Re: Questions about motherboard with DC input

Thanks Ben and Steve for getting back to me, and after some reading it seems like a diode or two would do exactly what I need.

For the first 10 seconds of the NAS powering up, the power draw will be up closer to the 90W mark, before settling down to ~35W (hard drive spinup). 90W/20V = 4.5A, so I was looking for a diode with a higher amp rating.

It seems like when you go larger than about 3A, diode selection changes. I was looking for a plan silicon diode, but I'm finding rectifiers, schottky diodes, zener...

Hi there,

I have an Asrock Q1900DC-ITX MB as the base of a NAS that has a DC input jack and accepts 9~19V input.

The computer only draws about 35W (at the wall) at idle, but on boot all hard drives spin up at the same time, and each hard drive draws about 20W on it's own. I have an old 19V laptop supply that's working, but I want to go bigger to add another drive in the future - so I'll need a larger power supply.

I have a ton of Lenovo 90W laptop power supplies, but they are all 20V output.

My questions are around these power supplies,...

Re: New Members - please post your introductions here

Hi everyone, from Toronto Canada here. Hoping to get some advice on a dc power supply integrated into a motherboard I have.