This circuit was found in the February 1983 issue of Radio Electronics magazine. It is a 4-digit circuit with dedicated integrated circuits, with no power supply indicated.
We found this circuit in a 1980 documentation. With basic changes, including transistors that were...
This circuit was found in a Radio Electronics from July 1963. The diodes and transistor are...
We found this circuit in a 2002 documentation. The circuit is an emergency lighting system with an...