here for Electronic
Circuits main page
for greeting cards Click here for Circuit Diagram.
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
If you use the piezo, then it can be connected
directly between the output pin 1 and ground pin 3 without
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.
a Circuit | Newsletters
Forum | Links
All the information present on this site are for personal use only. No commercial
use is permitted without the prior permission from authors of this website.
All content on this site is provided as is and without any guarantee on any
kind, implied or otherwise. We cannot be held
responsible for any errors, omissions, or damages
arising out of use of information available on this web site. The content in
this site may contain COPYRIGHTED
information and should not be reproduced in any way without prior permission from
2011 - All rights reserved.