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Audio PreAmplifier (Reconnsworld) - this is a very easy circuit to build, all
parts can be found at the local electronics shop, no matter how worthless it (the
local shop,) usually is...(electronic circuit added 9/03)
Balanced Low Noise Microphone Preamp - very low noise, close to oretical minimum,
high hum rejection and variable gain with a single rotary pot, similar to that used in
many professional grade mixing desks (added 8/03)
Car PreAmplifier & Artificial Earth - Especially for car audio installations, can
be used for any single supply system (schematic / circuit design added 9/02)
Computer Microphone - circuit by Lazar Pancic - adapting electret microphone to
soundcards with dynamic microphone inputs(electronic design added 6/07)
Dynamic Microphone Preamp - Notice how the transistor bias current flows through
the microphone. A similar circuit can be used with an 8 ohm speaker but in that case
you would put it in place of the emitter resistor. (added 2/05)
