Melody Generator using IC UM66

Melody Generator Circuit

Description

Here is a simple melody generator circuit you can make using an IC.The  UM66 series are CMOS IC’s  designed for using in calling bell, phone and toys. It has a built in ROM programmed for playing music. The device has very low power consumption.Thanks for the CMOS technology.The melody will be available at pin3 of UM66 and here it is amplified by using Q1 to drive the speaker.Resistor R1 limits the base current of Q1 within the safe values.Capacitor C1 is meant for noise suppression.

Notes

  • Power supply  must be between 1.5V & 4.5V .Do not exceed 4.5 V.
  • Speaker can be driven with external NPN  transistor.
  • Melody begins from the first note if power is reseted.
  • Assemble the circuit on a good quality common board.
  • If transistor HE8050S is not available use any NPN transistor like BC548 or 2N2222.

Circuit Diagram

Melody Generator Circuit using UM 66 IC

Melody Generator Circuit

UM 66 IC – Data and Specifications

UM 66 Data Sheet with specifications

UM 66 Data

We have other Tone Generator circuits that you may like; Take a look:

1. Police Siren

2. Ding Dong Sound Generator

3. Two Transistor Siren

4. Whistle to Beep Circuit

5. Touch Controlled Musical Bell

Show Comments

24 thoughts on “Melody Generator using IC UM66

  1. keke

    can ic555 timer be used in water level indicator with alarm to generate tone? if yes, can you help on how to substitute it with icum66.

    Reply
  2. Seetharaman

    Hi Sunil It is manufacturer’s product ID. C1 is used to decouple power supply to avoid inter-modulation between output and IC. If you get a distorted sound you can add 100uF electrolytic capacitor in parallel to C1

    Reply
  3. krishna

    sir, i want to know about the purpose of capacitor in this circuit and why we connected capacitor in parlell of circuit give reason

    Reply
  4. twits4twats

    is it possible to store our own created music into um 66 if yes , how to store it… what circuit can be used. if not can any one tell me a nice way to “Design a circuit to create, play and save ringtones”

    Vignesh

    Like Admin has stated, UM66 is designed and manufactured with those melodies. You can not reprogramme it. You need a voice recorder circuit interfaced with a amplifier circuit.

    Reply
  5. vignesh

    is it possible to store our own created music into um 66 if yes , how to store it… what circuit can be used. if not can any one tell me a nice way to “Design a circuit to create, play and save ringtones”

    Reply
  6. Seetharaman

    UM66 is a 3 pin melody device. once the supply is given to pin 1 & 2 it will give continuous audio out put at pin3, which is not sufficient to drive a loud speaker, hence an additional direct coupled amplifier is added to drive a small speaker.

    Reply
  7. abdulsalam

    i want the electronic copy (write up document) of this circuit by friday to complete my project work. it will help if you guys will sent every thing about this circuit

    Reply
  8. shyaman

    Dear sir,

    could you forward me a 30second sound circuit that activated by another speaker out(alarm clock)
    Thanks
    shyaman

    Reply
  9. Pingback: Anonymous

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