Electronics Hobby Projects Gadgets - Ultrasonic transmitter and receiver circuit with CA3140 This is a circuit example describes the ultrasonic remote control switch, remote control distance of 10m or more, can be
Ultrasonic-transceiver under Ultrasonic Circuits -13836- : Next.gr
How an Ultrasonic Transmitter and Receiver Work?
ultrasound - 40 kHz ultrasonic transducer making an audible sound - Electrical Engineering Stack Exchange