• on Computer/Software/Internet
  • Published in issue 7/2009 on page 17
About the article

Pseudo Fan

The aim of this circuit is to trick a so-called ‘intelligent’ fan controller that a fan is connected to it when it is not. This may sound like madness, yet there is method in it.
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Extra info, Update


• simulates a fan of any size(!)

• pseudo-rotation frequency adjustable from

15 Hz to 150 Hz

• current consumption less than 5 mA

• operating voltage

R1 = 47k?
P1 = 470k?, small, upright
C1 = 100nF
C2 = 10nF
C3 = 47?F 16V
D1 = SB140 (Schottky diode)
IC1 = NE555
Branched cable with 3-way plug
PCB # 090445-1
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