Linux-Hams archive - September 1998: soundmodem ptt circuit

soundmodem ptt circuit

Mike Bilow (EEST)
Sat, 05 Sep 98 20:30:00 -0000

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Hamish Moffatt wrote in a message to Mike Bilow:

HM> I see -10.9V on RTS. I see -0.61V on the base of the 548,
HM> but 0V on the collector (no audio connected) and hence 0V on
HM> the tip of the plug.

HM> Any idea what might be wrong?

A very American question: is a BC548 NPN or PNP? Which is the collector? :)

-- Mike

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