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 […]
Audio and Amplifier Projects
Loudspeaker Thump Sound Eliminator Circuit
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 […]
Bridged Amplifier Circuit using LM380 Circuit
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 […]
Bench Amplifier Circuit
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 […]
Public Address (PA) Amplifier Circuit
A public address system (PA system) is an electronic system that includes a set of audio electronic devices such as microphones, amplifiers, loudspeakers, and other similar audio equipment. It is designed to boost the volume of a human speech, or a musical source, or some other audible sound input to an amplified version through an […]
60 Watt Amplifier Circuit
The circuit of a 60 watt power amplifier is shown in the below figure. It’s design layout is simple and very conventional. It has a completely symmetrical pattern which has one pole frequency compensation, yet some uncommon methods have been employed in order to keep the number of parts less. To start with, the configuration […]