Anyone good with electronics/circuits?

Discussion in 'General Chat' started by otc, Nov 15, 2011.

  1. otc

    otc Senior member

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    I want to build a little box with a timer that runs a fan for a few hours and then shuts off.

    I'll be using a 120mm computer case fan at something between 7-12V...right now, I can run it off a 9V battery but they don't have a ton of stored energy and I have to remember to turn it off. My design will probably use 6 AA/AAA batteries to spin the fan at a medium speed (although this might be too much voltage for the timer circuit).

    I need to design a circuit that will use some sort of timer chip to run it for an arbitrary amount of time (6-12 hours...doesn't even need to be adjustable) and then shut off. I am comfortable soldering and reading circuit diagrams but I am not familiar with the sort of ICs that do this. I've used 555 timers but I don't think they are right for this situation.

    Anyone have any IC/circuit suggestions? Know any other good forums where I could pose this question?
     
  2. wootx

    wootx Senior member

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  3. otc

    otc Senior member

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    Ooh thanks, that looks like it does almost exactly what I want (except it does it backwards). If I flip the relay around, it should do what I want.

    It looks a little complicated but I think I could put it together.
     
    Last edited: Nov 16, 2011

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