This CMOS logic-based circuit was found in the April 1974 issue of Radio Electronics magazine. The circuit is based on a period display and has hour and minute indications.
The power of this amplifier is 100 mW given by the characteristics of the transistors used. The...
Found in an American documentation from the 50's, this circuit uses two transistors of the time,...
This version is from an old 80's documentation. The SCR can be the TIC106 and the unijunction...