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Old 05-14-2018, 01:28 PM   #1 (permalink)
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Default HP DPS-1200FB-1 A voltage adjustment

I'm following this post (previously floated two DPS-1200FB PSUs successfully) to float the more efficient version of the same PSU (hence the "-1 A" in the title):
https://www.rchelination.com/index.p...b-power-supply

In the attached pic, in the "-1 A" version of the PSU, I see 5 potentiometers - how do I know which one adjusts the voltage?

Another difference is that one has to use a 330Ohm 1W resistor instead of the 1K 1W resistor like in the article to power it on... has anyone tried this more efficient PSU?
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Last edited by prokyon; 05-14-2018 at 10:40 PM..
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Old 05-18-2018, 02:58 PM   #2 (permalink)
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Does anyone know where I can get this information? I doubt HP support would help since these PSUs were never intended to be taken apart. How can I figure out which pot adjusts the voltage? Or should I just leave it?
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Old 05-22-2018, 09:21 PM   #3 (permalink)
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I figured it out by trial and error - for anyone else who's using this same PSU, it's pot number 4 from the left and I got max Voltage to be 12.53V on one PSU and 12.60V on the other - so not quite perfect and the charger will buck-boost towards the end of the charge, but it's close enough. These PSUs do seem to run cooler than the non-94% efficiency ones which I have.

Oh, and 330 Ohm 1 Watt resistor is enough to power them on.
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