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Stroboscopic PC Fan

No flash in the pan

Stroboscopic PC Fan

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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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 = 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

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