Or integrated circuit used in this circuit two years 80 and little common in those days. The two component heats depend on the triac trigger characteristics.
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...