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Main chip:LM393. Electret condenser microphone. Circuit board output switch quantity. when there is sound,outputs low level and the signal light. the output effective signal is low level. R eference routines, circuit diagram and detailed specification will be provided after perchase.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.