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.
To use the instrument for AC measurement, the tips are A and B. For CC use tips A or B for...
This power supply was originally designed to power our next circuit (CB18672E) which consists of a...
This circuit was obtained in a 1990 English magazine. The circuit can be assembled with equivalent power...