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.
This circuit uses in operational amplifier to produce square and triangular low frequency signals....
This shield can be used both to interface microcontroller circuits or TTTL. The resistor in series...
This circuit can gerenate square signals and be comanded by na external control. When the input...