I have an RGB LED controller that is mostly a black box to me (I assume it's using PWM to produce color transitions). It's connected to an assortment of common anode RGB LEDs (they're all tiny PCBs with the LED chip + a resistor connected to each cathode). They are all connected to the controller in parallel.
Why is it that when I take one of the LED modules and disconnect only the anode (positive) wire, it will continue to dimly glow?
My beginner-level brain can't figure out how that could ever be possible. What could be happening in the controller that could result in this? Some sort of induced current even though this is a DC circuit? Could it be related to the PWM signals produced by the controller? Magic?