Beeps when hears your whistle, A gadget suitable for key-holders, games etc. Some 20 years ago it was common to see small key-holders emitting an intermittent beep for a couple of seconds after its ...

Here is a great collection of touch switch circuits. A touch switch is an electronic device that enables us to control a circuit by simply touching a sensor. Simple touch switch circuit with 4011 – ...

Chaotic circuits can arise from either computed (using Analog Computers or Digital Computers) solutions to coupled differential equations or from unstable systems/circuits. A new open-source circuit ...