PWM+capacitor is not an adjustable DC supply. You also need an inductor to do that: https://electronics.stackexchange.com/a/31714/15654 https://electronics.stac

PWM+capacitor is not an adjustable DC supply. You also need an inductor to do that: https://electronics.stackexchange.com/a/31714/15654 https://electronics.stackexchange.com/a/31714/15654 Of course the wires have resistance so it would technically “work” as an RC filtered PWM until it overheats. PWM dimming means turning the LEDs on and off without any smoothing.