This circuit aims to increase the selectivity of receivers whose FI is 455 kHz. The circuit is from 1975 documentation. The transistors can be the modern BF494 equivalents.
This circuit, which has a very common configuration, was obtained in a 1994 documentation. It can...
This power control was found in a 1968 power circuit manual. The SCRs are according to the power of...
This traditional crystal radio circuit was obtained from a 1990 documentation. The diode can be...