Kit 7: Surprise 2

What’s the surprise? The surprise is that such a spectacular display of colour can come from such a plain-looking light-emitting diode. When switched on, the l.e.d. gradually changes colour over about 30 seconds and then the sequence repeats. Placing a cut-glass tea light holder or tumbler over the l.e.d. enhances the display. Please have a look at a working version of the "L.E.D. Surprise 2" circuit on the Irby Electronics YouTube channel. When this circuit was tested, a set of Duracell Plus Power batteries was still producing a good light output after 140 hours of continuous use. The circuit is made on track board (approx. 6 cm x 2 cm) and requires 3 x AA batteries (not supplied). Soldering is ESSENTIAL for this kit. Please see Kit 1 for an alternative version of this circuit constructed on foam board. These tools are needed to make this kit (not supplied): small pliers for bending component leads, small wire cutters for cutting component leads, small, low power soldering iron, e.g. 15 watt, 18 watt or 25 watt. Please read the safety warning in the About Irby Electronics section before ordering a kit.