Sound-Activated Lamp (Relay/Switch)


Posted on Feb 5, 2014

This simple circuit shown int the schematic diagram actives the switch using sound. We can use this circuit for various applications, such as automatic (sound-controlled) disco light or car`s LED light show. The Q1 amplify the audio from mic. The R1 is used to adjust the peak of signal to greater than about 0. 7 volts, act as sensitivity adjuster.


Sound-Activated Lamp (Relay/Switch)
Click here to download the full size of the above Circuit.

A certain level, the signal coming from microphone, after amplification by Q1, will trigger the SCR and light lamp I1. If we change the lamp with a relay, then we can get a sound-activated relay/switch, which can be used to control more powerful / high wattage high voltage lamps. If we use a relay, place a 1N4007 diode in parallel with the relay coil to prevent the back-emf from relay coil destroying the SCR. Here is the schematic diagram of the circuit:




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Automatic switch for batteries
    13.8Vdc 2A Regulated Power Supply Circuit
    Arduino Liquid Crystal Displays
    DZW75-48/5050II input circuit
    Transistored 10W Audio Amplifier
    microcontroller Arduino 230v Light bulb dimming
    Spice Component Circuit Modeling and Simulation
    Automatic Heat Detector
    DC Chopper control vs Phase Angle control
    Operation of an Pierce Oscillator
    Dicing With LEDs
    555 Rock lantern controller circuit diagram
    DC shunt regulator power supply circuit
    FGDF-3 three-phase low-temperature iron plating main circuit



    Top