If, like me, you have either a lot of fans running or just a few but a need to change the speed upon occasion, here's an easy way to do it.
I don't have the space for a whole gang of rheostats ( variable speed controllers) and anyway I don't really need to fine tune each fans speed. I want them all spinning fast or slow. This method will achieve the level of control I need with just one switch.
Some of you may find it useful if your PC is in your bedroom to mute the fan noise at night...
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