele71 Design curves for AMP analysis (RF)
Aug 16 One variable resistor alters filter
Triggered sweep generator responds to 100nS spike
Broad band pulse generator(FET + NAND,.3 to 10MHz,20Mohm pot)
Aug 30 Pulse generator (4 inverters,on & off variable)
Low frequency oscillator with subharmonic syncronization(710)
FB zeros DC level of diodes gating circuit (tracking filters)
Electrometer low current measuring (FET &ÿMOSFET inputs)
Sep 13 Capacitance meter sawtooth reference
Phase countinuous frequency shift oscillator
Odd order counter symmetric
Sep 27 SS trigger for slow pulses
Ele71 FET supply tests bipolar current gain
FB pot extends MV duty cycle
Oct 11 One of eigth decoders( test & corrects parity )
Line driver isolation AMP
Diode & SCR protect multiple voltage supply
Dual OPAMP comparator controls ramp reference(MC1437l)
Oct 25 Positive & negative gates trim logic
High impedance driver boosts detector range(455KHz)
Scope curve tracer (low current only)
Filter design (equations- theory)
Nov 8 Transistor matrix driver
Switching regulator (LM311,7400,limit 10A,1%)
FET current source for ramp
Dec 6 Interrupt register secures data
Ele71 V/F converter with four layer diode
IC transistor array compensates temperature
Dec 20 PLL sample loop divider VCO
Digital phase shifter maintains quadrature (PLL)
High gain instrument AMP
ELECTRONICS 72
Jan 3 S&H Aperture time error nomograph
SCR reset for integrators
MOSFET FB control in audio oscillators
Jan 17 Bootstraped capacitor in UJT oscillator(.05% 0C to 55C)
FB current switch divides RF by 20
Tunable filter varies Q (Wien ,double pot ,Q 2000)
Jan 31 Staircase generator (.1%)
Schottky diodes gates AND
Feb 14 Doubling OPAMP summing power
Square wave generator
Two adders form BCD subtrator
Ele72 VSWR detector protects RF AMP
Feb 28 Transducer preAMP low power (FET input,1.5V)
Ele72 Differentiate & count to find frequency error
FB latch reduces memory recovery time
Transistor testing (gain,gm,Icbo,etc)
Mar 13 Voltage reference (741,6.4V zener,1.9ppm tempco)
Fast switching modulator reverses UHF phase
ECL gates stretch range of oscillators
Mar 27 Series connected OPAMPs null offset voltage
Linear signal limiting with FB multiplier (limiter)
Compare binary numbers
Finding open loop gain without opening the loop
Coaxial buses help suppress transients
Conductive heat transfer problems
Apr 10 Unclocked logic makes decisions
Ele72 H/W converter for analog samples
400Hz power supply
MOSFET bias for 0 tempco
Film for scope pictures
PWM replaces resistence in potentiometer
Apr 24 Laser interferometry (dual ramp ratio divider)
Regulating HV with low voltage transistors
OPAMP multiply time constants
SS & FF detects frequency bands
Active resonators in active filters (theory & pratice)
Measuring HF transistor gain
Ligth pen use in CRT & scopes
Testing IC chips (high speed)
May 8 SS divides by up to 30
Ele72 MOS data saved by battery (memory)
Triangular wave generator (8 decades ,.01 to 2MHz,6 transistors)
Timer 555 uses(PWM,missing pulse detection etc)
FET input OPAMP reducing bias current
May 22 SS with output comparator
Series resistance improves pot linearity
BCD addition in digital PLL
OPAMPs drift matched
Testing multioutput power supplies
Jun 5 OPAMP list
Frequency synthesizer
Linear amplitude modulator
FET audio squelch circuit
Settling time measurement with time delay
Ele72 Pseudo random pulses sequences & time delay
Jun 19 Diode thermostat (.05C)
Test A/D converter
MV with complementary outputs
Digital recording heads - cares & types
PCB edge connectors costs
Jul 3 Schmitt trigger prevents clock train overlap
Broadband limiter is phase transparent
Pulses number preset generator
Jul 17 Frequency doubler for any waveshape
OPAMP cancels video transients
Stable pulse generator (Progr.UJT)
Computational module (Log,AD433)
Spark gaps-uses
Jul 31 Logic probe LED display(MC1048)
Ele72 Scope 4 channel display
Control OPAMP gain with one pot
IC Schmitt trigger(7413)
Aug 14 Logic gates as D/A converters (7405 open collector)
TTL gates in pulse height analysis
LED voltage sensor
Digital ICs set temperature compensation for oscillators
Power losses in AMP
Aug 28 Wired OR DTL gates in multiplexers
Integrator resets itself (.1%)
Wien bridge in notch filter (60dB)
Sep 11 MV clock obeys digital commands
OPAMP with FB makes full wave rectifier
Active filter with band & frequency control
Ele72 MOSFET threshold in one measurement
Low pass filter design(graphic)
Sep 25 Logic converts synchronous motor to stepper
Ring counter eliminates false gating signals
Comkplementary output improves OPAMP responce
Capacitor self-ressonance frequency charts
Vanadium oxide tempco sensor (.05C)
Oct 9 Metal oxide varistor for transients
Generator varies pulse rate & width
Photodetector senses motion
MOSFET squaring circuit
Time measurement for capacitor,resistor & indutance
Low drift OPAMP analysis
Oct 23 FB linearizes resistence bridge
Ele72 Soldering iron for constant temperature probe
EXOR gate for bidirectional SS
Digital panel meter
Active filters tables (LP & HP) Vide Apr 12 corrections
V/F module(4701 Teledyne,.015%)
Optical trigger for scopes
Nov 6 Optical measurements(Photometry & radiometry)
FET OPAMPs
MOSFETs as multiplexing switches
Motor stepper driver
Voltage tuned filter(bandpass)
Instrument OPAMP for computer inputs
Suppression network for SCR converter
Test power supply
Ele72 Infrared intruder alarm
