This is a simple mic amplifier circuit which is using two stages first a mic preamplifier circuit stage and second a audio amplifier circuit stage. The working of the circuit is very simple, the electret microphone in the circuit receives the audio signal and pass it to the transistor 2N3904 which 
amplifies the audio signal and send it through the 10K variable resistor to the audio amplifier stage which is build with LM386 Amplifier IC. The LM386 IC amplifies the microphone preamplifier signals and send it to the 8 ohms speaker. 
Simple Mic Amplifier

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