gmcjetpilot
Joined: 04 Nov 2006
Posts: 170
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 Posted: Fri Jan 18, 2008 11:35 am Post subject: Controlling defrost fans (PS) |
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Here I looked up some ideas:
http://solorb.com/elect/pwm/pwm1/
http://www.electronickits.com/kit/complete/motor/ck1400.htm
http://www.electronickits.com/kit/complete/motor/k166.htm
http://www.bakatronics.com/shop/item.asp?itemid=581
I think ON-OFF switch is fine. You will probably NEED
all the air you can get from a little FAN.
I suggest you get LARGER fans than what you have.
You will get very little air from those tiny fans. Have you
felt the air off of them? You will likely get a small 1.5"
spot above the fan clear and that is it. That is not too
great of a vis.
I am debating putting any fan in at all.
My back up is a cig lighter portable ceramic heater/fan
window defroster heater and just throw it up there on
the glare shield on the ground to get it defrosted. I might
put some vents to allow the cabin heat & radio heat to
rise up with natural convection. I'm thinking weight.
I am not saying don't do it but I would get much bigger
fans, and as far as speed control? I'd go with ON/OFF.
You can add speed control later if you need or want it.
George
Be a better friend, newshound, and [quote][b]
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