Nov 20 Decoder for modulated pulse widths
CMOS sums tones in electronic organ
Transistor gating cuts signal delay to 100pS
Multiplying scheme as alternative to count down timers
Wave form generator (8038)
Dec 4 Staircase generator
4A power supply
Binary division gives harmonics
Zero correction in OPAMPs
Power dissipation in microcicuits
Design of front panels
LED as sensor
Dec 18 Tachometer squelches point bounce
Ele72 AGC RF threshold detector
Phase comparator for servo loops(FF)
Make your switches for boards
Timing circuits for noisy environments
ELECTRONICS 73
Jan 4 Doubling voltage with cascode transistors
Linear RF modulation with OPAMPs
LP & HP tunable filter
Jan 18 Synchronous ramp generator
MV with one capacitor
Automobile ignition system
Feb 1 Programable SS
Power with 741 (22W,+30 -30V)
DPDP switch solid state
Design of program controllers
Approximating wave forms with exponencial functions
Feb 15 Negative resistence generator
Modulator tests hi-fi AM tuners
Ele73 Programable MV (four functions)
Digital filter varies passband
Mar 1 High power counter drives 20W loads
CMOS monitors Ni-Cd batteries
Switching large loads with logic signals
DVM as linear ohmmeter
Filter bandwidth nomograph gives sweep rate limits
CMOS gate as adjustable divider (4001)
Mar 15 Gate bias for NMOS from 5V (Chopper)
Control duty cycle & rep rate generator(10 to 10kHz)
Power supply foldback
Mar 29 Time delay extended
Current sharing regulator power supply(LM340,78xx)
Up/down counter syncr.
Ele73 Shortcuts with pocket calculators
Versatile breadboard
Apr 12 DC motor control (armature resistence)
Network is filter or oscillator
Monitor for battery voltage
Scope graticule with 3dB points
Thermally adjacent diodes balances transistor
Apr 26 V/C converter (4 -20mA)
Binary RF phase modulator
Data averager for panel meter
Scope detects narrow pulses
Precision comparator circuit
May 10 Varying comparator hysteresis
Circular voltage divider
Ele73 Tank circuit steps up CMOS driving voltage
SW generator (50Mhz)
Cable tester
Capacitor performance (tempco & freq.)
May 24 Charge balancing A/D converter
HF transistors temperature compensation
Gating circuits monitors real time inputs
Audio limiter (lamps,AGC,compressor)
Capacitors for AC power
OPAMP in active voltage divider
Jun 7 Road ice indicator
Zener+OPAMP reference (10V +- 7mV,0 to 75C)
Elminating offset error in sense AMP
CMOS crystal oscillators
Ele73 Pulse generator CMOS FF
Chopper OPAMP
Jun 21 MOSFET crystal oscillator
Varistor improves AGC
HV regulation with low voltage zeners
Uses of the 741 OPAMP
Temperature control with timer + thermistor
Stretch duty cycle of 555 timer
Timer + resistor SW generator
Timer monitors battery
Auto burglar alarm with timer
Timer temperature/frequency converter
Timer as line receiver
Timer delays
Ele73 6000V/microS OPAMP (LH0063)
Switched power supply
Jul 5 TTL synchronizes clock
A/D converter gives logarithmic output
Analog multiplier/divider for frequency locking
Quad NAND yields two frequency clock
Control tape recorder speed
Trim fast FET OPAMP (twisted wire)
Jul 19 Capacitor corrects drift in data AMP
High speed follower (1 nS delay,4 trans.)
Mark space demodulator with active filters
Check wired-AND
Ele73 D/A converter differencial linearity
Power rating of variable resistors
Aug 2 Series-shunt regulator power supply
Motor speed sampling regulator control
Digital transient suppressor
Staircase generator digital
Automatic erasure of storage scopes
Chart for intermodulation products
Aug 16 Chopper OPAMP (Texas 088)
Switchers:Theory & Pratice (555 & 550)
Pulse generator with binary input
AGC over two decades
OPAMP test circuit (5 DC tests)
Ele73 Electronic dice
Aug 30 Frequency discriminator with SS & FF
CMOS counter for 2Ã 70 pulses
First event identification
Power supply design simple
AC wave form table conversion
Sep 13 A/D converter with auto zeroing
Boosting IC regulator current
Digital clock dual mode display
Sep 27 Trimming networks impedance-sensitivity nomograph
Triac trigger precision driver (Audio)
Multiplier for wattmeter (signetics 5596)
Power supply variable (5V 8 to 17V)
Chopper OPAMP MOS (HA2900)
Ele73 CMOS switch for S/H (4016)
Power circuits (diodes & SCR)
Designing logic with microprocessors
Oct 11 Miller integrators as signals separators
CATV transistors as low distortion VHF preAMP
Switch controls auto air conditioner
D/A converter from transistor array
Optoelectronics & optical spectrum
Beam thickness in CRT display
Test thermal resistence sequencer
Scope triggered sweep (555)
PicoAmpere cares
Oct 25 Boost a 709 (300V/microS,15MHz,300000G)
555 Schmitt trigger
Ele73 Pulse width discriminator (NOR & SS)
Test clip logic analyzer(Fluke Trendar)
Nov 8 Digital phase shifter demodulator
Composite dual OPAMP improves response
Power supply zero ripple output
Design thermal demands - Radiators & heat pipes
IC plastic power devices
Ladder type networks analysis
HP 35 Polynomials & their roots
Storing two constants
Statistical analysis
RF wattmeter up to 50 W
Nov 22 Two wire link multipoint data
NanoS addressing system (registers)
Ele73 Digital filter (comb)
Gate threshold difference gives inicializing pulse
Scope with 8 logic inputs
Gray scale images on storage tubes Display
Flashing lamp alarm
Dec 6 Digital DVM design - signal conditioner etc
Dec 20 D/A converter (Adder & shift register)
DC restorer for video
Regulator for standby supply( high amper.)
