Circuit Diagram

SIMPLE_TIME_DELAY

Published:2009/6/25 21:15:00 Author:Jessie

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ACTIVE_INDUCTOR

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

An active inductor is realized with an eight-lead IC, two carbon resistors, and a small capacitor. A commercial inductor of 50 henries may occupy up to five cubic inches.   (View)

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AUDIO_OPERATED_RELAY

Published:2009/6/25 21:15:00 Author:Jessie

Q1 and Q2 are general purpose transis-tors. The 10 K input pot is adjusted to a point just short of where Q1 turns on as indicated by K pulling in. K is any 5 V reed relay. With the values shown for R (100 K) and C (47 μF), timing values from.05 to slightly over 5 sec-onds can be achieved. B shows the addition o f a 22 K series resistor to the 10 K input pot if a 12 V supply is used. A suitable 12 V reed relay must be used at K.   (View)

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SIMULATED_INDUCTOR

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

With a constant currentexcitation, the voltage dropped across an inductance increases with frequency. Thus, an active device whose output increases with frequency can be characterizedas an inductance. The circuit yields such a response with the effective inductance being equal to: L = R1R2C. The Q ofthis inductance depends upon RI being equal to R2.At the same time, however, the positive and negative feedback paths of the amplifier are equal leading to the distinct possibility of instability at high frequencies. R1 should, therefore, always be slightly smaller than R2 to assure stable operation.   (View)

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SOUND_EFFECT_GENERATOR

Published:2009/6/25 21:10:00 Author:May

This waveshape generator is basically a slow running oscillator with variable attack and decay. A variable amplitude (high impedance) output is available via the 2 M potentiometer. B shows an add-on circuit which should be used if a low impedance output is required. Some of the output waveforms that can be produced are shown in C.   (View)

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MUSICAL_CHIME_GENERATOR

Published:2009/6/25 21:09:00 Author:May

The circuit is that of a multiple feedback bandpass filter. A short click (pulse), makes it ring with a frequency which is its natural reso-nance frequency. Oscillations die away expo-nentially and closely resemble many naturally occuring percussive or plucked sounds. The higher the Q the longer the decay time constant. H igh frequencyre sonance s re semble chimes, lower frequencies sound like claves or bongos. Several circuits, all with different tuning, driven by pulses from a rhythm generator can produce an interesting pattern of sounds.   (View)

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LONG_DURATION_TIME_DELAY

Published:2009/6/25 21:14:00 Author:Jessie

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LONG_DELAY_TIMER_USING_PUT

Published:2009/6/25 21:09:00 Author:May

Circuit NotesThe PUT is used as both a timing element and sampling oscillator. A low leakage film capacitor is required for C2 due to the low current supplied to it.   (View)

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SHIFT_REGISTER_DRIVER

Published:2009/6/25 21:14:00 Author:Jessie

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:Jessie

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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VOICE_ACTIVATED_SWITCH_AND_AMPLIFIER

Published:2009/6/25 21:14:00 Author:Jessie

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VIDEO_AMPLIFIER

Published:2009/6/25 21:13:00 Author:Jessie

AGC capability of Motorola MC1590G makes h highly suitable for wideband video amplifier applications. Voltage gain is about 25 dB up to 50 MHz for 100-ohm load and 45 dB up to 10 MHz for 1K load. Several circuits can be cascaded to increase gain, using capacitive coupling.-B. Trout, A High Gain Inte-grated Circuit RF-IF Amplifier with Wide Range AGC, Motorola, Phoenix, AZ, 1975, AN-513, p9.   (View)

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HIGH_VOLTAGE_BUFFER

Published:2009/6/25 21:13:00 Author:Jessie

Circuit shown for μA723 voltage regulator permits use as highvoltage and high－current buffer in linear applications，Power dissipation of output transistor Q3 is only Iimiting factor，I1 is proportionalto VIN、I2 is proportional to I1, and output voltage Vo is proportional to I2 and VIN.-G. Niu, Single Op Amp Implements High-Voltage/Current Buffer, EDNMagazine, Oct 5, 1977, p 96 and 98   (View)

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CAPACITANCE_MULTIPLIER

Published:2009/6/25 21:09:00 Author:May

This circuit can be used to simulate large capacitances using small value components. With the values shown and C = 10 μF, an effective capacitance of 10,000 μF was obtained. The Q available is limited by the effective series resistance. So R1 should be as large as practical   (View)

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TONE_BURST_GENERATOR

Published:2009/6/25 21:09:00 Author:May

The first timer is used as a monostable and determines the tone duration when triggered by a positive pulse at pin 6. The second timer is enabled by the high output of the monostable. It is connected as an astable and determines the frequency of the tone.   (View)

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LASER_DIODE_PULSER

Published:2009/6/25 21:08:00 Author:May

This drive is capable of driving the laser diode with 10 ampere, 20 ns pulses. For a 0.1% duty cycle, the repetition rate will be 50 kHz. A complementary emitter-follower is used as a driver. Switching speed is determined by the ft of the bipolar transistors used and the impedance of the drive source.   (View)

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DOOR_CHIMES_DELAY

Published:2009/6/25 21:06:00 Author:May

Circuit NotesWith values shown, this simple circuit will permit one operation every 10 seconds or so.Capacitor C1 charges through RI when the button is released. Making RI larger crease the delay.   (View)

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FOUR_CHANNEL_SYNTHESIZER

Published:2009/6/25 21:05:00 Author:May

This circuit will synthesize two rear chan-nels for quadraphonic sound when fed with a stereo signal. The rear output for the left chan-nel, is a combination of the left channel input 180 out of phase, added to a proportion of the right hand channel (also out of phase). The right hand rear output is obtained in a similar way.   (View)

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MICROMETRONOME

Published:2009/6/25 21:04:00 Author:May

This compact metronome will run for years on a single nine-volt transistor battery.Has both tone and pulse rate controls, and uses touch plates to start and stop, can be built in a case no larger than a pack of cigarettes. The touch plates consist of two strips of metal about 1/16-inch apart mounted on, but insulated from, the case. Bridging the gap closes the switch.   (View)

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STEREO_REVERB_SYSTEM

Published:2009/6/25 21:04:00 Author:May

The LM378 dual power amplifier is used as the spring driver. The recovery amplifier is a low noise dual preamplifier. Mixing of the delayed signal with the original is done with another LM387 used in an inverting summing configuration.   (View)

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