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Comment by louwrentius | Hacker News Reader

I haven’t found a solution for a single DC power supply I can connect to the systems. Maybe I have to solder something together myself.

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Man, I spent a lot of time looking for something like this when i bought my NAS and got annoyed with all the power bricks. Guitar players use them[0] to power their several guitar pedals, but the polarity, voltage and plug form factors are all the same, as far as I know. The various devices i have use slightly different plugs, polarities and i think not all are 12VDC.

I'm very surprised that nothing like this exists in the tech/IT space. There can't be that many form factors, voltages, etc. to deal with.

[0] I think something like this: https://www.monoprice.com/product?p_id=600062

Most guitar pedals are 9V DC but not all.

Some are 12v. Some will take 18v. I have an oddball that takes 9V AC. Some are 9V DC but flip the positive and negative. It can be a mess too.

The product you link to has outlets for 9V, 12V and 18V.

If you stuck to one PC manufacturer, I’d imagine you could have your wish. Dell laptops were the same 19V and same DC pin for years and years.

I thought USB-C PD would save us but it has a few pitfalls, apparently.

Pedal polarity is inverse of typical barrel plug polarity though.

Meanwell is the standard answer for this sort of thing; something in the SD-500 family or sized/optioned as you need. You'll have to do the connectors yourself; you may be able to find junction-post-to-barrel-plug leads of the right size and length off the shelf, but I'd be surprised, and soldering them would take less time than shopping for them.

Thank you

The HP's power-supply is 19.5V:

https://www.ebay.com/itm/235241551377

The SD-500 is available in 12V, 24V, and 48V, none of which adjust to that range:

https://www.meanwell.com/Upload/PDF/SD-500/SD-500-SPEC.PDF

Also, not sure why you're suggesting a DC-DC supply here? His input is AC.

Probably the idea is to have one big AC-DC PSU and then separate DC-DC regulators for each box from that rail.

An old PC ATX power supply is great for most things that use 5/12V. You get the 2 most common voltages for network gear, with plenty of capacity and efficiency (with a decent PSU.)

You do have to solder, though I wouldn't be surprised if one can find sata power to barrel adapters on AliExpress.

They make breakout boards that mate with the main ATX motherboard connector on the PSU. Bonus that some of them even include fuses.

And at that point, why not just chop up an old ATX case to house everything, assuming there's clearance.

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