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.
The circuit shown in the figure is based on the ST Microelectronics TDEO0160 (www.st.com) and...
In this circuit the LED lights up when the voltage drops below the value set in the trimpot. The...
This 1960s Japanese receiver uses 6 germanium transistors, being powered by a 6 V voltage obtained...