Circuit Diagram

LONG_DURATION_TIME_DELAY

Published:2009-6-25 21:14:00 Author:May

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SHIFT_REGISTER_DRIVER

Published:2009-6-25 21:14:00 Author:May

A 16 V power supply can be synthesized as shown using IN1692 rectifiers. A shift pulse input saturates the 2N2714 depriving the Darlington combination (2N2714 and 2N2868) of base drive. The negative pulse so generated on the 15 V line is differentiated to produce a positive trigger pulse at its trailing edge.   (View)

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WIDEBAND_VARIABLE_GAIN

Published:2009-6-25 21:14:00 Author:May

FET selves as ourPur gain-controlled device in feedback loop of Optical Electronics 9906 opamp. Resistive T network has SD201 MOS transistor as ground leg, with resistor values dlosen so transistor is electrically dose to summing junction, automatically limiting total signal voltage. Resulting arrangement of voltage-controlled feedback and compensation gives variable-gain amplifier whh good linearity and constant wideband width for all gain Ievels.- Wideband Variable Gain Amplifier, Optical Electronics, Tucson, AZ, Application Tip 10277.   (View)

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1_36_MHz_DISTRIBUTED

Published:2009-6-25 21:23:00 Author:Jessie

ProvkIes 18-dB gain over entire frequency range without use of special ferrite transformers, Gain contribution of each transistor, in phase with amplified wave as it passes down artificial transmission line, adds to that of other transistors. Capacitors marked with asterisks are lowinductance ceramic types such as Efie Redcap. Delay-line inductors L are 12 turns No.24 closewound on 1/8-inch diameter Lucite rod, and L/2 units are 7 turns. Can be used as preamp for frequency counter and as auxiliary for other test equipment. Article covers construction, heatsinking of transistor, and testing.-H. Olson, WidRange Broadband Amplifier, Ham Radio, April 1974, p 40-44.   (View)

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TTL_OSCILLATOR

Published:2009-6-25 21:23:00 Author:Jessie

TTL inverter stages, U1 and U2, are cross-connected with a crystal Y1. A resistor in each stage biases the normally digital gates into a region where they operate as amplifiers. Inverter stage U3 is used as a buffer.   (View)

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BIAS_SUPPLY_FOR_CLASS_AB

Published:2009-6-25 21:23:00 Author:Jessie

Two-transistor supply using PNP silicon transistor as amplified diode variable-voltage source gives improved-performance transistor RF power amplifier op-erating in class AB Iinear mode. Transistor types are not critical, Output impedance of bias source is about 1 ohm, and output voltage changes only up to 3 1/2 for ±2.5 V change in input voltage Vcc.-C. P, Bartram, Bias Supply for R,F. Power Amplifiers, Wireless World, April 1976,p61.   (View)

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1_kHz_SQUARE_WAVE_OSCILLATOR

Published:2009-6-25 21:22:00 Author:Jessie

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R_C_OSCILLATOR

Published:2009-6-25 21:21:00 Author:Jessie

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FOUR_CHANNEL_DATA_ACQUlSITION_SYSTEM

Published:2009-6-25 21:20:00 Author:Jessie

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SIREN_SPACE_WAR_PHASQR_GUN

Published:2009-6-25 21:13:00 Author:May

The one shot and decay functions could be added to make an ideal phasor gun sound.   (View)

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STEREO_REVERB_ENHANCEMENT_SYSTEM

Published:2009-6-25 21:12:00 Author:May

The system can be used to synthesize a stereo effect from a monaural source such as AM radio or FM-mono broadcast, or it can be added to an existing stereo (or quad) system where it produces an exciting opening up special effect that is truly impressive.   (View)

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TRIAC_TRIGGER

Published:2009-6-25 21:21:00 Author:Jessie

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POSITIVE_INPUT／NEGATIVE_OUTPUT_CHARGE_PUMP

Published:2009-6-25 21:12:00 Author:May

A simple means of generating a low-power voltage supply of opposite polarity from the main supply. Self oscillating driver produces pulses at a repetition frequency of 100 kHz.When the VMOS device is off, capacitor C is charged to the positive supply. When the VMOS transistor switches on, C delivers a negative voltage through the series diode to the output. The zener serves as a dissipative regulator.   (View)

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SOUND_OPERATED_TWO_WAY_SWITCH

Published:2009-6-25 21:20:00 Author:Jessie

This circuit operates a relay each time a sound of sufficient intensity is made, thus one clap of the hands will switch it one way, a second clap will revert the circuit to the origi-nal condition. Q2 and Q3 form a Schmitt trigger. TheJK flip-flop is used as a bistable whose output changes state every time a pulse is applied to the clock input (pin 12). Q4 allows the output to drive a relay.   (View)

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ULTRA_PRECISE_LONG_TIME_DELAY_RELAY

Published:2009-6-25 21:12:00 Author:May

Circuit NotesPredictable time delays from as low as 0.3 milliseconds to over 3 minutes are obtainable without resorting to a large value electrolytic-type timing capacitor. Instead, a stable low leakage paper or mylar capacitor is used and the peak point urrent of the timing UJT (Q1) is effectively reduced, so that a large value emit-ter resistor (R1) may be substituted.   (View)

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POSITIVE_EDGE_DIFFERENTIATOR

Published:2009-6-25 21:19:00 Author:Jessie

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200_MHz_CASCODE

Published:2009-6-25 21:12:00 Author:May

JFETs give low cross modulation, large signal-handling ability, and AGC action controlledby biasing upper cascode JFET. Neutralization is not needed.- FET Databook, National Semiconductor, Santa Clara, CA, 1977, p 6-26-6-36.   (View)

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FET_BIPOLAR_SOURCE_FOLLOWER

Published:2009-6-25 21:12:00 Author:May

Used where source follower with high output-voltage swing and voltage gain close to unity is re-quired. Circuit has constant-current bias supply.Combination of unipolar and bipolar transistors gives desirable amplifying features of each solid-state device,-I. M. Gottlieb, A New Look at Solid-State Amplifiers, Ham Radio, Feb. 1976, p16-19.   (View)

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PROGRAMMABLE_BIRD_SOUNDS

Published:2009-6-25 21:11:00 Author:May

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CASCODE

Published:2009-6-25 21:16:00 Author:Jessie

Combination of unipolar and bipolartransistors gives desirable amplifying fea-tures of each solid-state device. Ideal for use whh tuned circuits in audio, video, IF, and RF applications.-I. M. Gottlieb, A New Look at Solid-State Amplifiers, Ham fladio, Feb. 1976, p16-19.   (View)

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