High gain microphone preamplifier electronic project

Posted on Feb 6, 2014

This microphone preamplifier electronic project is based on transistors and is capable of about 70dB or more gain at audio frequencies. Gain of this circuit is approximately equal to the product of the hfe of the both transistors times in the ratio of the load resistance to the input resistance of the preamp. As an approximation, these resistan

High gain microphone preamplifier electronic project
Click here to download the full size of the above Circuit.

ce are usually similar in value (2 to 5k) for most applications, so this ratio can be taken as unity.

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