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U1 - LMV358 |
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C1 |
x 3 | |
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C2 |
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C3 - 1uF 0603 10V |
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R1 - 68K 0603 |
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R2 - 3.3K 0603 |
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R3 - 1K 0603 |
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R4 |
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R8 - 10K 0603 |
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Low power microphone pre-amp
Designed this little module to add a line out to a RF lav mic belt pack I picked up cheap on eBay.
Built with the parts list provided it has a gain factor of 51 (appx. 10mV in, 500mV out) with a noise level more than sufficient for audio applications. Runs off a single ended DC power supply from 2.7 to 5V, and can easily be adapted to other small signal amplification tasks in the audio frequency range by changing the biasing and feedback resistors.
Low power microphone pre-amp
Project images are for reference only. Actual production is based on the manufacturing files on the project page.
Please review the designer's notes (e.g., PCB thickness) and select the appropriate options.
PCBWay is not responsible
for issues caused by unsuitable parameter selections.
For more important ordering information, please refer to
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