Control fan speed with photocell

Discussion in 'The Projects Forum' started by valerie, Jan 13, 2011.

  1. valerie

    Thread Starter New Member

    Jan 13, 2011
    1
    0
    Hi,
    I have a DC 12V fan.
    It has two wires.

    I want the speed of the fan to be controlled by a photocell. Is this possible? And if so, how?

    I have a circuit now. I'm using the 555 (intergrated circuit). I have the photocell and the fan connected on the other side. When I connect the battery, the fan works but as I move my finger up and down to change the light value received by the photocell, this does not affect the speed of the fan. However, there is a fluctuating noise coming from the fan as I do this.

    Thank you for your help,
    Val
     
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