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Audio and Amplifier Projects

Bench Amplifier Circuit

Last Updated on January 5, 2023 by Swagatam 2 Comments

bench amplifier circuit compressed

A bench amplifier is a small test amplifier which includes basically all the features that are required for testing the performance of an input audio signal. It can be also customized as per the specifications of the input signal, so that you don’t have to build different sets of amplifiers for different test purposes. A […]

Filed Under: Audio and Amplifier Projects Tagged With: Amplifier, Bench

Two Tone Door Bell Circuit

Last Updated on November 15, 2023 by Swagatam Leave a Comment

two tone door bell circuit compressed

The electronic 2 tone door bell circuit is designed around the popular IC 555. The IC 555 is extensively applied in numerous varieties of timers and also as a basic oscillator circuit. In this particular project both the timer and the oscillator functions of the IC are utilized. As soon as the indicated push-button is […]

Filed Under: Audio and Amplifier Projects, Home Electrical Circuits Tagged With: Bell, Door, Tone

Bridged Amplifier Circuit using LM380 Circuit

Last Updated on January 5, 2023 by Swagatam 1 Comment

bridged amplifier circuit using LM380 compressed

In this post I have explained how to configure a couple of LM380 ICs in the bridged format to create an output power that’s two times more or double of a single IC amplifier. When two identical amplifier circuits are configured such that the loudspeaker operates at the center in a push pull manner, between […]

Filed Under: Audio and Amplifier Projects Tagged With: Amplifier, Bridged, LM380

Loudspeaker Thump Sound Eliminator Circuit

Last Updated on January 2, 2024 by Swagatam 6 Comments

speaker thump sound eliminator compressed

While using amplifiers, we sometimes experience this very annoying thump sound, popping up in loudspeakers whenever the amplifier is switched ON or OFF. This normally happens with amplifiers that are of low quality or lack the feature of a thump eliminator circuit built-in in the amplifier. The thump sound in loudspeakers can be not only […]

Filed Under: Audio and Amplifier Projects Tagged With: Eliminator, Loudspeaker, Sound, Thump

70 Watt Stereo Amplifier Circuit

Last Updated on January 5, 2023 by Swagatam 9 Comments

70 watt stereo amplifier circuit compressed

In this post I have explained how to build a simple 70 + 70 watt stereo power amplifier circuit using transistors. The entire design along with power supply and PCB layouts are provided in the following article. Circuit Description The working of the proposed 70 watt stereo amplifier circuit can be understood from the following […]

Filed Under: Audio and Amplifier Projects Tagged With: Amplifier, Stereo, Watt

Tuned Radio Frequency (TRF) Receiver Circuits

Last Updated on June 20, 2025 by Swagatam 13 Comments

hiw to wind Li and L2 compressed

A tuned radio frequency receiver (or TRF receiver) is a form of radio receiver which is made using a number of tuned radio frequency (RF) amplifier stages accompanied by a detector (demodulator) circuit to draw out the audio signal, along with an audio frequency amplifier for amplifying the extracted audio into a loudspeaker. This kind […]

Filed Under: Audio and Amplifier Projects Tagged With: Circuits, Frequency, Radio, Receiver, TRF, Tuned

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