This receiver of two transistors for the 3.5 MHz band was found in a circuit manual from the 80's. The coil data are found next to the diagram and the transistors can be general purpose PNP.
This coupler allows the triggering of a TTL port or flip-flop from an SCR. The resistor R must be...
This amplifier with very high input impedance was suggested by Texas Instruments in a manual of...
This circuit was found in a 1980s documentation for amateur radio. The circuit makes use of...