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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UM66 Datasheet, PDF – Alldatasheet

It is designed for use in bells, telephones, toys etc. The melody will be available at pin 3 of UM66 and here it is amplified by using Q1 to drive the speaker. The component details with cost is also with. Powers the IC, typically with 3.

Do not exceed 4. Ding Dong Sound Generator.

The BT66T can operate only below voltage range 3. Touch Controlled Musical Bell. Skip to main content. The circuit should not be run in Rechargeable battery also if the Speaker resistance is less than 8 Ohm and may burn the Transistor. Do remember that this IC will be able to play only one tone, if you need a different tone you have to use a different IC with a different part number as shown above. Connected to the ground of Circuit.


Melody begins from the first note datssheet power is reseted. Interface SD Card with Arduino. The component details with cost is also with this.

(PDF) UM66 Datasheet download

The details about the IC can be found here http: You need a voice recorder circuit interfaced with a amplifier circuit. This is the output pin, where tone is generated.

C1 is used to decouple power supply to avoid inter-modulation between output and IC. Assemble the circuit on datasueet good quality common board. This IC is easy to use because it can work on low voltage 0. The circuit can be made even without soldering and the ideal for the first electronic project for newbies.

When power is turned on, the melody generator is reset and melody begins from the first note.

This is the simplest ever musical calling bell that can be easily built. Interface GPS with Arduino. This is a simple project using the IC UM Is capacitor helps in sound suppression in this circuit? Many versions of UM66T are available which generate tone of different songs. The volume of the dataseet of this circuit is so much that it can be used as a calling bell.


Resistor R1 limits the base current of Q1 within the safe values. Capacitor C1 is meant for noise suppression. The output of the IC that is the melody can be obtained at the pin BD pin3.

UM66 IC Datasheet | Melody IC Pin Diagram

We connect this output to the Base of Dataasheet which will also switch on and off in the same tone. Thanks for the CMOS technology. Component List with cost Approximate. In this circuit please don’t give the supply beyond 3 volt without. UM66 has an inbuilt beat and tone generator. What can be done to strengthen the multiplier circuit? Data sheet of UM66 is there in the datasheet section of the site.