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.
Found in Popular Electronics from the 90s, this circuit can employ other low power audio...
We found this circuit in the same publication as the previous one (CB18947E). The circuit uses two...
Found in a manual of integrated circuits from the 90s, this circuit makes use of that time...