Sunday, January 23, 2011

Audio amplifier for condenser mic

- D. Prabakaran
This is a low cost condenser mic amplifier that provides amplified audio output of 0.5 watts at 4.5 V supply. The preamplifier portion uses two BC148 transistors that amplifies the weak audio signal output from the condenser mic. The output of the preamplifier is fed to the input of a BEL1895 IC. It is a monolithic audio power amplifier commonly used in AM radios. The output from the power amplifier drives a 4 Ohm speaker through a coupling capacitor C14 (470 uF).


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