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Katy, TX, USA
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I have a 12vdc p/s that I intend to use to power my arduino along with some other things (relays, transistors, etc.). It is 2200mA output. Do I need to limit this in some way to prevent damage to my arduino? Also, when using the barrell connector, which is +, inside or outside?
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No, you don't need to limit it in any way - it draws what it draws.
You'll need a meter to tell which way round the plug is connected.
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Maplin do a very neat polarity box which via a couple of LEDs shows the polarity of flying lead wall-warts.
jack
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Manchester (England England)
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Quote
Also, when using the barrell connector, which is +, inside or outside?

On the arduino the inside is the + so if your power supply is different you will have to make a swap over lead.
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