Sensitive Microphone Question

[iwhitey]

I would like to build a very sensitive microphone capable of picking
up extremely low noise at about 3 feet. What approach is typically
used to pick up low amplitude audio signals? Thanks.

 

[Rod]

An old crystal mic, the sort used years ago, we're very sensitive and
produced a good voltage (high impedance) for such purposes. Try car boot
sales etc. They were used with valve tape recorders.
hope this helps.
Rod

"iwhitey" <iwhitey@rochester.rr.com> wrote in message
news:27767d17.0401201627.7cbe1499@posting.google.com...

I would like to build a very sensitive microphone capable of picking
up extremely low noise at about 3 feet. What approach is typically
used to pick up low amplitude audio signals? Thanks.