Reply to thread

Hi,

We have an electrical product which when it breaks it gives out a constant tone at approximately 1kHz to 4kHz.

So we want to detect this with a microphone and have a circuit to take the output of the microphone and

signal to us that the sound is being emitted.

So we need a really cheap microphone that consumes very little bias current.

Cheapest I can find is this piezo microphone...

[URL unfurl="true"]https://www.farnell.com/datasheets/2877014.pdf?_gl=1*wd1u56*_gcl_au*MTI5OTAzODk1Mi4xNzQxMDMzNjAz[/URL]

Do you know of any cheaper?