Whistle Light Switch

Posted on Feb 7, 2014

With this whistle light switch you can turn on and off the lighting installation. The main part of this circuit is the UM3763 IC, produced by UMC. The piezo-ceramic buzzer is used here as a microphone and when it receives a tone frequency between 1. 2 kHz and 1. 8 kHz, the IC`s output will go HIGH. This means that the light will go ON if it was OFF, or go OFF

Whistle Light Switch
Click here to download the full size of the above Circuit.

it was ON. For light control the UM3763 triggers a triac through T1. The supply voltage is taken directly from the main power supply. D1 and D2 diodes are used as rectifiers, and D3 limits the voltage at 3. 9 V. D2 LED is used as an indicator of operating or idle state.

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    Solar Garden LED Lighting
    Car Ice ararm circuit
    583 circuitsmiths electric power assist bicycle
    TC649 motor drive circuit with overheat protection
    A control circuit diagram 555 pairs steady mode
    Automatic light control one lamp lighting circuit b