Wednesday, February 9, 2011

Stereo Tone Control Circuit with Transistor

Stereo Tone Control Circuit with Transistor

Above diagram is the circuit diagram of stereo tone control which also available to buy in kit, you could possibly look for the kit at electronic part store close to your location. The tone control require 12v of power supply to work.

The circuit build based on ordinary tone control circuit, by using two transistors FCS9014 in each channel, so there are actually four transistors in this stereo audio tone control. Take a note that you should connect this circuit before the amplifier circuit. The output of tone control need to be connected towards the input of the amplifier. Any small signal NPN transistor for example BC547B, 2N3904, C828, or C945 might be applied to replace FCS9014 transistor.

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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