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 is an amplifier stage with a typical germanium transistor from the 60's to the 70's. The...
Also suitable for use as a noisy alarm, this Morse Code or telegraph practice oscillator was found...
This circuit was found in ancient American documentation. Diodes are general-purpose types. |...