This circuit with 4 transistors can receive signals in 6 shortwave bands. The circuit is from a Radio Electronics from May 1958. The output is for high impedance headphones.
This circuit in a receiver that allows the capture of distant stations with short waves. The...
This was a very popular instrument in the workshops of the 60s and 70s. It was a "top of the line"...
This source is more elaborate than the previous one because it uses two transistors. The source is...