Melody generator schematic


Posted on Jun 3, 2012

This tiny circuit comprising of a single 3 terminal IC UM66 can be built small enough to be placed inside a greeting card and operated off a single 3V flat button cell. There is not much to the circuit. The UM66 is connected to its supply and its output fed to a transistor for amplification. You can either use a 4ohm speaker or a ` flat` piezoelectric tweeter like the one found in alarm wrist watches. If you use the piezo, then it can be connected directly between the output pin 1 and ground pin 3 without the transistor.


Melody generator schematic
Click here to download the full size of the above Circuit.

The UM66 looks like a transistor with 3 terminals. It is a complete miniature tone generator with a ROM of 64 notes, oscillator and a preamplifier. When it first came into market, it was programmed for the "Jingle bells" tune. Now they come with a wide variety of different tunes.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Sound Effects Generator 2
    RF 433MHz - 3 channels remote control
    Precision buffered reference
    Oscillators and Mixers
    op amp Humming and Transmission issues
    diy ambient orb with arduino update <77> comment page 3
    home-garden-light-led
    Subwoofer filter
    Glue stck torch
    Based on AT89C52 minimum system interface circuit
    Bidirectional thyristor AC contactor interface circuit



    Top