This circuit, which can serve as a reference for restorations, was found in the October 1989 issue of Radio Electronics magazine. The circuit uses a 5-digit display and a dedicated integrated circuit.
We found this circuit that warns when the gate of a house is opened in an old documentation,...
With 3 transistors, we found this receiver in a documentation from 1966. The circuit has an output...
Generating a square signal (50% active cycle), this circuit was found in Siliconix documentation from...