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12 volt automotive fan speed controller

Discussion in 'Electronic Components' started by mark krawczuk, Nov 25, 2007.

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  1. hi, i am after a basic type schematic to controll the speed of a 12 volt
    dc automotive cabin fan .

    seems to be a bit of a problem in these saab`s.

    any schematic using a mj11032 or mj11016 darlington would be good. if
    not any electronic speed controll schematic will be fine.
    the original darlington is rated at about 25 amp , seems a bit excessive....
    these darlingtons i have are rated at 30 and 50 amp.

    thanks, mark k
     
  2. 556? (Dual 555 timer). Astable triggering a monostable, change monostable
    width to get PWM output. Also, a power MOSFET will be more efficient than a
    Darlington.
    I'm not sure which speed is best for the astable, I'd choose either a few
    tens of KHz, or a few tens of Hz, the lower setting is probably the better
    one. Either way you want to avoid hearing it.
     
  3. Marra

    Marra Guest

    A pot driving a MOSFET would work best and simplest.
    The MOSFET would need a heat sink.
     
  4. Jamie

    Jamie Guest

    That may not be such a good idea if you were to use a
    fet that was only spec out for logic operations.
    You may find the wattage factors on these fets are much
    lower than you would think with the currents they can handle.
    it's all about the "ON" resistance for the DS... if you
    were going that route. You might was well just stick to a
    bipolar.

    A Fet can be used, simply by using a 555 Timer and vary the
    duty cycle driving the gate..
     
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