This circuit is an improvement over the previous one, using the same capacitor system as a sensor. We also found it in Radio Electronics from the 80s.
Found in a 90s Popular Electronics, this circuit excites a 40 kHz ultrasonic transducer. The...
Found in Popular Electronics, this configuration can be powered by voltages from 6 to 12 V....
This circuit can be powered from 4 to 12 V sources. Pin 6 is the positive supply. See more about...