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CONTINUITY_TESTER

Published:2009-7-10 4:23:00 Author:May

CONTINUITY_TESTER
Using a comparator, this continuity tester applies only about 300mV to the circuit to be tested. This avoids false readings in semiconductor circuits.   (View)

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01_24V_AT_1A

Published:2009-7-19 19:55:00 Author:Jessie

01_24V_AT_1A
High4mpedance reference-voltage divider across 30-V supply serves CA3140 connected as noninverting power opamp with gain of 3.2. 8-V reference input gives maximum output voltage of about 25V. D2201 high-speed diode serves as current sensor for 2N2102 current-limit sensing amplifier. Current-limiting point can be adjusted over range of 10 mA to 1 A with single 1k pot. Power Darlington serves as series-pass element.- Linear Integrated Circuits and MOS/FET's, RCA Solid State Division, Somerville, NJ, 1977, p 248-256.   (View)

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ZENER_NOISE_GENERATOR

Published:2009-7-17 23:05:00 Author:Jessie

ZENER_NOISE_GENERATOR
Amplifies noise voltage developed across conducting zener diode. Zener current is fed to base of transistor, which has nominal current gain of 75.-G. Richwell, One-Stage Semiconductor Noise Generator, EEE, 12:7, p 26-28.   (View)

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RMS_CONVERTER

Published:2009-7-10 4:23:00 Author:May

RMS_CONVERTER
RMS_CONVERTER

Converts analog voltage to RMS equivalent by squaring operation followed by integration and squarerooting. Bipolar input signal is first converted into linear absolute value with Optical Electronics 9004 absolutevalue module, as required for processing by 5904 unipolar devices. Pots are used to establish 10-V full-scale level.R1C1is integration time constant.- Simple RMS Converter, Optical Electronics, Tucson, AZ, Application Tip 10246.   (View)

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BACKGROUND_NOISE_SUPPRESSOR

Published:2009-7-17 23:04:00 Author:Jessie

BACKGROUND_NOISE_SUPPRESSOR
With control set for maximum resistance, only desired a-c voltage peaks above 4.5 V are passed by diodes. Balanced variable-thresh-old circuit achieves this suppression of weak background noise without affecting a-c balance of signals.-W. E. Earle, A-C Threshold Converts to Switch, Electronics, 31;1, p 96-99.   (View)

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SIMPLE_VARIABLE_FREQUENCY_SQUARE_WAVE_GENERATOR

Published:2009-7-10 4:23:00 Author:May

SIMPLE_VARIABLE_FREQUENCY_SQUARE_WAVE_GENERATOR
A CD4046B PLL is used as a simple generator.The range is 200 Hz to 2 kHz, but it can be changed by changing C1.   (View)

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4_DECADE_SQUARE_WAVE_GENERATOR

Published:2009-7-10 4:21:00 Author:May

4_DECADE_SQUARE_WAVE_GENERATOR
This circuit will generate a square wave of 2 Hz to 20 kHz. The circuit uses an op amp in a relaxation-oscillator configuration. The output is about 15 VPP. R1 through.R4. are calibrols for the four frequency ranges, as selected by S1-a and 51-b. R10 adjusts the output level.   (View)

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AC_COUPLED_JFET_

Published:2009-7-10 4:19:00 Author:May

AC_COUPLED_JFET_
Use of C1 as Miller integrator or capacitance multiplier allows simple circuit to handle very long time constant while providing high voltage gain. Circuit also offers low distortion with low noise and high dynamic range.- FET Databook, National Semiconductor, Santa Clara, CA, 1977, p 6-26.   (View)

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GATE_CAPACITOR_PROTECTS_SCS_AGAINSTRFI

Published:2009-7-17 23:03:00 Author:Jessie

GATE_CAPACITOR_PROTECTS_SCS_AGAINSTRFI
Capacitor between gate and cathode provides shunt path at higher frequencies to prevent firing of silicon controlled switch by r-f interference. Values in circuit will give protection from 32-V signals between 100 kc and 30 Mc. –R. J. Sanford, Can RFI Control Prevent Weapons Failures?, Electronics, 36:45, p 43-45.   (View)

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SOUND_METER_RECTIFIER

Published:2009-7-17 23:02:00 Author:Jessie

SOUND_METER_RECTIFIER
Used with sound level meter to provide indication proportional to rms value of wideband noise, in two-segment linear approximation to required square-law characteristic.-W. V. Richings and B. J. White, Transistorized Sound Level Meter, Electronics, 33:25, p 64-66.   (View)

