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Thanks guys - not sure I have the technical skills to make one.
Wish I did - $35 for a controller would be brilliant
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I saw these on Ebay and most of the work is done for you. Just add a power supply and a dew heater strap, that's it. I would use a 12v, 4-5 amp power supply. I built my first controller with one similar. You don't even have to solder, just use terminal blocks and a screwdriver. Some electrical tape...done!
I prefer the 'Dew NOT' heater straps as they work very well and are cheaper than the others.
Here is the item text from Ebay for a couple of them. There are much cheaper ones too on that site:
DC 10V-60V 12V 24V 48V PWM Motor Speed Controller Power Control Switch Regulator
DC 12V 24V Motor Speed Controller Switch PWM For Car Truck Fan Heater Control AU
Cost - much less than $20
Cheers,
Damien.