Monday, April 18, 2011

STK4231II, Stereo Amplifier 2x100 Watts

Do you want to make a simple amplifier, but has ability to deliver very high audio power output? If true, then the circuit is the answer for you. This circuit built using an IC for each channel, so you need two power ICs of STK4231II to make a stereo amplifier circuit.

STK4231II, Stereo Amplifier 2x100 Watts circuit

Each IC will deliver audio power output about 100W, so we can call this circuit as a 2x90W stereo power amplifier. This circuit must be supplied by using a dual polarity power supply and you have to install the heatsink on each IC to avoid overheating.

Download STK4231II datasheet:
Download Link

About Audio Amplifier
An audio amplifier is an electronic amplifier that amplifies low-power audio signals (signals composed primarily of frequencies between 20 - 20 000 Hz, the human range of hearing) to a level suitable for driving loudspeakers and is the final stage in a typical audio playback chain.

The preceding stages in such a chain are low power audio amplifiers which perform tasks like pre-amplification, equalization, tone control, mixing/effects, or audio sources like record players, CD players, and cassette players. Most audio amplifiers require these low-level inputs to adhere to line levels.

While the input signal to an audio amplifier may measure only a few hundred microwatts, its output may be tens, hundreds, or thousands of watts. More explanation about power audio amplifier can be found at

This is a video tutorial about how to a very simple audio amplifier based on the LM386 amplifier chip. It can be built for less than $20 (or might be less than $8 in some countries) and used to amplify any low level audio signal including a guitar, bass or mp3 player.

Watch the video:

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