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 purpose of this circuit is to provide a constant current to an experimental electromagnet. The...
The circuit shown uses the LM324, but can be implemented with other operational ones. The source...
This circuit uses the 741 Operational Amplifier to drive two LEDs. The LEDs indicate the signal of...