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 interesting idea was obtained in a 1982 documentation and can be used for special effects in...
This is another of the many circuits we have with the 8038. The circuit is from the Radio...
This LC oscillator was found in English documentation from the 1990s. JFETs may be general-purpose...