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.
This circuit is indicated for measurement bridges as a null detector, thanks to the logarithmic gain...
This circuit, of a Popular Electronics of 1969 is destined to firing a gas LASER of the time. The...
This bass booster preamp is from an English publication (1966). We can mount it with more modern...