Simplest Microphone Booster Circuit or Pre-Amplifier Circuit Diagram

Simplest Microphone Booster Circuit Diagram, or Basic Pre-Amplifier Circuit Diagram with Simplest Battery Level Monitor.

Friends this circuit works perfectly and boosted sound is crystal clear and this circuit works very large voltage deference 5 Volt to 14 Volt DC.
And one thing, in this circuit has very very simplest battery monitor circuit this single LED indicator which LED ON if battery voltage higher than 6 Volt and terns OFF if battery voltage lower than 6 Volt. 

This circuit diagram is personal of "AMKP40 technology".
If you have any questions about this circuit please comment below in the comment section I will answer you rapidly if possible.




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