Light by whistle electronic project circuit diagram

Connecting the electric circuit to the lighting installation can be on or off the light by whistle. The circuit is built using the UM3763 chip, a switch controlled by sound. Buzzer piezo-ceramic is used in circuit as a microphone. When it captures a tone frequency between 1.2 kHz and 1.8 kHz, output pin 8, will flip (bulb goes off to on, or turn to off).

To control the light, IC1 control a triac through transistor T1. Power
IC1 power is taken directly from the AC network, acting as a capacitor reactance series resistance with low loss. Diodes D1 and D2 form a rectifier and D3 limits the voltage value of about 3.9 V. Since the voltage is low, instead of D2 can be used an LED.