We found this circuit in an old English documentation. Transistors support modern equivalents. The circuit converts signals in the 5 to 15 MHz band for tuning into a common medium wave radio.
Found in a 1964 CQ magazine this circuit consists of an automatic telegraphic key, providing the...
This circuit allows the detection of RF signals using the lowest range of direct currents of a...
This sweep oscillator was found in 1980s American documentation and can be assembled with current...