This article is written with an intent to build a simple 20 Watt Amplifier. All the amplifier circuits presented below will provide a full output power of 20 watts into 8 Ohm loudspeaker. By: Dhrubajyoti Biswas Why a Single Ended Class-A Amplifier A single-ended Class-A amplifier is probably one of the best example when it […]
Audio and Amplifier Projects
LM4862 Amplifier Circuit – A Better LM386 Alternative
The LM386 based amplifier is still very popular as one of the smallest sized amplifier chips. However, the LM386 is not perfect and has a few drawbacks and limitations. As shown below, the LM386 works with large electrolytic capacitors, which makes it bulkier and costlier, and causes it to be prone to distortions with age. […]
70 Watt Stereo Amplifier Circuit
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 […]
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 […]
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 […]
5 Watt Stereo Amplifier Circuit with Bass Treble Controls
A complete, self-contained, small and compact Hi-Fi stereo amplifier circuit with bass, treble, volume control is presented in the following article. This small compact stereo amplifier can be used for amplifying music from mobile phones, computer USB, Ipod or any source capable of producing as low as 50 millivolt signal. Due to the high bass […]