This isolation circuit for audio signals was found in the August 1992 issue of Radio Electronics magazine. The circuit can be applied to other operational amplifiers.
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...