Found in documentation from 1924, this receiver has several sets of coils. Power is supplied by several batteries and listening on high-impedance headphones.
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...