This circuit is used in magnetic tape recorders, having been found in documentation in the 1960s. The circuit uses Japanese transistors, and the critical components are transformers.
This Japanese commercial radio with 5 transistors is from the 60s and is powered by 6 V. It is a...
We found this circuit in a Popular Electronics of the 90s. The circuit can also be used as a seat...
This circuit is from a 1978 French magazine Electronique Pratique. The magazine no longer exists, but...