I have a microphone that is externally similar to the Electret type mics, but is designed to pick up the frequency of 38 kHz +/- 1 kHz. Link is http://www.mouser.com/ProductDetail/Kobitone/255-328SR16M-ROX/?qs=%2Fha2pyFaduhjPDaN57Th6BWwB9YLUCmPAhi50ajSVD5S3CG7NdhYmA%3D%3D . Obviously I need to build…

Pre-amp circuit for high frequency mic

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