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

Battery charger and PSU
Guitar Overdrive circuits
Electronic I CHING Detector
Fuzz box 5
Hi-fi-expander-with-de-emphasis
Time-Out Circuit
Solar Powered Remote Control Surveilance
DIY Welder Control Board
burning hex files using usbasp
vary Precise Lc Meter
Railway circuits
LED display driver circuit a



Top