Phase difference digital meter
Thermal detection with liquid crystals
AC source with audio AMP
Thermal analysis of power semiconductors (Theory -Heat sinks)
Temperature limiting boosts regulator current (723)
Ele73 Digital phase shifter handles 5:1 bandwidth
Voltage discriminator .1mV resolution (711)
Norton quad AMP(LM3900,circuits)
Building your DVM (2 2/3,Motorola ,staircase ramp)
Eletrometer FET (2N5909 & LM308)
DVM as current source
ELECTRONICS 74
Jan 10 AGC thump in AMP
Algebraic inversion with transistor array (CA3086,Log)
LED voltage regulator
LED voltage indicator
Jan 24 Forced air cooling -Thermal design IV part
Power supply 10A (723)
Multiphase clock nonoverlapping pulses
PLL for varying conditions
Impedance simulator for loads
UJT with PNP-NPN pair
Basic program for resistive DC cicuits
Feb 7 External gate doubles counter speed
Switcher DC/DC converter current spiking free
Ele74 SCR crowbar (723)
Microwave leakage monitor
Nonsequential counter design
Feb 21 Discriminator cleans signal noise
Controlling AC loads with CMOS (4016)
555 auto voltage regulator
Trimming closed resistor loops
Selection of A/D converters
Mar 7 HP 35 statistical analysis
Transistor array as thyristors
CMOS touch switch (4016,4044,4009)
Switching regulator constant current (723,1A)
Mar 21 Cassete recorder as phone monitor
Ele74 State variable filter(dual OPAMP)
LED null for 555 resistance bridge
Static RAM reducing power drain
Logic gate as FF
Isolator scope circuit for checking ungrounded voltages(optical)
Apr 4 Extend timing of two AMP integrator
Ignition system limits RPM
AGC FET OPAMP wide range (2 FETs bridge)
D/A current steering(theory)
Apr 18 Simplify binary number conversion
Storing data in a cassette recorder
Ele74 Music with IC timers
Tables to equations for calculator use (examples)
Logic tester for ICs
Scope probes;their uses
Monitor for 7 segments display
May 2 RF detector Schottky diodes
Crowbar senses load voltage
Simple gating marks both pulse edges
Computers networks on computations
Measuring access time of ROMs
Eliminating stray signals in gain switched OPAMPs
May 16 Thermal design : map heat flow (Theory) Part 6
Metronome
Ele74 Two color LEDs switch each other
May 30 regulator protects pull-up transistors
Tone bursts generator (2 555)
Adding two BCD numbers
In circuit IC tester for TTL & CMOS (4009,LEDs & diodes)
Jun 13 Noise blanker cleans audio
Variable voltage with adjustable tempco (.7 to 13V,-.3 to +.3%/C)
Probing noise from Hz to MHz (Probes details)
Two gates FF
Polynomial expansion beats calculator display limits
Jun 27 A/D converters in two chips(LD111,LD110,DVM circuits)
Combination lock
Serial multiplier for two five-bit numbers
Ele74 Power supply donw to zero
Thermal design : Heat exchangers in PCB boards Part 8
Unusual jobs for capacitance coupled logic
Test optical isolators
Fan out of CMOS buffers
Jul 11 Biasing improves clamping OPAMP
LED shows beat frequency
DC differential voltmeter resolves 1 microV ( Calibrator MIT)
Jul 25 A/D converters (theory)
Teletypewriter interface (Baudot data )
Diode pair senses differental temperature
Ele74 NanoS pulses with TTL SS (74121,74S00,rise 2nS)
Driving LEDs with CMOS
Trasistor capacitance multiplier
Measuring impedances at operating levels (complex,Smith chart)
Aug 8 Rectifier with three matched resistors
Decimal output from seven segments (74154,7404,7400,trans.)
