On Sat, 24 Nov 2007 17:37:25 +1030, "mark krawczuk"
wrote:

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




Personally, I'd recommend the 50 amp one. But regardless it may not be
optimal in any sense of the word.

I assume you want to go PWM, right? (Drive the darlington with a 555?)