This 5.1 MHz circuit was found in a 1980s documentation. The frequency is given by the crystal and general purpose transistors can be used.
This circuit is from a 1980s Signetics documentation. The circuit separates the modulation signal from a...
This circuit was obtained from an Auguist 1974 Everyday Electronics magazine. The circuit is still...
This clipper or limiter circuit limits the amplitude of AM or FM audio signals. The diodes are...