This circuit was found in a 1977 documentation. It limits the voltage from a source using zener diodes on the rectifier bridge. It is an unusual configuration today.
Found in Popular Electronics from the 1980s, this circuit is intended for switching filters with...
We found this circuit in a French technical documentation from 1982. The circuit can be...
This circuit was found in a 1997 magazine. It uses a CMOS 4060 circuit powered by 12 V which is...