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:

New Circuits

.

 


Popular Circuits

one wire keypad with PIC16F88
Capacitive load driver
Flash slave driver
Jfet bipolar cascode video amplifier
Subwoofer Filter circuit and explnation
Programming the AVR Microcontroller with GCC
Multipurpose Battery Eliminator Circuit using 4017 Decade Counter
99 nissan sentra
The Colpitts Oscillator
12V battery production controller



Top