Circuit Diagram

LINEAR_VCO_1

Published:2009/7/14 4:44:00 Author:May

Operates over control-voltage range of +10 mV to +10 V to provide either square or triangle outputs from 5 Hz to 5 kHz, Can be used for instrumentation or electronic music applications.- W. G. Jung, IC Timer Cookbook, Howard W. Sams, Indianapolis, IN, 1977, p 174-179.   (View)

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GAIN_PROGRAMMABLE

Published:2009/7/14 4:41:00 Author:May

Gain of non-inverting opamp can be programmed with standard digital logic levels. With input at 0 V, Q1 is turned on but is held out of saturation by Schottky diode D2. Resulting opamp gain is (R1 + R2)/R2.If R2 is 1.13 kilohms and R1 10 kilohms, gain is 10. When input is 5 V, Q1 is off and gate of Q2 is driven to -15 V. Gain now becomes (R1 + R2 + R3)/(R2 + R3). If R3 is 8.87 kilohms, gain is 2.-K. Karash, Gain-Programmable Amplifier, EEE Magazine, Sept. 1970, p 89.   (View)

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FLASH_TIMER

Published:2009/7/14 4:35:00 Author:May

Provides properly synchronized flash illumination for cameras in response to subcarrier pulse commands from uhf receiver.-F. M. Gardner and L. R. Hawn, Camera Control System for Rocket Sled Tests, Electronics, 33:14, p 63-65.   (View)

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POLARITY_REVERSING_SPLIT

Published:2009/7/14 4:34:00 Author:May

PHASE DRIVE-Half of 9614 polarity-reversing line driver feeds pair of Hewlett-Packard HCPL-2602 optically coupled line receivers through coax cable. Cable-grounding switches A and B change performance Closing only switch B enhances common-mode rejection but reduces propagation delay slightly. Closing both switches optimizes data rate. Schottky diodes at receiver inputs improve data rate, NAND flip-flop at output greatly improves system noise rejection in split-phase termination of line．－ Optoelectronics Designer's Catalog 1977, Hewlett-Packard, Palo Alto,CA,1977,p158－159.   (View)

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CONSTANT_CURRENT_REGULATOR

Published:2009/7/14 4:33:00 Author:May

Uses transistor ad variable series resistor. Current will remain within 10% of 10 ma from short circuit up to maximum load of 400 ohms. - Zener Diode Handbook, International Rectifier Corp., 1960, p59.   (View)

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FILM_TIMING_MARK_GENERATOR

Published:2009/7/14 4:33:00 Author:May

Instrumentation recorder for plasma studies uses discharge of capacitor at beginning of each plasma pinch discharge to trigger lash tube, light from which is chopped by glass disk driven at constant speed by synchronous motor.-J. J. Pearson, Instrumentation for Plasma Propulsion, Electronics, 33:24, p 66-69.   (View)

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CURRENT_MODE_SWITCH_FOR_LIGHT_EMITTING_DIOE

Published:2009/7/14 4:33:00 Author:May

Peak currents of 2 amp ,with 50 nsec and fall, drive diode to give pulse-light communication. -E.L. Bonin, Drivers for Optical Diodes, Electronics, 37:32, p 77-82.   (View)

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TEMPERATURE_MONITOR

Published:2009/7/14 4:41:00 Author:May

The temperature sensor is a resistor, R4, with negative temperature coefficient (NTC); the resistance of such a resistor drops when its temperature rises. Resistors R4 and R3 are part of a resistance bridge whose variable branch consists of R1, R2, and P1. The metering diagonal is connected to the inputs of comparator IC1a. The voltage at the inverting input of IC1a is set with P1 to a level that with normal temperatures is a little lower than that at the noninverting input. When the temperature rises, the resistance of R4 falls. This results in the comparator's changing state (to low), which causes the piezo buzzer to sound. Care should be taken to ensure that the voltage across the metering diagonal does not drop below 3.5 V to prevent the common-mode dynamic range of the LM393 from being exceeded. The NTC can be a 5- or a 10-kΩ type. It must be in good thermal con-tact with the heat source. Preset P1 must be set to a position where, after the part or device being monitored has attained normal operating temperature, the buzzer just does not sound. The buzzer must be a 5-V type.   (View)

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HALLOWEEN_PUMPKIN_BLINKER

Published:2009/7/14 4:40:00 Author:May

Neon lamps blink alternately in eyes of pumpkin for 0.5-sec duration, with 0.5 sec between blinks. Will also serve as roadsid blinker .Although NE2's can be used, LNE17's can be brighter and more effective.-More Glow.Lamp Circuits, EEE, 12:2, p 106-108.   (View)

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LINEAR_VCO

Published:2009/7/14 4:40:00 Author:May

Two sections of LM3900 quad linear opamp provide linear response for inputs of 2-12 VDC, Circuit can be adjusted with 1-megohm pot so 4-V input produces 400-Hz square wave at output, 5 V gives 500 Hz, etc. First opamp is connected as integrator and second as Schmitt trigger. When Schmitt output is high, transistor is turned on and diverts current away from noninverting input so integrator output ramps down toward ground.-C. Sondgeroth, More PLL Magic, 73 Magazine, Aug. 1976, p 56-59.   (View)

