Electronics Infoline Web

High Performance Audio Applications of the LM833

RIAA Phono preamplifier stages and active crossover ne2-rks

http://www.national.com/an/AN/AN-346.pdf

Sound detector amp/electret mike amp

this circuit amplifies the output of a regular electret condensor microphone quite nicely.. adjust sensitivity by turning R1

http://www.reconnsworld.com/audio_electretamp.html

Balanced microphone preamp project

A PAiA preamp - usual input circuity followed by one half of dual op-amp rigged in fixed 20dB amplification circuity

http://www.nomad.ee/micros/preamp1.html

Computer Microphone

A composite amplifier using two transistors. The BC413B and BC547C

http://www.zen22142.zen.co.uk/Circuits/Audio/compmic.html

High quality mic preamplifier

Uses Op Amp Labs modules 425

http://www.opamplabs.com/425mic.htm

ECM Mic Preamplifier

A microphone amplifier that may be used with either Electret Condenser Microphone (ECM) inserts or dynamic inserts, made with discrete components.

http://www.zen22142.zen.co.uk/Circuits/Audio/ecmmic.html

Low Noise Balanced Microphone Preamp

This simple design has very low noise, close to the theoretical minimum, high hum rejection and variable gain with a single rotary pot. It is similar to that used in many professional grade mixing desks and can form the basis of a no compromise recording mixer for live work.

http://sound.westhost.com/project66.htm