Wednesday, November 19, 2014

250 milliwatts Amplifier with TDA2822

This is 250 milliwatts amplifier scheme design with TDA2822. This low power amplifier generates 250 mW on each channel, can be used for general purposed application such as walkman, mp3 player, radio etc. This may well configured to operate in stereo or bridge, which is obtained more power in mono channel.

It is also ideal for use as a preamp in high power amplifiers. It can be supplied with 3 to 6 volts and 500 milliamps, without detracting from the quality of sound. It is useful to replace portable radios and amplifiers of gaming gadgets.

List of components:
R1, R2: 10 KΩ
R3, R4: 4.7 KΩ
C1, C2, C3: 10 uF. electrolytic capacitors
C5, C5: 1000 uF. electrolytic capacitors.
C6, C7: 0.1 uF. ceramic capacitors.
IC1: TDA2822
B1: four 1.5 volt batteries or a power supply 6 volts.
LS1, LS2: Speakers or 4 Ω speakers.

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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