HALL_MULTIPLIER_FOR_ANALOG_RATIO_COMPUTER

Published:2009/7/15 4:08:00 Author:Jessie

Indium arsenide Hall plate serves as analog multiplier in circuit with photoresistor R and 2N174 grounded-emitter power amplifier that controls drive current of Hall generator. Differential amplifier A in feedback loop including lamp I controls Hall current. -H. H. Wieder, Analog Ratio Computer Uses Hall Multiplier, Electronics, 36:45, p 46-47.   (View)

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SMOOTHED_D_C_FROM_F_M

Published:2009/7/15 4:08:00 Author:Jessie

Mean d-c level, derived from f-m data on magnetic tape, undergoes R-C smoothing in three-transistor pulse-counting demodulator circuit so output can be fed to cro.-K.R. Whittington, Simple F-M Demodulator for Audio Frequencies, Electronics, 35:48, p89.   (View)

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SQUARE_ROOT_OF_SUM_OF_SQUARES_OF_THREE_VARIABLES

Published:2009/7/15 4:06:00 Author:Jessie

Output signal of Hall-effect squaring multiplier HG is fed to differential amplifier A. Amplified difference controls current through lamp that determines resistance of photoresistor r which, with 2N174, controls Hall current derived from voltage source.-H. H. Wieder, Square-Root Computer Uses Hall Multiplier, Electronics, 37:4, p 30-31.   (View)

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UJT_LED_PULSER

Published:2009/7/15 4:01:00 Author:Jessie

Rise time of output pulse is about 200 ns and width is about 25 μs when using 1 μF for C1. Reducing value of C1 reduces pulse width. C1 charges through R1 until voltage across C1 is high enough to bias UJT into conduction. C1 then discharges through UJT and LED and cycle repeats. LED can be any common type.-F. M. Mims, Electronic Circuit book 5:LED Projects, Howard W. Sams, Indianapolis,IN, 1976, p 30-32.   (View)

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100_W_AT_50_KC

Published:2009/7/15 4:00:00 Author:Jessie

Square-wave oscillator Q1-Q2 drives monostable gates Q3-Q5 and Q4-Q6 in parallel, and gates in turn drive push-pull amplifier using 25-amp transistorsQ7-08 lo deliver 100 w to load al 50 kc with overall efficiency of 70%.-S. L. Chin, New Circuit Design Raises Inverter Frequency Limits, Electronics, 35:43, p 59-60.   (View)

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EXTENDED_RANGE_ASTABLE

Published:2009/7/15 3:59:00 Author:Jessie

Square-wave output is extended in frequency by combining buffer A2A with opamp A2B functioning as capacitance multiplier for 555 timer connected as astable MVBR，Value of 1-μF timing capacitor Ct is increased in effective value by ratio of gain of A2B stage, equal to R3/R2. Output frequency thus corresponds to that of 4 7-μF capacitor, Negative supply should be equal and opposite to positive supply.-W. G. Jung, IC Timer Cookbook, Howard W. Sams, Indianapolis, IN,1977, p118-121.   (View)

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OUTPHASED_TONE_GENERATOR

Published:2009/7/14 3:47:00 Author:May

Bus amplifiers located between keying-system outputs and formant filters provide outphosed signals that lack even-harmonic content. Combinations of these produce organ lone colors called for by voicing panel.-R. H. Dorf, Electronic Organ Uses Neon Tone Generators, Electronics, 31:35, p 36-411.   (View)

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HIGH_LINEARIT_PHASE_DEMODULATOR

Published:2009/7/15 3:59:00 Author:Jessie

I-f signal is amplified by Q1, clipped by Q2-Q3,and resulting square wave phase-demodulated in coincidence Circuit,Q4-Q5 which also receives similarly clipped 455-kc reference signal. Demodulated output of Q6 is reshaped by clipper Q7-Q8, to give symmetrical output with linearity for deviations up to 85 deg.-W. H. Casson and C. C. Hall, New Phase-Tracking Demodulator Will Not lock on Sidebands, Electronics, 36:6, p 52-55.   (View)

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UNIVERSAL_TELEPHONE_HOLDING_CIRCUIT

Published:2009/7/14 3:46:00 Author:May

If you have Touch-Tone telephone service, you can put a call on hold from any phone in your house by plugging this simple device into any telephone jack. The universal hold circuit works with any phone that has a keypad with a # key. To put a call on hold, press the # key and hang up the phone. A timer extends the #-key function while you hang up phones that have a keypad built into the handset. The universal hold circuit first detects the dual-tone, multifrequency (DTMF) signal that is generated when the # key is pressed. It then activates a circuit that partially loads the telephone line so that the central office thinks a phone is still off-hook-even after it is hung up. The hold circuit remains active for 5 seconds after the # key is released, so the key does not have to be held down while the phone is being hung up. When any phone is again picked up, the hold function is canceled.   (View)

