Analog Circuit

SUPERHET_FRONT_END

Published:2009/6/24 4:36:00 Author:May

This superhet receiver front end is simple and uses an NE602 followed by an MC1350 IF amplifier.   (View)

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CAPACITOR_DISCHARGE_IGNITION_SYSTEM

Published:2009/6/24 4:22:00 Author:May

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DIFFERENTIAL_THERMOMETER

Published:2009/6/24 4:18:00 Author:May

The differential thermometer shown in the figure produces an output voltage which is proportional to the temperature difference between two sensors. This is accomplished by using a dif-ference amplifier to subtract the sensor outputs from one another and then multiplying the differ-ence by a factor of 10 to provide a single-ended output of 100 mV per degree of differential tem-perature.   (View)

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UNIVERSAL_WIPER_DELAY

Published:2009/6/24 4:04:00 Author:May

IC1 is connected in the astable mode, driving RLA. C3, Dl, and D2 prevent spikes from the relay coil and the wiper motor from triggering IC1. VR2 is adjusted to give the minimum delay time required. VR1 is the main delay control and provides a range of from about 1 second to 20 seconds. SW1 is an over-ride switch to hold RLA permanently on (for normal wiper operation). The relay should have a resistance of at least 150 ohms and have heavy duty contacts. The suppression circuit may be needed for the protection of IC1.   (View)

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VARIABLE_SENSITIVITY_PHOTOTRANSISTOR_CIRCUIT

Published:2009/6/24 4:00:00 Author:May

A variable resistor is used to vary the light-level response of a phototransistor. Phototransistors are more light sensitive than photodiodes, but they generally have poorer frequency response.   (View)

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GASOLINE_ENGINE_TACHOMETER

Published:2009/6/24 3:59:00 Author:May

This tachometer can be set up for any number of cylinders by linking the appropriate timing resistor as illustrated. A 500 ohm trim resistor can be used to set up final calibration.A protection circuit composed of a 10 ohm resistor and a zener diode is also shown as a safety precaution against the transients which are to be found in automobiles.   (View)

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ASTABLE_MULTIVIBRATOR

Published:2009/6/24 3:49:00 Author:May

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ASTABLE_WITH_VARIABLE_PULSE_WIDTH

Published:2009/6/24 3:44:00 Author:May

This produces a positive variable width pulse and has a symmetry control. R1 and R2 control the pulse width and symmetry.   (View)

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DISC_TAPE_PHASE_MODULATED_READBACK_SYSTEMS

Published:2009/6/24 3:44:00 Author:May

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PHONE_LINE_SIMULATOR

Published:2009/6/24 3:44:00 Author:May

This device contains a ringing generator and a tone oscillator. The tone oscillator is set to either 350 or 440 Hz. The ringing generator is a potted module delivering 86 Vac at 20 Hz. It is available from a source listed in the reference.   (View)

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ASTABLE

Published:2009/6/24 3:41:00 Author:May

At the instant that power is applied to the 555 astable, timing capacitor C1 is initially discharged, causing the output of the chip output at pin 3 to be high. Once C1 has charged to about 2/3 of the supply voltage, its output goes low, and the discharge transistor turns on, draining the charge on C1.   (View)

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TELEPHONE_AUDIO_INTERFACE

Published:2009/6/24 3:39:00 Author:May

The telephone audio interface-essentially, a simple isolation/couple circuit-isolates the phone line from any connected audio circuit without presenting any danger to the phone line, the equip-rnent, or the user.   (View)

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BISTABLE_MULTIVIBRATOR

Published:2009/6/24 3:38:00 Author:May

Positive feedback is provided by resistor R4, which causes the latching. A positive pulse at the set input causes the output to go high and a reset positive pulse will return the output to es-sentially 0 Vdc.   (View)

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BELL_SYSTEM_202_DATA_ENCODER

Published:2009/6/24 3:38:00 Author:May

The AD537 is well-suited for frequency-shift modulator and demodulator applications. Requir-ing little power, it is especially appropriate for using phone-line power. The Bell-System 202 data en-coder shown here delivers the mark frequency of 1.2 kHz with the data input low. When the input goes high, the timing current increases to 165 μA and generates the space frequency of 2.2 kHz. The trim shown provides a ±10% range of frequency adjustment. The output goes to the required band-pass filter before transmission over a public telephone line. A complementary demodulator is easy to implement.   (View)

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ASTABLE_MULTIVIBRATOR_WITH_STARTING_NETWORK

Published:2009/6/24 3:35:00 Author:May

This circuit will start with a slowly rising supply voltage waveform.   (View)

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TELEPHONE_CALL_RESTRICTOR

Published:2009/6/24 3:34:00 Author:May

This circuit is designed to restrict phone calls with the area codes: 900, 976, and 540. This device uses a microcontroller to compare the DTMF decoded tones with telephone numbers stored in EEP-ROM (IC3). This device requires a programmed microcontroller. Software and details of program-ming can be found in the original magazine article.   (View)

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CALLER_ID_CIRCUIT

Published:2009/6/24 3:33:00 Author:May

This circuit requires programming of the microcontroller. Software information is available from the reference in the original article.   (View)

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PHOTORECEIVER_OPTIMIZED_FOR_NOISE_AND_RESPONSE

Published:2009/6/24 3:28:00 Author:May

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SYNCHRONIZER_CIRCUIT

Published:2009/6/24 3:28:00 Author:May

This common synchronization method uses two rippled 74LS74 D-type flip-flops.   (View)

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SYNC_TIP_dc_RESTORER

Published:2009/6/24 3:26:00 Author:May

The dc restorer shown supplies a video signal with sync tips clamped to a baseline level. Clamp drive signal is supplied from elsewhere, usually a sync generator or a sync separator.   (View)

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