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.
Only signals about 1 kHz can pass through this tuned circuit. The main component is a operational...
This capacitive sensor that operates with a high frequency oscillator was found in Radio...
This circuit was obtained in a 1973s documentation. The transistors may be BC558 for the PNP and...