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:

New Circuits

.

 


Popular Circuits

StunGun circuit
2 LED flasher with two 2N3904 transistors
Logarithmic amplifier
Voltage regulator
Arduino solenoid project behaves strangely when operated on PC power supply
Simple Surround Sound Decoder
microphone Sennheiser MKH 415 T
10 band graphic equalizer schematic
Tachometer circuit
Analogue Inputs to MIDI Out
Mini GSM localizer without GPS
Thyristor cascade speed control circuit
Door light emitting logic circuit with CD4069



Top