We found the circuit of this Japanese transistorized commercial receiver in a documentation from the 1960s. It is a radio for the medium wave range with 6 transistors and 9 V power.
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...