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 can be powered by a solar cell. The circuit is from a 1991 documentation having a...
This low power amplifier was found in a Japanese publication from the 1960s, using transistors from that...
This is the traditional configuration of an inverter amplifier with operational. The operational...