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TWO_TRANSISTOR_METRONOME

Published:2009/7/14 3:46:00 Author:May

Rheostat provides rate adjustment．- Transistor Manual, Seventh Edition, general Electric Co.,1964, p 379.   (View)

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ELECTRONIC_ORGAN_FREQUENCY_DIVIDER

Published:2009/7/14 3:45:00 Author:May

Ujt relaxation oscillator circuits reduce number of master oscillators needed and eliminate large inductors.- J. F. Cleary and D. V. Jones, A Unijunction Frequency Divider, EEE, 12:5, p 52-53.   (View)

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SYNCHRONOUS_DEMODULATOR_FOR_COHERENT_PULSE_DOPPLER_RADAR

Published:2009/7/15 3:57:00 Author:Jessie

C-w output of coherent oscillator is applied to control grid of one beam-defection tube, and radar re ceiver i-f output is applied to control grid of other tube in push-pull, so i-f signal and modulation products are in push-pull at the two anodes while c-w signal components are in same phase and are hence cancelled in following pulse difference amplifiers.-J. B. Theiss, More Target Data with Sideband Coherent Radar, Electronics, 36:3, p 40--43.   (View)

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CURRENT_REGULATOR

Published:2009/7/14 3:45:00 Author:May

Combines zener with opamp in bootstrap configuration. Regulated output current lO can be any value less than lz but must be much greaterthan opamp bias current. Current in zener is set by R1 to provide minimum of 1 mA. Performance can be improved by using Motorola MC1403 or other 2.5-V three-terminal voltage reference in place of zener. -W. Jung, AnIC Op Amp Update, Ham Radio, March 1978, p 62-69.   (View)

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AF_SQUARE_WAVES

Published:2009/7/15 3:57:00 Author:Jessie

With value shown for C1, frequency of output square wave is 530 Hz. For 5300 Hz, use 0.001 μF; for 53 Hz, use 0.1 μF. Circuit will drive ordinary crystal earphone or crystal microphone used as earphone.-F. M. Mims, Integrated Circuit Projects, Vol. 5, Radio Shack, Fort Worth, TX, 1977, 2nd Ed., p 52-56.   (View)

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NEON_OSCILLATOR_SYNCHRONIZER

Published:2009/7/14 3:44:00 Author:May

Metal clips on neon lamps are used to synchronize successive stages of neon-lamp relaxation oscillators, overcoming their inherent instability. Used in frequency-division type of electronic organ tone generator.-R. F. Woody, Jr., Clip Couples Neon Oscillators, Electronics, 39:9, p 77.   (View)

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TRANSFORMERLESS_FULL_WAVE_DETECTOR

Published:2009/7/15 3:56:00 Author:Jessie

Each half-cycle of input sine wave produces negative half-cycle at output. Both input and output are referenced to ground. Operating range is from d-c to 10 Mc.-C. Yarker. Full-Wave Detector Without Transformer.Electronics.39:15,p100-101.   (View)

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AF_RF_SQUARE_WAVE

Published:2009/7/15 3:55:00 Author:Jessie

Use of feedback resistor between input and output of each gate produces oscillation in each Schmitt-trigger oscillator, one operating at audio frequencies and one operating at radio frequencies. Both AF and RF can befed into NAND gate to give modulated RF, or outputs can be used separately as clocks for microprocessor.-B. Grater and G. Young, Build a Pulse Generator, Kilobaud, June 1977, p49.   (View)

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BILATERAL_CURRENT_SOURCE

Published:2009/7/14 3:41:00 Author:May

Output current through load is constant within 2% of value related to input voltage and resistor values, regardless of variations in load from 10 to 2000 ohms. Circuit is built around Precision Monolithics OP-08 opamp.- Precision Low Input Current Op Amp, Precision Monolithics, Santa Clara, CA, 1978, OP-08, p 7.   (View)

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PUSH_PULL_OUTPUT

Published:2009/7/14 3:41:00 Author:May

Transformer-coupled push-pull output for SG3524 fixed-frequency pulse-duration- modulated switching regulator gives output flexibility, allowing for multiple outputs and wide range of output voltages. Each output transistor operates alternately at half of switching frequency. Switching regulator applies voltage alternately to opposite ends of transformer primary, making transformer perform as if it had AC input. TIP101A rectifier then provides desired 5-VDC output at 5A.-J. Spencer, Monolithic Switching Regulators-They Fit Today's Power-Supply Needs, EDN Magazine, Sept. 5, 1977, p 117-121.   (View)

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2_KC_SCR_INVERTER

Published:2009/7/15 5:03:00 Author:Jessie

Circuit shows parallel inverter, but unijunction relaxation oscillators Q1and Q2 could also trigger series inverter, giving symmetrical operation. Q1 operates at twice the frequency of Q2.-D. V. Jones, Turn-Off Circuits for Controlled Rectifiers, Electronics, 33:32, p 52-55.   (View)

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