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Underwater Magic

Underwater Magic
The author of this project took it into his head to give a festive look to his swimming pool as cheaply as possible. The use of a ready-made PC PSU module to supply the power makes it possible to reduce the overall cost of this project very significantly.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Resistors
R1-R30 = 6Ohm8/3 W
Capacitors
C1 = 10nF
C2 = 1000 µF 16V radial
Semiconductors
D1 = 1N4004
LED1 - LED10 = Golden Dragon blue LB-W5KM-EZGY-35 from OSRAM
LED11 - LED20 = Golden Dragon green LT-W5KM-HZKX-25 from OSRAM
LED21 - LED30 = Golden Dragon red LR-W5KM-HXJX-1 from OSRAM
T1 à T3 = IRFI540NPBF, isolated
IC1 = AT90S8515P, Atmel, programmed with hex file from archive 071037-11.
Miscellaneous
K1 = 2 solder pins
K2 = 10-way DIL (2x5) pinheader
Heatsink for the 3 transistors (optional)
PC power supply
PCBs, ref 071037-1 (controller) and 071037-2 (LED) available from thepcbshop.com
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