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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The tone generator is a programmed divider which produces certain frequencies. C1 is used to decouple power supply to avoid inter-modulation between output and IC. The component details with cost is also with this. Skip to datasbeet content. Touch Controlled Musical Bell. Previous post Next post.

This IC, with its three legs, looks like a transistor. Four beats of these can be selected.

I think the explanation i gave is enough to understand the circuit. Do not exceed 4. The details about the IC can be datwsheet here http: The component details with cost is also with. Basically, the output pin pin 3 turns on and off in a particular fashion to provide the tone. Powers the IC, typically with 3. Melody begins from the first note if power is reseted.


Many versions of UM66T are available which generate tone of different songs. UM66T is a melody integrated circuit. This project is suitable for beginners as its circuit is very simple. We connect this output to the Base of BC which will also switch on and off in the same tone. This high-density System-in-Package SiP integrates controller, power switches, and support components. Component List with cost Approximate.

Capacitor C1 is meant for noise suppression. UM66 has an inbuilt beat and tone generator. Interface GPS with Arduino. The melody will be available at pin 3 of UM66 and here it is amplified by using Q1 to drive the speaker.

You can not reprogramme it. These frequencies are a factor of the oscillator u,66. Like Admin has stated, UM66 is designed and manufactured with those melodies. This is the output pin, where tone is generated.

(PDF) UM66 Datasheet download

It has a 62 notes ROM to play music. Whistle to Beep Circuit. Connection Diagram The connection diagram is shown below. This is a simple project using the IC UM It is better that you should not run this circuit in Eliminator as most of the available eliminator don’t have datasheer good filter built in and have no precision over voltage protection.

The output of the IC that is the melody can be obtained at the pin BD pin3. Satasheet BT66T can operate only below voltage range 3. It is not possible to store our own music in UM Hello I cant get that circuit in digikey. I will add a voice recorder circuit soon.


The device has very low power consumption. The circuit should not be run in Rechargeable.

Ding Dong Sound Generator. I have searched for icum66 in the market but cannot find one.

Melody Generator using IC UM66

What can be done to strengthen the multiplier circuit? A set of 4 bits controls the scale code while 2 bits control the rhythm code. You may also like: It is mainly used in circuits where a tone has to be played as a notification for the user. As mentioned in the features, the BT66T comes in five different part numbers. The speaker can be driven by an external npn transistor connected to the output of UM Leave a Reply Cancel reply Your email address will not be published.

Is capacitor helps in sound suppression in this circuit? Resistor R1 limits the base current of Q1 within the safe values. Connected to the ground of Circuit. If you get a distorted sound you can add uF electrolytic capacitor in parallel to C1. Component Description IC and Transistor. If anyone want to reduce the volume of the circuit then insert a resistance in place of the blue line connection.