We found this circuit in a 1986 documentation. It uses only LEDs, batteries, resistors and the power supply which can consist of 4 batteries or a 9V battery. The basic circuit uses two-color LEDs.
This 10.7 MHz sweep generator circuit is suitable for applications in the analysis of FM devices with...
This circuit is from the 1993 Linear Technology Applications Databook. The component is uncommon...
Found in an old Popular Electronics this circuit causes a bicolor LED to alternate the colors of...