[sdiy] SMD ceramic caps are microphonic

[Paul Perry]

I remember seeing a "car engine stethoscope" diy article 
in an electronics mag a few years ago. The audio pickup
was a ceramic disc cap cemented to the end of a screwdriver..
I would have tried doing something with the element from
a piezo gas stove lighter gun, myself.

----- Original Message ----- 
From: "Grant Richter" 
> Used a SMD ceramic cap for DC blocking between the noise transistor  
> and the amp.
> Turns out the cap is microphonic.
> Might make a good vibration sensor for electronic bongos.