This circuit was found in a Japanese publication from the 1960s. It uses germanium transistors and is powered by a voltage of 22.5 V. The circuit includes the erasure oscillator.
This circuit is from 1968 documentation. We can assemble it with more modern components such as a...
Found in a 90s Silicon Chip documentation this circuit is intended to protect a speaker system in...
The UVTRON tube is an ultraviolet radiation sensor. In this circuit from Radio Electronics from...