Polyphonic DoorBell


Posted on Feb 5, 2014

An AC triggered Multitone, polyphonic doorbell. It gives eight melodious tunes for 2 minutes. On each press it will give a new tone which will continue till the melody is over. The circuit is too simple and battery operated It uses the popular melody generator IC UM3481. The circuit uses the popular melody generator IC UM3481. It generates


Polyphonic DoorBell
Click here to download the full size of the above Circuit.

music tones like Jingle bell, Santa clause is coming, Silent night, Holy night, Joy to the world, Rudolph, Red nosed reindeer, Merry Christmas, O come, All Ye faithful, Hark and the herald angel sing. UM 3482 generates 12 music tones. Capacitor C1 and resistor R2 are the oscillation components. Pin1 can be triggered either by DC or AC. Here low voltage AC is applied to the trigger pin 1 through R1 and D1. The circuit works off two pen cells which last for more than one year.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Timed Beeper
    Guitar and bass tuner
    Headlight Flasher Circuit
    Discrete Sliding Tone (Frequency Ramp) Doorbell
    Voice Operated Switch (VOX) Circuit Using LM346 For Public Address Amplifier System
    digital to analog
    LMV1090 Dual Input Far Field Noise Suppression Microphone Amplifier
    IR Remote Control Tester
    telephone number display circuit diagram
    Gray Tube Replication 75
    ULTRASONIC CONTROL RECEIVER
    DC Motor Controller and Tachometer
    BA3884 application circuit within the circuit and a



    Top