UM66 BASED MELODIOUS SOUND GENERATOR

"keen to know how to make melodious sound in your project" , this tutorial would help you to make a simple and easy to make sound circuit  using special IC's. Very easy to connect with micro controllers and interesting one too. starting from the old IC we would build a circuit to generate sound around UM66. these days this ic is known by the name BT66. It is a low cost easily available ic which can produce sound.UM 66T is a melody integrated circuit comes in the series UM66TXXL designed for use in telephones,door bell and toy applications.

FEATURES

*64-Note Rom memory
*1.5V ~ 4.5V power supply and low power
consumption
*Dynamic speaker can be driven with external NPN
transistor
*OSC resistor hold mode
*Power on reset: melody begins from the first note
*Built in level hold mode

SONG SERIES LIST

 UM66T05L Home sweet home
 UM66T19L For Alice
 UM66T32L COO COO waltz

The operating voltage of the UM66 is 1.5 to 4.5 volts with the minimum voltage of 1.5V and maximum voltage of 4.5V. The suitable operating voltage is 3V with the maximum current requirement of 60 micro amperes.

CIRCUIT DIAGRAM

2N222 IS A GENERAL PURPOSE NPN TRANSISTOR USED TO DERIVE SPEAKER.
the shape of UM66 is similar to the transistor. Be cautious while connecting the components to PCB or breadboard.
TO KNOW HOW TO POWER UM 66 READ CONVERT 9V to 3.3V