The circuit was designed to provide more efficient output with a dynamic microphone by using a low noise preamplifier.
A microphone amplifier that may be used with either Electret Condenser Microphone (ECM) inserts or dynamic inserts, made with discrete components.
This is a design for a low noise microphone preamplifier, which is ideally suited to low impedance microphones. One limitation is that it is not balanced, which is not a problem in a home recording environment, but will allow the mic lead to pick up noise with long cable runs or in a hostile environment.
This circuit is mainly intended to provide common home stereo amplifiers with a microphone input. The battery supply is a good compromise- in this manner the input circuit is free from mains low frequency hum pick-up and connection to the amplifier is more simple, due to the absence of mains cable and power supply.
This is a simple microphone preamplifier circuit which you can use between your microphone and stereo amplifier. This circuit amplifier microphone suitable for use with normal home stereo amplifier line/CD/aux/tape inputs.
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Provides 5 to 6dB better S/N, better common mode hum and buzz rejection and inceased RFI immunity.