12 volt automotive fan speed controller

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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

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