What kind of ICs are used in an ultrasonic transmitter?
This drift in frequency affects the range of transmission from the ultrasonic transducer. The ultrasonic transmitter and receiver circuits described here use CD4017 decade counter ICs. The transmitter circuit (Fig.1) is built around two CD4017 decade counter ICs (IC1 and IC2), D-type flip-flop IC CD4013 (IC3) and a few discrete components.
Where is the transducer in an ultrasonic transmitter?
The receiver’s transducer unit (RX) is kept near the ultrasonic transmitter under test. It detects the transmitted 40kHz signal, which is amplified by the amplifier built around transistor BC549 (T2).
Can a CW circuit be changed into an ultrasonic circuit?
The circuit could be changed into an ultrasonic cw transmitter by breaking the IC’s pin 7 connection and inserting a switch key in series. In that case, you will require some form of ultrasonic receiver to hear the signals; and that is the exactly what we are going to discuss in our next circuit.
What can you do with an ultrasonic circuit?
The post discusses a 6 very useful yet simple ultrasonic transmitter and receiver circuit projects which can used for many crucial applications, such as ultrasonic remote control, burglar alarms, electronic door locks, and for listening to frequencies in the ultrasonic range which are normally inaudible to human ears.
What kind of transistor is used for ultrasonic speaker?
Transistor T3 (SL100) amplifies the 4kHz signal to drive the speaker. Use a 9V PP3 battery to power the receiver circuit. House the transmitter and receiver circuits in separate small cabinets. If the 40kHz transducer under test is working, the receiver circuit produces audible whistling sound.
What kind of oscillator does an ultrasonic transmitter use?
Most ultrasonic transmitters and receivers are built around timer IC 555 or complementary metal-oxide semiconductor (CMOS) devices. These devices are preset-controlled variable oscillators. The preset value of the working frequency is likely to drift due to mechanical vibrations or variations in temperature.