Broadband PIN diode attenuator (AGC)
Design class A AMPs (Theory)
CMOS Schmitt trigger uses
Regulators protection
Aug 22 DC/DC converter voltage doubler (555)
SCR zero cross trigger limits power
Ele74 Analog peripheral in minicomputer chassis
Measure optical coupler speed
Cable tester programable
Simulating an NPN/PNP pair for HV switching
Sep 5 Indicator for PLL
PLL correction Sept 5 74
Window comparator with one OPAMP
Check electrolytics with voltmeter
16 bits D/A comverters
Listening to magnetic fields
Sep 19 Two components ligth sensor (Phototrans. & const.curr. diode)
Coding A/D for sign & magnitude
Control periods of 555
Ele74 Modeling the bipolar transistor Part 1
Diagonal axis to a scope (3D)
Selfpowered comparator warns when signal exceeds limits
Oct 3 Bipolar power supply (2 741 symetrical)
Filter programed digitally
Transients in FET analog switches
Cable tester
Triple Darlington with low saturation voltage
TTL level tester
Oct 31 Modeling the bipolar transistor Part 2
Coherent phase modulation to 100MHz(step recovery diode)
Single switch regulates number of pulses (burst)
Ele74 Power AMP as AC power supply
Two circuits indicate synchro shaft position
Standing wave ratios & impedances values (swr)
Nov 14 Analog gate & zener isolates 70dB (80MHz)(double balanced mixer)
OPAMP compares bipolar voltage magnitudes
Regulated power supply with one quad IC (0-20V,1A,.02%)
IC comparator with FB as clipper (squarer)
Integrated temperature transducers
Peak detectors(Theory & circuits)
Low frequency discriminator uses a analog delay
Nov 28 One transistor bias power output pair
Timer circuit for power on reset
Ele74 SW generator constant duty cycle (555)
7 segment code to decimal
Temperature transducers output display (charts for types of)
Gas & smoke detector with MOSFET
Keyboard with a pocket calculator
Dec 12 Rectifying with variable gain(1KHz)
Power failure detector(fast)
MV with SCR for lamps
Dec 26 Slow counter with a calculator chip
Window comparator temperature compensated
Plating cell timer
Counter for microprocessor interrupts
Step function generator (7441 decoder & resistors)
Ele74 LED brightness control (555 & CdS cell)
ELECTRONICS 75
Jan 9 CMOS specifications
FB keeps LED constant
Latch interlock switches
Wien oscillator & diodes (741,1N914,.3dB,diodes on Wien!)
FET programs OPAMP for invertible gain
PLL with dual bandwidth loop (fast)
Soluble mask for PCB solder
Jan 23 Water jacket induction furnace
AC RMS converter (Thermoelement BB4131 BurrBrown)
Ele75 D/A converter controls active filter
Intruder alarm with two oscillator(auto,capacitive)
Frequency divider & OPAMP generates sine wave
Designing microprocessors with discrete logic Part1 & 2
Sine wave clock :time delay & others
Inductor for memory driver
Power supply transients control (Spikes on turn on & off,triacs)
Capacitance measurement with a frequency meter
Feb 6 Safety barriers (Fire & explosion)
555 timer compensation (capacitor tempco)
CCD array overlapped clock phases generator
IC tester CMOS overvoltage indicator(May 30 1974)
Increasing a instruction set
Ele75 Field strengh (150KHz to 30MHz) RF
Feb 20 Phone line ringer optocoupled
Power supply 0 to 38V,2A,723)
Rectifying small signals (comparator & CMOS,3MHz,NE529 20nanoS)
Reference voltage (zener & OPAMP,.001,1N829,bipolar)
Two color LEDs status indicator
Touch keyboard TTL strobed(74150,74161,74194)
Preferred components table
Mar 6 Boost integrator time constant with a transistor(beta multipl.)
Keyboard interface (5740,2812,74125)
Digital command inverts signal
FM demodulator (NE563)
DC/DC converter(ML4270,MV & compar.
Ele75 CCD & analog filtering
Mar 20 Frequency calibration with TV color reference
Timer warns tape run-out
Antilog generator keeps VCO linear (.4%)
Diode silicon as radiation sensor( gamma & high energy X rays,10rads
CMOS FF various uses (SS,pulse limit detector,generator etc)
Solid state temperature sensors (Theory & circuits)
Factors for correcting AC power waveforms
HP-45 RF AMP design
Apr 3 Waveform from linear segments
Temperature to frequency converter (diode,0to100C,.3%)
NOR gate starts shift-register loop (Only one 1 in the loop)
Four point tests solder joints
Ele75 Variable capacitor from PCB boards
Apr 17 A/D converter 10bits (compar. + current source+clock)
Frequency meter overrange
Frequency doubler (7404,7400)
May 1 Data domain digital instruments -logic analizers
SCR noiseless buffer
Diodes protect logic level translator
Double ended power supply
CMOS phase meter (4011)
Check TTL wire bonds
Low drift instrumetation AMP
May 15 CMOS technology
V/F converters (Theory)
Ele75 Isolation with optical couplers
Tripping of protection circuits in power supply
555 as switcher (-10V, 10mA,5%)
DIP switch isolates faults
OPAMP + DVM as fluxmeter (search coil,integrator)
Seven segments shows Roman up to 5
Telephone plays a tune
May 29 TCS electronic anesthetic
Phase lock indicator (LED)
ECL oscillator 10 to 50MHz (MC10116)
Monitor for car battery
Jun 12 SS width is programable
Current & power limiter for switching transistor
Ele75 555 switcher (dual 15V from 5V,10mA)
Optical sensor overcomes ambient light
Calculating resistances for sum & difference OPAMP
Jun 26 Microphone preAMP gets power through signal cables
7 segments to decimal or BCD (converter)
Capacitive transducer for tension in muscle fibers(555,5608 VCO)
Lambda diode: P & N FET pair negative resistence device
LED as CRT in scopes
Plot total loads in recorders (sum constant currents,FETs)
Mixed dielectrics improves capacitor tempco
Compandor XR-2216(60dB)
Jul 10 Gain of OPAMP by digital control
HV pulse train (4KV,series conection,parallel charge)
Ele75 OPAMP measures diode capacitance(LM324)
Convert numbers decimal to any base
Coaxial loss by three measures
Jul 24 D/A converter in OPAMP programable gain control
SS with FB loop for constant duty cycle
Optocoupler converts AC tone to logic levels
Calculator sums two sets of numbers
Adaptative motor starter delays
Table for designing PI attenuators
Aug 7 Audio HD (.001%, Matsushita)
Instrument OPAMP sums 6 inputs
Touch tone phone receiver with AGC & filtering
Optoisolator curve tracer
Ele75 Bucket brigade clock CMOS divider
Aug 21 OPAMP outputs with fixed phase difference
Tapered audio volume control
ECL tuned oscillators
Phase modulation techniques in PLL ( Theory )
Edge triggered FF make 360 phase meter
Graphs for aperture time in A/D converters
Sep 4 Phase sequence detector
PreAMP for LF & VLF (Omega receivers)
Unity gain 50 ohms driver (10MHz
Organ oscillators (dividers)
Beta at constant power ( Transistor)
Thermistor as temperature regulator
Ele75 Tone logic probe
Sep 18 Digitally controlled OPAMP
Programable bilateral current source
Electronic graphic symbols
How to reduce noise pickup in ICs
Ignition dwell angle (VOM & circuit:LM3900)
Welder timer
Oct 2 Digital audio sine waves (4051,4024,4030)
Oscillator clock for AC power fails
Switchers in power supply
Active filter has stable notch (tone signalling)
CRT terminals to printer lines - optoisolation
Resistor measure with A/D converters (Ratiom.)
