Re: Audio pre-amplifier for microphone?

VK3HN
 

I bought one of these to experiment with, thinking there may be an op amp gain stage between the electret and the A pin (audio out). Unfortunately, there isn't. So unless you want a VOX, this module doesn't improve over an electret mic insert and a series resistor to the phantom DC supply. Note also that A has DC on it, there is no series capacitor. 

There is apparently a similar Arduino/breakout module, about the same size, with an on-board electret insert, that does have an op-amp gain stage, leading to an audio output.  This could replace the mic amp on a homebrew exciter.  I am not thinking of the SSM2167 modules which are another thing altogether.   If anyone knows where these are, please post a URL.

73 from Paul VK3HN.  

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