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how to build an audio amp of 20watts with pre amp to play electric violin with piezo mic? Answered


Google "lm 3886 amp"

The 3886 is a chip amp that needs few parts and is settable for up to 68 amps output. Most people set if for 30 or so.

There are many schematics available and even lots of kits with printed circuits and other parts.

Any amp suggested as a guitar amp or harp amp would be very suitable for your use with piezo mic.