Here's a piece of jewellery that you can be sure is unique. Go to a party and you will know that nobody else will be wearing something like the Jazzy Heart.

It's a heart-shaped LED flasher using two ICs and eight different-coloured high brigtness LEDs. It is powered by a 12V miniature battery and turned on and off by a mercury switch.

The Jazzy Heart randomly flashes eight LEDs using just two common CMOS ICs. These LEDs are arranged around the perimeter of a red plastic "heart" template (or for Christmas, a green plastic "Christmas tree" template) to pulse eight water-clear LEDs.

A special feature of the design is that all colour LEDs (red, green, blue, etc) may be used in all eight positions provided on the PC board while using just a single current-limiting resistor.

The Jazzy Heart really is jazzy. It needs to be seen to be appreciated - preferably accompanied with a fast disco beat to accompany it!

All eight LEDs essentially flash at random - but for fractions of a second, discernible patterns emerge. The LEDs may briefly whirl clockwise or anticlockwise, or bounce to and fro, sparkling in their water-clear encapsulations.