Hi Guys, i've got a power supply (one of those black plugs with a lead plugs into the mains) that has an output of 12v (which i need) and a current of 1.25A (which i dont need) the device i'm powering requires 0.4 A.

 

The devices last power supply actually outputted 0.8A, Could a hike to 1.25 be toooo much and if so, how do i get the 1.25A down to 0.4, me thinks i need something in the +ve wire, like a resistor?. Been far to long since i did electronics as a BAe apprentice...

 

Any one help?

 

Thanks

 

 

R

What is it your trying to power? if it needs 12v but at lower amps then a resistor will drop the voltage and not the amps to the unit.

does the current rating not mean it will handle up to 1.25A

Yes, that means it will supply up to 1.25A, so if your requirement is 0.4A then it's fine.

The device is a small digibox, if that helps, somethings gone wrong with the existing power plug as its dropped to only 8v

Yes, that means it will supply up to 1.25A, so if your requirement is 0.4A then it's fine.

 

Thats handy to know..i thought thats what it gave out..

 

cheers