Hello All,
I'm new the the forum, and I was hoping for some help.
I am trying to design a circuit, but I don't know where to start.
I have a device that emits a high pitched, loud sound at random times.
I was hoping to create a device that could turn on an LED when the sounds occurs. The problem is that I can't open the device, so I can't tie directly into the speaker.
I was thinking I would need to have a microphone, filtered in some way to only trigger the LED when the specific frequency is detected.
My final issue is that it needs to be as small as possible.
I was hoping you could help me out.
Thanks all