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TWO_LAMP_STROBE_BOOSTS_FLASH_RATE

Published:2009/7/14 4:39:00 Author:May

Two discharge tubes provide shared cycle of operation, to boost stroboscope firing rate to 1,000 flashes per second. tamp circuit, with range-switched discharge capacitors, receives triggers in alternation.-L. H. Barrett, New Circuit Improves Stroboscope Versatility, Electronics, 32:32, p 116-118.   (View)

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FLASH_DELAY

Published:2009/7/14 4:39:00 Author:May

Supressor-gated sanatron pentode provides adjustable delay for changing spacing of lashes.-P. Scott, Microflash and Pulse Stimulator Tests Human Optical Response, Electronics, 34:27, p 48-51.   (View)

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±15_V_TRACKING

Published:2009/7/14 4:39:00 Author:May

Dual-tracking connection for Fairchild μA78S40 switching regulator operates from single 20-V input Efficiency is 75％ for＋15 V and 85% for －15 V, both at 100 mA. Output ripple is 30 mV.-R. J. Apfel and D. B. Jones, Universal Switching Regulator Diversifies Power Subsystem Applications, Computer Design, March t978, p 103-112,   (View)

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FLASH_TUBE_DRIVE

Published:2009/7/14 4:39:00 Author:May

Generates low-impedance positive pulses having adjustable amplitude but constant durcttion, for driving flash tube to give same intensity-time characteristic as other fiash tubes having different colors.-P. Scott, Microflash and Pulse Stimulator Tests Human Optical Response, Electronics, 34:27, p 48-51.   (View)

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FUNCTION_GENERATOR

Published:2009/7/15 3:13:00 Author:Jessie

Desired function of input voltage is developed across RC and inverted by Q4. One application is for computing ground range of radar target front slant range. Transistors eliminate need for d-c amplifier.-D. R. Chick, Boosting Function Generator Output with Transistors, Electronics, 33:13, p 75-76.   (View)

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BALANCED_LIN_E_TRANSMISSION

Published:2009/7/14 4:38:00 Author:May

Transmits data at rates up to 0.5 MHz over twisted pair to Texas Instruments SN75152 dual-line receiver. Other section of receiver is identical and can handle additional twisted-pair input. Diodes in lines are required only for negative common-mode protection at driver outputs. System has high common-mode voltage capability. SN75450 is dual peripheral driver for high-current switching at high speeds.- The Linear and Interface Circuits Data Book for Design Engineers, Texas Instruments, Dallas, TX, 1973, p8-78.   (View)

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SQUARE_LAW_OUTPUT

Published:2009/7/15 3:12:00 Author:Jessie

Diode network and detector provide output proportional to square of input voltage. Input range of 40 db is split into two 20-db segments. Each stage saturates and gives constant output for voltages above operating range. For voltages below operating range, stage is cut off and has zero output. Combination of two stages gives desired square-law characterisitic. Resistor values are: R1A, R3A a=3.18K,R1B＝57.9K, R3B＝18.75K, R5 ＝3K、R7＝10, R2A, R4B ＝5.06K, R4A ＝0.86K, R2B ＝64.2K,R6 ＝ 300 and R8, R9 ＝ 990．－R. J. Matheson, Square-Law Defector has 40-db Dynamic Range, Electronics, 39:18, p 95－97．   (View)

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FAST_SYNCHRONIZING

Published:2009/7/14 4:38:00 Author:May

Combination of phase splitter and DAC provides accurate synchronization of high-stability VCO with external reference frequency. IC divides reference frequency by 4 and provides two signals 90° apart, while IC2 divides VC0 frequency similarly by 4. Phase relationship between outputs of IC3 depends on whether VCO is higher or lower than reference, while frequency of IC3 outputs depends on difference between oscillator and reference frequencies, Schmitt triggers IC4 and IC5 supply clock and up/down control to counter IC6. If VC0 frequency is low, IC6 counts up at rate proportional to frequency difference and delivers increasing control voltage to VCO as required for increasing oscillator frequency.-H. W. Cooper, Oscillator Synchronizer Is Fast Acting, EDN Magazine, July 20, 1973, p 83-84.   (View)

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PHOTOELECTRIC__FUNCTION__GENERAIOR

Published:2009/7/15 3:11:00 Author:Jessie

Open-loop photoelectric function generator generates any single-value function With 1％accuracy, as required for duplicating particular antenna patterns in radar simulator. Uses horizontal sweep of 10 millisec (100 cps) with 5-kc vertical sweep.-B. Silverberg, Function Generator for Radar Simulator, Electronics, 32:2, p 52-55.   (View)

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STROBE_RATEMETER

Published:2009/7/14 4:38:00 Author:May

Flash role is metered by measuring mean charging current through capacitor supplied With constant-amplitude pulse voltage,－L. H. Barrett, New Circuit Improves Stroboscope Versatility, Electronics ,32:32,p 116－118.   (View)

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