High gain microphone preamplifier electronic project

  
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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 - schematic

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



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