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GRBL PWM Inverter Circuit > The Eccentric Workshop Blog
Here is another quick circuit – this time a GRBL PWM inverter circuit showing how to invert a PWM circuit with only three components. This works great to invert the PWM signal out of GRBL to driver a laser. As a use example, PWM_In would come from the Spindle Speed output of a GRBLDuino CNC …