Found in a 90s Popular Electronics, it serves both TTL and CMOS logic. The injector can provide 10 kHz or 100 Hz signals. The circuit drives a transducer and two LEDs.
Found in a 90s 303 Circuits, this circuit has an output power of 100 mW. L1 consists of 890 turns...
The circuit shown was found in a 1967 RCA manual. Modern equivalent components can be used. The...
We found this circuit in the June 1988 Radio Electronics magazine. The power supply must be...