Megabucks tube amp tones beloved by the likes of Joe Bonamassa, Kenny Wayne Shepherd and Carlos Santana in a stompbox you ...

A standard electret microphone can detect sub-audio "sounds" when some simple equalization circuitry is added.

One of the simplest ways to implement an SR flip-flop is using NAND gates. Above, you can see the basic circuit diagram of an SR flip-flop made using a combination of NAND gates. You can use any NAND ...