Sunday, June 5, 2011

68W Power Amplifier Circuit based LM3886

The following diagram is a 68W Power Amplifier Circuit diagram based on famous amplifier chip LM3886.

electronic circuit diagram

Components List:
R1 = 10K Ohms
R2 = 10 Ohms 2W see text
R3 = 10 Ohms
R4 = 47K Ohms
R5 = 220K Ohms
R6 = 10K Ohms
R7 = 100K Ohms
L1 0,7uH
IC1 LM3886
C1 = 100NF
C2 = 100NF
C3 = 100NF
C4 = 100UF
C5 = 100UF
C6 = 4,7UF
C7 = 100UF
C8 = 1UF

Amplifier should be fed by source symmetrical good filtered of + 34 and – 34 volts. R2 and L1 is a resistor of 10 ohms / 2watt coiled with 10 to 12 you exhale of enameled thread AWG 20. The circuit integrated lm3886 is a component easy of being found at the electronics stores, for that he is used in several projects of potency audio, some exist circuits with linked lm3886 in bridges for potencies of up to 150 watts. For most information on the assembly of that circuit, please read the datasheet of the LM3886. With the information of the leaf of data you can adapt the circuit with LM3886 your needs.

68W Power Amplifier Circuit

Circuit Source:

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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