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Basic Electronics » 9 VDC 1000mA to much?

October 20, 2011
by scottmc94
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I have a wall wart that is rated as a 9 VDC 1000mA. Is that too much amps to use? I know the 7805 regulates the volts to a certain level, but I didn't see any where about what the amps limits were of the MCU, etc.

October 20, 2011
by Ralphxyz
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That is potential current not what would be drawn by the mcu!!

In other words the wall wart has the capacity to put out 1000mA but the mcu would not draw (use) that much current.


October 20, 2011
by scottmc94
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Ahh, cool! Someday all the basic electronics stuff will click... I swear it will! hehe


October 21, 2011
by mongo
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You could have a 100 amp battery if you really wanted to. It would just take a very long time to run it down.

The 7805 delivers about an Amp at 5 volts, no matter what you supply it with, unless you are giving it less to start with.

So, a wall wart capable of one amp is just fine. You can go higher with no ill effects.

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