Carbon Microphone as a Detector

Discussion in 'Homebrew and Kit Projects' started by VU2NAN, Jul 7, 2019.

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  1. VU2NAN

    VU2NAN Ham Member QRZ Page

    The carbon microphone behaviour was successfully simulated using two metal plates of size 8" x 8" x 1/16" and carbon granules salvaged from a discarded water filter.

    With one plate placed horizontally on the table, a thimbleful of carbon granules was distributed at the four corners and then sandwiched by the other plate.

    During tests the signal strength was found to be fair with the specimen directly connected and very good with a rundown button cell connected in series with it.



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