Thursday, July 2, 2020

Earbud driver using a mosfet output stage

It is not pretty but it sings. I put a drop of glue where the part was located on the schematic and attached the parts. Then it was just a matter of connecting the dots with a piece of wire.

50uv input gives 800ua output. My eadbud is rated 1ma so that is enough. With 100uv input the signal distorts and will act as a "plate detector" receiving AM.

I changed some capacitor values for the build. This is the response for my build. I can add a 12" test lead to the input and receive my local AM station.

 This could be my new favorite. It does need a receiver built to feed it.

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