DataSheet: PDF icon UMpdf. UM66T is a melody integrated circuit. It is designed for use in bells, telephones, toys etc. It has an inbuilt tone and a beat. DESCRIPTION. The UTC UM66TXXL series are CMOS LSI designed for using in door bell, telephone and toy application. It is an on-chip ROM programmed for. BT66T is an easy to use 3 terminal Melody generator IC. It is mainly used in circuits where a tone has to be played as a notification for the user.

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This is a simple project using the IC UM UM66 has an inbuilt beat and tone generator.

This IC, with its three legs, looks like a transistor. This project is suitable for beginners as its circuit is very simple.

UM66 Datasheet PDF

It has a built in ROM programs for playing music. The device has very low power consumption. Thanks for the CMOS technology. The melody will be available at pin 3 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. We have other Tone Generator circuits that you may like; Take a look: Ding Dong Sound Generator. Whistle to Beep Circuit. Touch Controlled Musical Bell.

Melody Generator using IC UM66

C1 is used to decouple power supply to avoid inter-modulation between output and IC. If you get a distorted sound you can add uF electrolytic capacitor in parallel to C1. Is capacitor helps in sound suppression in this circuit?

Hello I cant get that circuit in digikey. Where can i buy Which is the nte replacement.

(PDF) UM66 Datasheet download

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. It is not possible to store our own music in UM Datadheet will add a voice recorder circuit soon. UM66 is a 3 pin melody device.


UM66 Datasheet, PDF – Alldatasheet

Data sheet of UM66 is there in the datasheet section of the site. I think the explanation i gave is enough to understand the circuit. The details about the IC can be found here http: Your email address will not be published.

Do not exceed 4.

Melody begins from the first note if power is reseted. Assemble the circuit on a good quality common board.

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I have searched for icum66 in the market but cannot find one. I will help you. Dear sir, could you forward me a 30second sound circuit that activated by another speaker out alarm clock Thanks shyaman. Leave a Reply Cancel reply Your email address will datasheet be published.