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 two-transistor circuit was found in the January 1994 issue of Electronics Now. The circuit can...
This configuration makes use of currently uncommon components. In fact, we found it in...
This configuration is from the National Semiconductor Linear Applications Handbook of 1994. The...