Lately I have been using a Dynamic microphone for Bitx3B as shown in pictures below.The audio seems to be quite good with it.
One important part that has to be installed in line of microphone is a 3.3uf Tantalum capacitor, to block the positive 12 volts TX voltage.
Q15 which is 2n3904 in the mic pre amp stage can be changed to BC549 which is a low noise VERSION,
The gain seems to be better then 2n3904 and much better audio quality, it has to mounted in reverse.
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One important part that has to be installed in line of microphone is a 3.3uf Tantalum capacitor, to block the positive 12 volts TX voltage.
Q15 which is 2n3904 in the mic pre amp stage can be changed to BC549 which is a low noise VERSION,
The gain seems to be better then 2n3904 and much better audio quality, it has to mounted in reverse.
