Melody Generator using IC UM66

Melody Generator Circuit


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.


  • 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

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