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Simple Frequency Meter
Here is a simple frequency meter with which input frequency can be determined by simply measuring the values of two resistors and a little bit of computation. A retriggerable monistable multivibrator...
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Simple low/high voltage cut circuit
Various safety circuit (low/high voltage cut) using IC is already published in www.electronicsproject.org. Now, here is very simple low/high voltage cut circuit using only two transistors. Circuit...
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Simple Pulse Generator
This circuit is used to provide positive going pulses. The pulse width varies from 10µs to 100 ms at the rate of 20 pulses per second to 1 pulse per second and adjusted by a 1 MΩ potentiometer....
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Sound Operated Timer
Several timer circuit have been published in www.electronicsproject.org, but this is a unique timer circuit with no timer IC in use. It is transistorized timer having a 2-stage audio amplifier and a...
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Stabilized Power Supply With Short-Circuit Indication
Here is an efficient 4-stage stabilized power supply unit for testing electronics circuits. It provides well regulated and stabilized output, which is essential for most electronics circuits to give...
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Touch operated Band switch for Radio Set
Touch switch are now in vogue for stereo decks and other audio and video sets. This small circuit is meant for electronics enthusiasts to help them covert the manual bandswitch of their radio set to an...
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Traffic Light Controller
The circuit given here is substitute of old mechanical traffic-light controllers which are not reliable. The circuit’s timing and sequential operation are done by two CMOS ICs (IC1 and IC2) while the...
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Universal Battery Tester
To recognize the battery whether it is working or not is very difficult. Generally voltmeter is employed for checking purpose of state of battery. Now, here is very simple circuit utilized to check the...
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White / LF Noise Generator
Every musician today is in need of a noise source, particularly those who practice with a group or use a synthesizer. The white noise generator gives an output to be fed to an amplifier. The white...
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Wind Sound Generator
Using this simple circuit, one can generate the sound of wind. The circuit is basically an astable multivibrator build around two NPN transistors. By adjusting the 1M potentiometer (VR1), the sound can...
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