Thread: Limit desk fan
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Old 1st Sep 2019, 8:07 pm   #13
Join Date: May 2008
Location: Derby, UK.
Posts: 7,619
Default Re: Limit desk fan

Anything of a few hundred kΩ will be fine; just watch the power dissipation (which is just V*I, and I=V/R; you can do it in one step as P=V**2/R). A 470kΩ resistor would be dissipating about 0.11W, if the motor went short and left the full 230V across the R||C network.
If I have seen further than others, it is because I was standing on a pile of failed experiments.
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