Ele75 555 controls life test cycling
Oct 30 VCO with 8038 (741)
Converter for teletypewriter driver
FET P & N Lambda oscillators(RF & audio modulation in same)
FFT differencial phase shifter (algorithm)
Nov 13 Sums BCD numbers (hardware)
Timers in DC/DC switcher converter (555,300mA,8-10V,.5%)
First of four responses
Active load constant power DC (AD435K)
Dec 11 Multiplexed detectors for water leaks
IC orientation current tester
Dec 25 Scope display of 8 signals
Process control with lead & lag compensation
Logic selects most intense signal (RF)
Lead & lag compensation of process control(Theory & circuits)
Ele75 DVM 2 1/2 digits quad norton OPAMP
ELECTRONICS 76
Jan 8 Current source grounded load
555 triangular waves
Jan 22 No inductors DC/DC converter (74C901 inverter)
Audio AGC with photocoupler(CLM6000 Photoresistor)
Indutive proximity detector
Feb 5 State variable low distortion oscillator(FET,.02%,quadr.,quadOPAMP)
Video distribution AMP (LM318,LH0002CN)
Feb 19 Transistors level voltage shifters(common gate or base)
Schmitt trigger with a comparator
Ele76 High power pulsed transistor tester (scope)
555 FF varies with manufacturer
Mar 4 Optical isolators in linear circuits (Theory & circuits)
Mar 18 Temperature regulator:Same transistor senses & heats
IC voltage regulator expands scale meter
Apr 1 Nonlinear lowpass filter rejects impulse signals (rise time)
FSK modem interface(4020,4013,4011,4016,LM3900,950KHz Xtal)
May 13 Pot & timer control up/down counter (set point p.ex.)
Regulator shares load with transistor (723)
Apr 29 Plasma probe (current in OPAMP)
555 multiple scope display
Electronics abbreviations
May 13 Diode & transistor thermometer
Ele76 Touch switch enters data
V/F with 555 & current source
Jun 10 PLL in synthesizer -pulses period in up/down counter
Back & forth scanner in printers
Hexadecimal display (large)
Jun 24 OPAMP oscillator NTC (nao convencional!)
CMOS auto intrusion alarm (switches)
Hardware helps in tracing progams(interrupt)
Jul 8 7490 as N divider
Square root circuit(OA91,BA100,741,1% 0 to 100V)
Tail biting SS keeps ligth on (555)
Jul 22 Synchronize pulse with clock in control
Ele76 Frequency doubler with SqW output
TTL logic tester displays H or L
Calculation for filter capacitor value
Speeds FM tuner measurements
Aug 5 Transistors parameters multimeter measurements
FM deviation with a spectrum analizer
Scope triggeered register freezes serial data
CMOS reset circuit
Analog divider (555,FET,741,V/F,amplitude modulator)
Aug 19 Optical coupling isolation circuits (Theory & pratice)
Sep 2 Notch filter (Andreieff,one pot)
Ele76 Calculator HP25 in spur analysis
Log ratio measures high resistances
Sep 16 3V powers nanoS pulse generator
Flash A/D converter (comparators & inverters)
Voltage doubler power supply(6.3AC,8V,16V,-8V)
Buried zener with heater(LM199,1ppm tempco)
Frequency counter simple
Sep 30 Scope sweep as frequncy multiplier
Oct 14 Frequency doubler & FF make phase shifter
8 traces scope display
Clip-on monitor displays count
Interruption in power surces (Q=CV)
Nov 11 High quality filters(theory & pratice)
Ele76 Standard oscillators calibration with color TV(May71 10,Mar75 20,)
Direct reading ohmmeter linear
Nov 25 Errors in calculators
Telephone ring detector without relay (interface)
Timer extends life of teletypewriter
Assure oscillator start(2 to 5MHz,7404,chokes,Xtals)
Kilowatts broadband matching trafos (transmission line)
Logic probe displays four modes (74C221,74C02)
555 drives fuel pump
SR56 in filter design
Dec 9 Regulator extends battery life
High gain low Q multiple FB filter
Ele76 Up/down latching sequencer energizer(7473,7408,7406)
Gate current from data sheet JFETs (Igss)
Relay actuating with charged capacitors saves power
ELECTRONICS 77
Jan 6 J-K FF to edge triggered set reset
Majority vote multiplexer circuit
Single step logic for microprocessor
Keyboard scan with I/O ports
Current trafo overload-proof
Cassete interface (8251)
DMM 4 3/4 has dual output (BCD & 7 segments,AY-3-3550)
Jan 20 Fast start gated oscillator (4011)
Nonoverlapping 2 phase clock
Composite video generator (CRT)
Input capacitance FB neutralization (2 OPAMP,for high impedance
sources)
Ele77 HP25 Networks transfer functions
Feb 3 Switched & linear power supplies ,voltage references(TL497,MC3420...)
