Ultrasonic switch


Posted on Feb 5, 2014

A new type of remote control based on ultra sonic sound. The transmitter part of the circuit is build around IC1(NE 555). The IC1 is wired as an astable multi vibrator operating at 40KHz. The output of IC1 is amplifier the complementary pair of transistors ( Q1 & Q2) and transmitted by the ultrasonic transmitter K1. The push button switch S1 is used the activate the transmitter.


Ultrasonic switch
Click here to download the full size of the above Circuit.

The receiver uses an ultrasonic sensor transducer (K2) to sense the ultrasonic signals. When an ultrasonic signal is falling on the sensor, it produces a proportional voltage signal at its output. This weak signal is amplified by the two stage amplifier circuit comprising of transistors Q3 and Q4. The output of the amplifier is rectified by the diodes D3 & D4. The rectified signal is given to the inverting input of the opamp which is wired as a comparator. Whenever there is an ultrasonic signal falling on the receiver, the output of the comparator activates the transistors Q5 & Q6 to drive the relay. In this way the load connected via the relay can be switched.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    1watt AM/CW 10-meter band transmitter
    Switch Debouncing
    Five-step voltage-level indicator
    1 KHz Sine Wave Generator Circuit
    digital thermometer schematics
    Polaris Jet Ski Model SLTX 1050
    2002 Chevy Cavalier heater/AC temp control wont light up at nite
    Solar-Powered High Efficiency Battery Charger
    813 SE triode amps
    H-Bridge
    Drum Solenoid Interface for Tap-Tempo Metronome
    Monostable Multivibrator
    FM Crystal Radio Receivers
    Thirty light water CNC circuit diagram CD4067 CD40193 NE555



    Top