This circuit makes use of a specific 80's component and was found in an American manual of the time. A matrix keyboard allows you to select one of several music programs.
The New Microchip development board is targeted to designers who work with 16- and 32-bit PICs....
Found a documentation on PCs from 1996, this circuit can be used as a shield. The relay is rated at...
This circuit is from a Japanese magazine of 1973. The circuit is designed to withdraw the power...