Shift registers interface (74165,3 pairs lines)
50% duty cycle TTL clock
Memory backup 2.4V battery
Reading BCD with only 3 lines (I/O)
HP25 Fourier analysis of scope waveforms (errata May 12 Ele77)
Feb 17 Pulse height discriminator (2 555)
Gain control with analog switch (AMP,FET or CMOS)
Instantaneous power in resistors
Mar 3 HP signature analysis
Precision voltage calibrator pulse divider(4017,4001,.1%)
SCR motor crowbar with indutive kick (DC motor stop)
Regulator foldback current limiting
Ele77Dual OPAMP tempco stabilization (739,749,one heats)
Logic tester (7 segments)
LED drivers chart (TTL)
SR52 plots functions
Mar 17 Linear VCA (CA3080) or AGC (741 + transistor)
555 musical envelopes (synthesizers) Note on May 26:10microF omitted
Keyboard scan (4067,4042,4029)
Cross assembler link
TTL drives twisted-pair lines
SR52 AWG wire tables
Mar 31 Saturable core trafos harden latch memories
PROM mode effects binary to BCD converter
AGC has 60dB range (741,FET)
Ele77MOS OPAMP form pink noise source ( 2 3130)
Roving display checks I/O
SR56 deals with dBs
Apr 14 High Q filter with frequency controlled gate
Multiphase clock with decoders & FF
Noise filter switches time constants
Diagnose auto voltage regulator (4 3900)
Measure photodiode resistence at zero bias
Apr 28 S/H & OPAMP form special differentiator (AD582,741)
FET pair & OPAMP linearize voltage controlled resistor
SCR relaxation oscillators
Logic functions with multiplexers
Coil winding program HP25
May 12 Automatic clamp for symmetrical wave-form offsets
Ele77BiFET improves absolute value AMP(3140,1MHz)rectifier
555 freezes meter display
Sweep source reduces FM
SR52 finds complex determinant ( network matrix)
May 26 Interrupts by multiplexers
Costas PLL detects differencial PSK modulation(CA3089)
Thermometer diode quad OPAMP(LM324)
Capacitance meter (2 555 & counter)
Low threshold detector(LM311)
Jun 9 PLL & S/H control oscillator(4046,555,3900,4016)
Majority vote logic
First of two inputs (74S02,74LS14)
Ele77Interface multiplexer for D/A converters
Jun 23 Design of a DVM (3 1/2,Fluke)
CMOS PWM (4007)
Comparators replace set-point meters
OPAMP extends 555 timer range
Transistor temperature sensors (theory & circuits)
Pulsed source energizes solenoids & relays
Pulses check LED
Jul 7 SS programable pulse width
Resistor controlled LC network drives discriminator
Fail safe reset initializes micro
UP25 system noise figure
Jul 21 Nonmaskable interrupt saves registers
Ele77Ratio of two analog signals(digital V/F,S/H)
Synchronous SS
Gyrators filters
Time shared DVM displays
D/A converters controls power source
Aug 4 Fast attack detector in ultrasonic receiver
AM detector with biased diode
Maximum voltage detector of a set of inputs
8 traces scope display
FIFO buffers (interrupts)
Aug 18 Priority encoder
Ring counter generator for sine waves
Car & trailer ligths link
Resistors self-heating (charts)
Ele77256 states indication with only two LEDs (16 LEDs,74154,74157)
PCB checklist
Sep 1 Capacitive transducers measurement with 555 (VCO,F/V)
Resistor controlled selector CB channel synthesis (256 channels)
Double-ended clamp (quad AMP & 4052)
4004 processor extended inputs (multiplexer)
Counter with preAMP(30MHz, FET,ICM7208)
S/H bias current network(NF510,LM307)
Sep 15 555 overvoltage protector(low too)
SCR & relay electronic fuse
Phase detector unambiguous(360,74123)
Condutivity meter (quad OPAMP)
Ele77Check PLL loop sensitivity with a counter
DC power supplies in parallel
Sep 29 A/D converter improved by buffer(AD7550,microV levels)
Timer & converter generate slow ramp
Tolerance of capacitors with a MV
SR52 in second order differencial equations
Nov 10 Random number sequence generator (pseudorandom)
Optocoupler tranmits pulse width
Data converter drift (theory A/D & D/A)
Go/no-go tester for OPAMP
Single sweep for scope (74121,7476,Z axis modulation)
LED linear range extended by shunt diode(modulation)
Nov 24 Digital limiter for telephone line
555 time wiper delay
Ele77Calculator in cascaded tuned circuits (HP67) part 1
LED scope display (10 by 10 matrix)
Oscillator reacts to magnetic flux (8 to 14 KHz for +-.4 Oersted)
Dec 8 Tape recorder for low frequency (modulation XR2208)
D/A conversion
Calculator in cascaded tuned circuits(HP67) Part 2
Karnaugh map logic analyzer
HP25 antenna best angle
Dec 22 CMOS metal detector
FM demodulator(CA3089 & CA3189)
Keyboard programs OPAMP gain
Extending linear scale ohmmeter (Up to 500Mohms)
7 segments generator displays PROM on a scope
ELECTRONICS 78
Jan 5 Wind-chill index display (weather data)
RAM & D/A wave generator
Diode digital thermometer (MC14433,.1C)
SR52 scales data for drawing
Jan 19 TENS pulse generators
Split current source damps reative load oscillations
