DIY Knock Detector

We may earn a small commission from affiliate links and paid advertisements. Terms

I take no credit for this... but i built mine own according to this article.



bought my materials at rad shack for $20
l_e8f9c1332b317b6fa28aef72c7f4b8f1.jpg



open it up.
l_a861243a23b98d0aefc8f15c9d003f06.jpg



the microphone was cut off of the circuit board. take care to not forget the polarity. i wired up 6ft of wire and soldered it to the mic, then stuffed it into the alligator clip and secured it.
l_f0f3b5b766cab566af0467ae8ec0f4a8.jpg



repeat on the other side. i used green for negative and red for positive.
l_6dd242380b649c1f2e25b8a567acd81d.jpg



put it back together and test it out. works best with a friend. put the headphones on and clip the "mic" to something that makes noise (like the fridge... or your cat!) turn it on and listen!
l_c7eaa48fdc62fbd1ebcca0ae0c61ae55.jpg




and that is how we do it.
 
Last edited by a moderator:
Back
Top