V12|V12:
The speed controller lead is yellow. I placed a pot between it and the ground lead (black lead). It does not need to be large watt unit. My electronics knowledge is very limited but let me explain in the terms of one who knows not.
The Comair fan has a lot of electronics inside the fan that we can’t see. This electronics performs all of the extra functions for the fan. The fan speed controller circuitry (like a reho bus) for the most part is low power. Look at the resistors in a reho bus they are low watt, ¼ or ½ watt units, the same goes for the pot that we rotate to select the speed we want. Now these low power parts do their thing and talk to the high power voltage regulator that is connected to it and tell it to change its output voltage to what we wanted. So, the pot on the speed controller lead can be a low watt value, and that’s why I selected a 5K ohm ½ watt unit. If you placed a pot on the 12VDC lead I think it would have to be a high watt unit like the one you were talking to the RS guy about.
Now an electronics expert may come along and punch all kinds of holes in my explanation, and give a better description.
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Have fun, FuzzyFace
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