I'm using a 3A 12 vdc switching power supply for my small stepper motor, and will be taking the 12 volts to a 7805 for 5v VCC to Arduino, LED driver and LED power. Since the 12v is coming from a regulated supply, should I still hang a 1 ufd cap across the input leg of the 7805? The 12 v is getting…

Filter cap needed on regulated supply?

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