Components
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U1 - LMV358 |
x 1 | |
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C1 |
x 3 | |
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C2 |
x 1 | |
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C3 - 1uF 0603 10V |
x 1 | |
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R1 - 68K 0603 |
x 1 | |
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R2 - 3.3K 0603 |
x 2 | |
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R3 - 1K 0603 |
x 1 | |
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R4 |
x 1 | |
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R8 - 10K 0603 |
x 1 |
Description
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.
Mar 19,2020
1,930 views
Low power microphone pre-amp
2 Layers PCB 17.2 x 27.3 mm FR-4, 1 mm, 1, HASL with lead, Red Solder Mask, White silkscreen
A simple pre-amp designed around the LMV358 op-amp and intended for use with electret microphones but adaptable to other audio purposes.
1930
0
0
Published: Mar 19,2020
Download Gerber file 34
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