I call for a power supply 12vdc at 200 ma. Can I use a 600 ma supply?

Answers: Yes
As long as the voltage is 12 V DC you can use a 600 mA power supply. The device will just draw as much as it wishes.

Absolutely, as long as it is 12vdc. Whatever you are powering will only draw the current it requirements. When referring to amperage, bigger input is always better.

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