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SQUELCH_FOR_MOBILE

Published:2009-7-17 23:02:00 Author:Jessie

SQUELCH_FOR_MOBILE
Reduces background noise, to prevent operator fatigue during no-signal periods. Double-action squelch is obtained by using negative voltoge at first limiter grid during signal periods to cut off 12AD6 noise amplifier.-C. Gonzalez and R. J. Nelson, Design of Mobile Receivers with Low-Plate-Potential Tubes, Electronics, 33:34, p 62-65.   (View)

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SQUELCH_FOR_DOUBLE_SUPERHET

Published:2009-7-17 22:42:00 Author:Jessie

SQUELCH_FOR_DOUBLE_SUPERHET
Carrieroperated squelch level is automatically adjusted to best compromise for incoming signal. Squelch can be adjusted to open on 0.5-microvolt input signal while remaining closed when subject to full output of noise generator-J. M. Tewksbury, Receiver Squelch Control Uses Double Superheterodyne, Electronics, 35:3, p 44-46.   (View)

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SCR_NOISE_SUPPRESSOR

Published:2009-7-17 22:40:00 Author:Jessie

SCR_NOISE_SUPPRESSOR
Used to suppress circuit noise generated when scr is switched on, without materially affecting power-handling capacity or efficiency. Load shown is d-c series motor.-Noise Reducer for SCR, EEE, 10:10, p 94.   (View)

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A_F_AMPLIFIER_WITH_SQUELCH_2

Published:2009-7-17 22:40:00 Author:Jessie

A_F_AMPLIFIER_WITH_SQUELCH_2
Used to make first audio stage inoperative during no-signal condition in communication receiver.-NBS, Handbook Preferred Circuits Navy Aeronautical Electronic Equipment, Vol. 1, Electron Tube Circuits, 1963, p N12-2.   (View)

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A_F_AMPLIFIER_WITH_SQUELCH_1

Published:2009-7-17 22:39:00 Author:Jessie

A_F_AMPLIFIER_WITH_SQUELCH_1
Input is obained from noise rectifier and amplifier of communication receiver. Squelch is used to make first audio stage inoperative during no-signal condition.-NBS, Handbook Preferred Circuits Navy Aeronautical Electronic Equipment, Vol, 1, Electron Tube Circuits, 1963, p N12-2.   (View)

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SOUND_LEVEL_METER

Published:2009-7-17 22:26:00 Author:Jessie

SOUND_LEVEL_METER
Two-transistor circuit takes high-impedance microphone feeding compound grounded-collector stage in which collector, emitter load, and biased resistor of Q1 are bootstrapped.-W. V Richings and B. J. White, Transistorized Sound Level Meter, Electronic, 33:25, p 64-66.   (View)

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A_F_AMPLIFIER_WITH_SQUELCH

Published:2009-7-17 22:20:00 Author:Jessie

A_F_AMPLIFIER_WITH_SQUELCH
Used to make first audio stage inoperative during no-signal condition in communication receiver.-NBS, Handbook Preferred Circuits Navy Aeronautical Electronic Equipment, Vol. 1, Electron Tube Circuits, 1963, p N12-2.   (View)

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200_MC_POST_AMPLIFIER_FOR_NOISE_FIGURE_METER

Published:2009-7-17 22:19:00 Author:Jessie

200_MC_POST_AMPLIFIER_FOR_NOISE_FIGURE_METER
Cascaded common-base connection of germanium mesa transistors gives power gain of 40 db, bandwidth of 25 MC, and a noise figure of 3 db. Used between test jig and Hewlett-Packard 342A noise figure meter for measuring noise figure of transistor at 200 Mc. –Texas Instruments Inc., Solid-State Communications, McGraw-Hill, N. Y., 1966, p 345.   (View)

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RANDOM_NOISE_GENERATOR

Published:2009-7-17 22:05:00 Author:Jessie

RANDOM_NOISE_GENERATOR
Uses thyratron in magnetic field as basic noise source, to provide azimuth and elevation drive signals for missile radar that simulale actual tracking conditions. Eliminates need for expensive test drones in evaluating missile performance. –C. E. Hendrix, Target Simulator Tests Beam-Rider Missiles, Electronics, 31:5, p 32-35.   (View)

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MULTIMETER_SHUNT

Published:2009-7-10 4:19:00 Author:May

MULTIMETER_SHUNT
The current range in multimeters, particularly the more inexpensive ones, is restricted by the load limits of the internal shunts to 1 to 2 A. The figure shows how easily a precision heavy-duty resistor from Dale or RCL (0.1Ω;20W;1%) can be used as an external shunt.These resistors were not designed for this purnose, but they are much cheaper than custom-made shunt resistors. The 20-W rating applies only, by the way, if a heatsink is used: without that its rating is only 8W. The maximum current through the device on a heatsink is about 14A;the larger versions draw up to 17.5A.When mounting the shunt, make sure that the test terminals (as well as the device terminals) are soldered properly, otherwise the resistance of the terminals is added to the shunt.   (View)

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