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.
This stereo preamp uses only two germanium transistors. The circuit was found in old documentation using...
I found this circuit in a 1989 American publication called Electronics Handbook. The circuit...
This is the power source suggested in the old European publication for the CB19635E watch. The...