Condenser Microphone Amplifier Schematic using BEL 1895 IC

Posted on Feb 6, 2014

Here I will show you an audio amplifier circuit that can be used for walkie talkies, low power transmitters, and packet radio receivers. A condenser mic audio amplifier gives good quality audio of 0. 5 watts at 3 volts. Here we are going to make use of BEL 1895 (Bharat Electronics Limited 1895) audio amplifier IC which is also a noise free amplifi

Condenser Microphone Amplifier Schematic using BEL 1895 IC
Click here to download the full size of the above Circuit.

er IC. We are also using a pre amplifier section here to boost the weak signal from condenser mic. The pre amplified signal is connected to BEL 1895 audio amplifier IC. The preset in the first transistor acts as a gain controller, it can vary the gain of amplifier circuit. PCB layout is also given below. In order to enlarge the audio power, the low level audio output from the preamplifier stage is coupled to the audio power amplifier BEL1895 IC via coupling capacitor C1. Capacitor C3 connects the output to the loudspeaker. R1-C4 arrangement acts as the damping circuit for output oscillations. Capacitor C5 provides the boot strapping function.

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