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Sound Operated Music Bell
Sometimes ringing the bell manually becomes difficult, especially when you are holding something in your hands. The sound-operated music bell takes care of the problem In this circuit, the use of an e...
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Solid state voltage indicator with high voltage cutout
Voltage fluctuations in the mains are very common phenomenon. These fluctuations can cause heavy damage to costly electronics and electrical gadgets operating for long period of time. For such purpose...
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Single Chip Dice
A circuit for electronics dice is already published in www.electronicsproject.org. Here is single chip version (of course CMOS) of the same which offers touch switch facility. Internal oscillator of I...
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Power Supply Resumption Alarm
Here is an audio annunciator which can be useful in factories, industries, auditoriums, and theatres etc where generator is used when power fails. It produces an alarm for a predetermined time when po...
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Low-cost Touch Sensitive Switch
While experiment with a high gain transistor it may be noticed the transistor gets saturated by just touching its base. Here is a single, low-cost touch switch based on this idea. The 50Hz hum present...
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Electronics Lucky Number
The circuit is simple and self explanatory. IC1, a NE555 timer, is used as astable mode to generate clock pulses at a rate of about 20 Hz. The frequency can be varied with the help of potentiometer VR...
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AM Transmitter
Here Is a low-cost, good-stability RF / Am transmitter which uses only one FET. Circuit Description The heart of this circuit is a FET BFW10 (T1) which works as a feedback oscillator. The frequency of...
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Crystal Tester
Most electronics project working with high frequency utilizes crystal in order to generate frequency as oscillator. It is used instead of coil. Coil can be checked with multi-meter if there is any fau...
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Flashing Light with twilight switch
Flashing light is very useful in order to indicate any obstruction or working in progress. The project automatic flashing light with twilight switch flash light in dark but during day it automatically...
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Pressure based Hit Switch
This versatile hit switch is the electronics equivalent of a conventional switch. It can be used to control the switching of a variety of electronic devices. The circuit of the hit switch uses a piez...
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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 De...
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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. Tra ......
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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 p...
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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 a...
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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 th...
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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 th...
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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 noi...
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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 ca...
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