Reply To: Dewalt screen speed control

#9163
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Leo69
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I’m not positive but pretty sure the hf speed control uses a triac circuit with a variable resistor to control the chopping frequency. A triac is two rectifiers back to back so it would function kind of like an adjustable version of what’s described in the link.the hf version is a better implementation though and just as cheap as building yourself, especially if you have a 20% off coupon