Found in a 1964 Electronic Design, this circuit generates 1 A pulses with durations from 100 us to 10 ms. The circuit makes use of transistors of the time.
This circuit triggers the LED when the monitored battery voltage drops below 9 V for 12 V...
We found this circuit in a Radio Electronics from January 1967. The SCR is already the C106, which...
This power source with silicon diodes at a time when valves were still used was found in Radio...