This circuit was found in a 1965’s General Electric documentation. It is intended for low voltage brush motors. The SCR must be according to the engine controlled.
The circuit shown in the figure is suggested by ON Semiconductor (www.onsemi.com), based on its...
September 2016 - can be found at Mouser Electronics the new amplifiers with digital variable gain...
This simple 1-transistor audio preamplifier appeared in the June 1968 Radio Electronics magazine. The...