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Old 8th March 2012, 03:16 PM   #1
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Default small stereo amplifier project

Hi,

I built this 2 channel 25 watt amplifier with two input selector and volume control using spare parts from my workshop.

Inside the unit, Noble potentiometer for volume control, rotary switch for input selection, stereo amplifier board from a commercial multi channel audio amplifier, power transformer.

The amplifier chip is the National Semiconductor LM3886.

- Richard
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Old 8th March 2012, 03:20 PM   #2
GoranB is offline GoranB  Poland
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Look nice!
Trafo isnt too close to inputs?
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Old 8th March 2012, 03:33 PM   #3
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It is closer than I would have liked, but it doesn't seem to cause any problems with the audio through the speakers. The transformer does make a mechanical noise (heard from the chassis directly) which can be heard if the room is very quiet.

- Richard
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Old 8th March 2012, 07:05 PM   #4
GoranB is offline GoranB  Poland
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As a workbench amp its perfect.
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