Article

Stroboscopic PC Fan

No flash in the pan

A PC case with a side window gives plenty of opportunities for pimping the machine out with visual effects. Stand out from the crowd with the fan stroboscope circuit described here: based on an Atmel microcontroller, it drives an LED in such a way as to make the vanes of the fan seem to stop, turn slowly backwards or forwards, or suddenly change position.

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Materials

100127-PCB.pdf

100127-11.zip

Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD 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.

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PCB

Download Gerber file: 100127-1-V11

Component list

Resistors
R1 = see text
R2 = 100kOhm
Capacitors
C1 = 100nF
C2 = 1000µF 16V
C3 = 10µF 10V
C4,C5 = 22pF
Semiconductors
D1 = BAT43
D2 = 1N4007
D3 = power LED (see text)
IC1 = ATTiny2313-20PU, programmed, Elektor # 100127-41
IC2 = 78L05
T1 = IRLU120N (International Rectifier)
Miscellaneous
K1 = 3-pin pinheader
K2 = 4- pin pinheader
JP1= 18-pin (2x9) DIL pinheader with Jumper
X1 = 20MHz quartz crystal
PCB # 100127-1