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AC To DC Power Adaptor Question

Fri Nov 18, 2005 5:06 am

I brought a AC to DC power adaptor last week for my electronic keyboard. But the power adaptor's output current is 9 Volts 1200mA and the keyboard says 9 Volts 850mA. Is is safe to use the power adaptor?
If not how do I reduce 1200mA to 850mA without buying or exchanging for another one?
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RE: AC To DC Power Adaptor Question

Fri Nov 18, 2005 5:12 am

The adaptor is able to put out up to 1200mA, that doesn't mean it will put that out all the time. It will do so if the appliance you use needs 10.8 Watts, to be precise.  Wink
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RE: AC To DC Power Adaptor Question

Fri Nov 18, 2005 5:14 am

That is quite safe.

The power supply identifies the maximum amount of current it can deliver and the device declares the maximum current it will ever draw.

The voltages must match, but the current limits (Ampere values) don't need to. Instead, the power supply should always have a higher rating than the supplied device. In your case it's actually a somewhat tight fit, but everything should be fine.
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RE: AC To DC Power Adaptor Question

Fri Nov 18, 2005 5:58 am

Just make sure the polarity on the plug that goes into your keyboad isn't reversed. On "modern" equipment there usually is a reverse-polarity protection, but if there isn't you might fry part of the equipment.

How to tell if it's reversed? There is no one-and-only answer to this. Usually there is a small symbol on the power adaptor showing if the "+" is inside or outside of the plug. It should match with what the keyboard wants.
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RE: AC To DC Power Adaptor Question

Fri Nov 18, 2005 4:44 pm

The AC flights to DC are powered by General Electrics:

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