RF or even switching transistors like the 2N2222 can be used in this circuit. The capacitors are ceramic and the frequency is determined by the crystal.
Frequency modulated signals up to 500 kHz can be decoded with the PLL we show. The demodulated signal...
When operating near a medium wave radio, the signal frequency changes and this can be heard on the...
This 1967 Electronics World circuit is suitable for frequencies up to 1 MHz. The setting applies...