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Re: sBitx Mic input - assist request

 

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the base-emittter voltage of QD1 schould be about 0,7 V but is 3,9 V -2.3 V = 1.6 V, my guess: defect transistor or wrong measurement.

Am 09.03.2025 um 17:02 schrieb WF4RC Carroll:

I have a new sBitxV3 board only. Everything is working except the Mic input. I started experimenting with some microphone I had and the recorded transmission has lots of noise and very low audio. I measure 2.1v on mic input tip. I think it should be 5v. Can anyone guide me as to what the issue may be and where I should look. Here are my measurements/ calculations.?
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