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 causes an LED to flash at a frequency determined by the capacitor. The circuit has an...
This low power two-phase motor control was obtained in a 1989 publication. The circuit is for...
This circuit was found in European documentation from the 1980s. The unijunction may be 2N2646 and the...