A CD for Christmas

By now, loyal readers probably expect that every year around the holiday season, Elektor Electronics will come up with a playful circuit that provides an original touch in or around the Christmas tree. This year, our starting point is a compact disc.Admittedly, this is naturally nothing more than ‘fooling around’. Still, we know that most electronics enthusiasts enjoy doing something unusual for Christmas decorations. Some of the standard lighting ornaments that you can find in the department store bins are attractive enough, but everyone already has them. If you are an electronics hobbyist and you want to make a good impression, you will have to think of something somewhat original. In order to stimulate this a little bit, Elektor Electronics regularly provides some suggestions.

Resistors:
R1,R3,R5,R6 = 10kΩ
R2,R4 = 100kΩ
R7 = 2kΩ2
R8 = LDR03 (Eurodis, Bolton)
R9,R10 = 220kΩ
Capacitors:
C1,C3 = 10µF 16V radial
C2,C4 = 47µF 16V radial
C5 = 100nF
C6 = 100µF 16V radial
Semiconductors:
T1-T4 = BC327
IC1 = 4093
Miscellaneous:
K1-K5 = 2-way PCB terminal block, lead pitch 5mm
La1-La4 = miniature bulb, 12V/100mA
Surplus CD