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.
Farewell blogspot.com - Since July 2008 I have been posting about my Amateur Radio activities including BITX20, MKARS80, JOTA, SOTA, KRMNPA, WIA, ARV and a few other acronyms alon...
3 years ago