We found this circuit for video games in a Radio Electronics magazine from August 1977. The transistor can be any common RF type that reaches the desired signal frequency.
This circuit uses three inverters to generate a rectangular signal whose frequency depends on R1...
This squelch circuit used in transmitters was found in a magazine for radio amateurs 73 in the...
Mouser Electronics is making available the Texas Instruments DRV401 Q1 integrated circuit, a...