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How to mod a heat gun to blow cold?
My 1500 Watt heat gun has 2 settings, 630* F and 1000* F.
The fan motor is a 17 VDC motor and there is a 4 diode bridge rectifier mounted on it. On Low the AC plug measures ~ 15 Ohms On High it measures ~10 Ohms. I would like it to run on High when heat is needed, and when I switch to Low, I would like the fan speed to remain high but with no heat (for cooling). How can I determine the fan motor current in order to calculate the appropriate dropping resistor? Am I missing something here? Is there an easy way to do it? |
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