Sunday, October 12, 2014

LM386 Audio amplifier

It is long time since I did anything in analog circuits, so this weekend was spent in analog circuits.

I was working on creating sound from one micro controller board and wanted the sound to be audible through a loud speaker. This called for a small audio amplifier and I had LM386 (old but still useful) in the junk box, so I set out to create a small board for it.

The schematic:

The PCB design:


Printer toner transfer, etched and drilled board:
(few holes were not perfect, first time trying my new Dremel tool for PCB drilling)


Assembled board:

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