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Audio Pre-Amplifier - This simple circuit provides good gain to
weak audio signals…. [Tony van Roon's circuit]
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 - This circuit was submitted by Lazar Pancic
from Yugoslavia. The sound card for a PC generally has a microphone
input, speaker output and sometimes line inputs and outputs. The mic
input is designed for dynamic microphones only in impedance range of
200 to 600 ohms. Lazar has adapted the sound card to use a common
electret microphone using this circuit....(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.... [Reverse engineered schematic by Stepan
Novotill]
Dynamic Microphone Preamplifier - A low noise pre-amplifier suitable for amplifying
dynamic microphones with 200 to 600 ohm output impedance....(electronic design added 6/07)
ECM Mic Preamplifier - A microphone amplifier that may be used with either Electret
Condenser Microphone (ECM) inserts or dynamic inserts, made with discrete components….
[Designer Andy Collison]