Half-integer divider (4030,4013)(N-1/2)
DC/DC power supply down to 1V (switcher,12V,1A,LM311)
Differential optical coupler linear (Theory & pratice)
Counter & scope for precision
Strip line with HP67
Ele78 100% duty cycle out of a 555
Feb 2 Priority encoder
Switching multiplier(.05%,4016,741,308,PWM)
Liquid nitrogen level(diode sensor)
Dynamic range of log AMP
Calculator in transmission line (SR56)
Feb 16 Nonuniform data-channel sampling
PLL filters most inputs (4046,8038)
Modulators compensate tape recorder errors (dual channel pilot)
Scanner tests diode matrix
Mar 2 Module (AD433J/B) linearizes transducers
Reference power supply (REF-01)
Interfacing a DVM to a micro(F8),(LD131/130)
Ele78 Waveform integrator averages over variable elapsed times
Mar 16 Scanned keyboard activates 8 tones generator
Frequency multiplier uses combinational logic (SqW,up to four times)
Semiconductors in nuclear environment
Ultrasonic receiver gray tone display
High speed digital servo stabilizer
Divider by N generates SqW for odd N
Mar 30 Sweep ratio extender by capacitance multiplier
Synthesizer interpolator extends number of channels
SS & counter multiplex pulse width encoders
SR52 Cauer filter group delay
Apr 13 Diodes & integrator brake small motors
PLL: D FF senses lock(565,562)
Ele78 SSB : delay lines help generate quadrature voice
Two diodes simplify hex-keyboard software
Subtractor eliminates OPAMP offset & common-mode errors
Apr 27 Ultra fast unity gain buffer AMP (Dual transistor 2N4854)
CMOS dual charge flow extend pulse repetition rate(4093,4007,.5microS)
PROM bootstrap loader
Data acquisition in a chip (ADC0816)
Ligth detector checks optical cables(FPT130B,TL074,pulse total energy)
Pilot lamp stabilizes crystal oven(LM3911)
Tester for solar cell efficiency (OPB730,555)
May 11 SR52 : Z transform (sampled data program)
May 25 A/D converter with log output(RC discharge
clock(74192,555,741,12bits clock(74192,555,741,12bits)
Ele78 Switching mode control of DC motors(.01HP,311)
Jun 8 Scope calibrator band gap reference
In-range frequency detector(MC14528,4013)
Cassete data micro interface(74132,4013,7401,4000 bauds)
Filter eliminates oscillations in switched converters
Mating ECL & TTL families
HP25 finds maneuverability
Jun 22 Programable frequency multiplier
Electronic piano matrix tone generator
Double balanced mixer(F1+-F0,4016,HA2520)
Three LEDs null detector
Jul 6 Built-in delay in alarms(555)
Audio noise blanker (radar pulses,ignition)
Ele78 4 function calculator times long intervals
Jul 20 Ultrasonic pulser(100V to 300V SCR voltage multiplier)
Servo up-down ramp
Constant voltage & current with two regulators(723)
Data pulses to histogram analyser
Nyquist plot predicts stability limits (HP25 program)
Aug 3 Photodiode radiation monitor(diode,metal.Mylar window,PIN HP,wideband)
Auto alarm ,door opening
Boosting OPAMP roll-off extends range of filters
IHD extending the range of tester(Intermodulation)
Aug 17 FM squelch response :tuning meter muting
Cascaded FF periodic sequence generator
Improve response of phototransistors by bootstrapping(FTP120,6x)
Ele78 Crystal time bases(Theory)
Aug 31 Width pulse multiplier(digital,external clock)
Sep 14 Controller selects mode for multiphase stepping motor
Low power transistor curve tracer
Digital differentiator determines shaft acceleration(5bits)
HP25 SCR conduction angle,power (program)
Improving phototransistor pulse response (5microS, IL-CT6)
Oct 12 Sine wave from triangle in diode generator(6 segments,<1%)
Open collector gate switches RF
Frequency multiplier with F/V,D/A,V/F !!!(D/A multiplier)
Nov 9 Zero sensing up/down counter reverses in complements (sign too)
AMP audio switched supply(parallel output,diode switch)
Ele78 Protection of high current power supplies
Nov 23 3 phase,zero voltage detector with photoisolators(SCR,etc)
Quad OPAMP generator in-quadrature waveforms(SqW & triangle)
Logic for step,run & halt commands with one button
Self-balancing bridge for thermistor mounts(HP478A power meter
Picoampere meter (DVM input impedance)
Dec 7 Wien bridge selects notch filter bandwidth
Comparator generates pulsed output
CMOS gates switch higher than the voltage supply
Wire pair multiplexes data & power for display
Dec 21 Diodes adapt V/F converter for bipolar signals
Prescaler for 135MHz counter
Ele78 Recorder time markers from clock module
TL59 convolves functions in time domain
ELECTRONICS 79
Jan 4 Filter levels output of Wien oscillators
Smoke detector generator for long delays(SD1A)
Zero crossing photoisolator for SCR
Digital strain gage eliminates A/D converter(555 VCO)
CMOS tester for assembly errors
Jan 18 CMOS OPAMP offset errors(ICL7600,novel circuit)
Control programming with high level languages
