Simple one transistor microphone preamplifier:

Posted by Ilias-Man On Sunday, January 29, 2012 2 comments

This easy circuit is a good amplifier for low audio signals such as electret microphone. Use it in front of an RF oscillator to make an RF transmitter that’s very sensitive to sound, you can use a lithium cell 3.6v to power it or just 9v battery. you can also make multiple stages to get more amplification.

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