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How does the trigger of a typical modern multi speed drill (maybe Ryobi for example) work? Is it just a potentiometer? Or is it more involved?

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I opened a Ryobi type of cordless drill. The control appeared to be a potentiometer connected to a PWM circuit module which varied the duty cycle of the power applied to the motor.

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    $\begingroup$ Ahh, a true engineer :-). Never look up a datasheet when you have an excuse to take something apart! $\endgroup$ – Carl Witthoft Jun 22 '17 at 14:36
  • $\begingroup$ Oh yes, some of us were taking things apart before we could read : note no mention of getting them back together again.... $\endgroup$ – Solar Mike Jun 22 '17 at 17:10

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