Circuit phase-locks generators over 360
Unspecified 8085 codes
Selectors squeeze data in RAMs
Feb 1 Multiplex display
Using assembler in high level languages
Interface unites micro with calculator (Coprocessor)
HP25:Short vertical antennas
Feb 15 Touch-tone decoder mates switched filter with digital logic
Six-variable logic with multiplexer (74150)
HP67:OPAMP gain & CMRR
Mar 1 CMOS oscillator with 50% duty cycle
FB in phototransistor bandwidth(MRD300,100nanoS,epitaxial)
Servo minimizes hunting (DC motors)
Measuring OPAMP common mode impedance
HP67:track of communications satellites
Mar 15 Forth programming
Peak detector for narrow pulses(50nanoS,3V,1%,LH0024,1N6263,2N5196)
Ele79 Optoisolator initializes signal-averaging circuit(LM6000,Clairex)
Timer sawtooth generator(555,30KHz)
8085:8 by 16 product
Pseudorandom integers assembler program
5 state LED display monitors paging system
Mar 29 Rate multiplier controls noninteger frequency divider(5497,54161)
Standby crystal time base backs line clock(Xtal 3.58MHz)
Voice pause halts tape playback
Linear ICs runs at 1V level(Band gap reference,LM10)
DVM has audio output(MC6820)
TL59:S coeficients into-port net parameters
Apr 12 Analog IC dividers(Theory & pratice,Burr-Brown)
Low dropout micropower regulator(LM224,5.2V)
Ele79 Missing pulse detector frequency independent
Charge pump cuts compandor attack time(NE570,LM324)
Serial jobs PROM controller
Discriminator computes frequency differential (.1%)
8 channel scanner data multiplexer for chart recorder
PLL:Reducing even-order harmonics
Apr 26 Call controller
Up/down counter data over a single channel(multiplexing)
LEDs track signal level (8 by 8 matrix)
IEEE-488 bus interface
Pulse width range tester
HP97:Microwaves couplers response
May 10 Bilateral V/C converter
CMOS binary to BCD converters
Ele79 Power line harmonics measurement with a notch filter(Wien)
Resistor trims regulator voltage(+-1%)
8080:32 by 16 bits quotient program
May 24 Peak detector for fast pulses(10nanoS,.1 to 1.3V,4%,1435,LF356,FETs)
Wideband linear ramp(200V,50KHz,LM0024)
Digital peak detector for 4 bits(7485 comparator)
Capacitance meter PLL(1%,10pico to 1microF)
LED scope with a dot/bar driver
8080 hardware breakpoints (debugging)
Jun 7 Pascal programming Parts 1 & 2
Bridged-T filter selects frequency & bandwidth (notch)
Pulse generator displays parameters(pulse periode & delay)
CMOS triac trigger (OPAMP CA3160,4069)
Ele79 Gyrator filter(TCA580 gyrator,TL083)
Bipolar V/F converters (Theory & pratice,National LM331,.01%,10KHz)
Aug 16 10A peak ammeter (S/H,DVM,.2ohms)
Switched current source for I2T
Dual color LEDs synthesizes polychromatic ligth
Clock tells time out loud (6800)
Aug 30 CMOS counter-decoder pair sets divider modulus(74C161,74C154)
Shift register white noise generator(4006,4021,4030,25 stages)
Instantaneous frequency meter for biomedical use(1/T,AD532 divider)
A/D converter(AD7574,8bits)
Diode wind-sensor anemometer
MC6800 PROM programmer
Sep 13 Solar power regulator charges batteries
Triac 0 to 360 firing point trigger
Ele79 Pattern generator simulates double-density disk data
ADC0801:Sampled data converter A/D,charge balancing comparator
Cascaded regulators
HP67:Antenna polar pattern
Sep 27 8 bits bus feeds 16 bits micro
Add programmability to a power supply
Floppy decoder
Using RAMs (static)
Micro control of universal motors(triac)
Supersensitive
measurements(A,V,heat,pressure,friction,charts,Keithley)
Ele79 Line distortion telephone tester
TL59:FFT program
ELECTRONICS 81
Apr 21 AGC threshold with FET OPAMP
Reducing offset in video OPAMP(integrator)
Time slot assigner for data examination
Reading a dual trace scope with +-.025(S/H,5 1/2 digits DVM,LM398)
6909 debugging program
May 5 LM392 AMP & comparator has many uses(sampler,filter fast acquisition,
RTD sensor 0 to 500C,1%)
Auto alarm
Measuring impedances ratiometrically
TRS80 :Load cassete data twice as fast
May 19 Encoder pulse FB multiplier (digital,74379,74159)
Power fail detector (micro)
Ele81 Subroutine tests RAM (nondestrutive)
HP41:Pseudorandom sequence
Counter timer resolves 1microS
Jun 2 FM receiver (MC3359)
Deglitcher-delay serves as pulse generator
AGC in voice-operated mike
Linearizing thermistors with a single resistor
Sine oscillator multiple phased(without nonlinear components)
SS timing error LED indicator(ECL,10231)
PWM analog signal isolation(current reference balancing,60Hz clock)
Jun 16 Shaft encoder data (4077,4029)
Positive regulator works with negative supplies(LM396)
Ele81 Dual tones advance slides
Light pen generates pltter signals
Basic:LC ressonance program
Jun 30 FSK transmitter uses two gated oscillator
Micro sound generator
Upgrade MOS performance
Relocable code for 8 bits micro