A simple high quality 12Volt 100Amp Power Supply- Part1 - Page 105 - RC Groups
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Jun 26, 2012, 12:02 PM
Registered User

Increasing voltage of DPS-835AB

Xandrios suggested grounding pin 17 to ground. Someone use a 1.2K resistor. This increases the voltage from 12.1 to 13.1 but regulation was extremely poor. Load with 2 amps, and the voltage drops to 11.99.

Without resistor, voltage is 12.1; load with 2 amps, the voltage drops to 12 volts.
Any way to increase to 13.8volts easily?

July 7, 2012
Reread Xandrios post again. He mentioned close connections to the motherboard.
Removed all molex signal and power connectors. Reconnect 1.2k ohms from pin 17 to ground. Got 13.14 volts.
Now tested with 1A, 2A, 5A and 10Amps load, perfect regulation. Voltage remained at 13.14.
Some power is reduced for ham radio but not too bad compared to 12.14.
Thanks to Xandrios and all.
Last edited by cslim; Jul 07, 2012 at 07:39 AM. Reason: Post the retested result.
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Jun 26, 2012, 08:14 PM
Registered User
Hi Randy,
I just ordered a used DELL DPS-500CB A for use with my 100W HF transceiver.
Can you kindly guide me around the various mods that you were able to do on this unit ?
My aim is to use it as a back-up 12v DC PSU to power my 100W HF transceivers.
Could you please tell me the procedure to increase the voltage to 13.8v DC ? Ideally, I'd like to arrive at 14v DC by tweeking/moding the unit.
Also, what is the RFI suppression technique that you are using to avoid EMI noise ? Just a toroidal choke or something more elaborate ?
My e-mail ID at GMAIL.COM is "on3rt.ravi"
Thanks in advance ... best 73S !
Ravi ON8RT
Jun 26, 2012, 11:58 PM
Registered User
Hi all, Im new on the forum, my excuses if Im posting at the incorrect place, I am looking for info about how to power up my DPS-460 EB.
Tks in adv!
Jun 27, 2012, 08:44 AM
xandrios's Avatar
Hey darthmaull

Can you shoot us a pic of the pins on your DPS-460 EB.
Jun 28, 2012, 07:00 AM
xandrios's Avatar
Hey darthmaull.

Jointer may have already found the pinout for your DPS-460EB..

Jun 28, 2012, 03:50 PM
Registered User
Hi, thanks for your replies..here are some shoots of my DPS-460EB
Last edited by darthmaull; Jun 28, 2012 at 03:54 PM. Reason: Add pictures
Jun 28, 2012, 04:38 PM
Registered User
Originally Posted by racerxky
Yea. I looked in the other thread and there is info but not for the supplies specifically in this thread. And xandrios is right, these are somewhat intractable. 3 of the holes in the PCB that you put screws through connect to the DC ground. Luckily, the standoffs in the case can be removed and the case does a good job of holding the PCB in place.

This is what I did:

Attachment 4012510
Use a hammer and a block of wood with a hole in it to knock these 3 standoffs out of the case. You'll probably have to beat the case back into shape a bit.

Attachment 4012511
Install a piece of hard thin plastic as a safety shield and to give the rubber feet something to stand on.

Attachment 4012512
Put 2 rubber feet on the bottom of the PCB. I had these from another project. The height is critical, too much and the case wont go back together, too little and the PCB can flop around.

My meter says there is no path between any of the 12v contacts and the case. There is connectivity between the power plug ground and the case. I think that means the DC ground has been successfully floated. I believe that's a first for the 580 PSU.
are these the same units HP Proliant DL580 G3 HSTNS-PA01 Power Supply Unit 406421-001 337867-501 if so did your method work on removing the dc ground buy just isolating the 3 post?


Jun 28, 2012, 05:51 PM
xandrios's Avatar
Hey darthmaull.
Your DPS-460EB looks very similar to these:


and here:


It looks like you just need to connect pin 1 to pin 4 topside.

Use a 500 ohm resistor if in doubt.
Jun 28, 2012, 07:10 PM
ancora imparo
jj604's Avatar
Don't forget guys. If you find a method that works for a supply that is not already on the sticky thread, be sure to post a link to the info in that thread.



Jun 28, 2012, 07:40 PM
Registered User
Hi Xandrios, You really make my day ! :-) I tied together top pins 1 & 4 and green light went up...12.33 VDC available now

Jun 29, 2012, 12:28 PM
Assistant Pitman's Helper
R.Gareau's Avatar
I was wandering if anybody would have the pin out information on these power supplies

Delta Electronics DPS-660AB
Thanking you all in advance
Jun 29, 2012, 01:16 PM
xandrios's Avatar
Hey R.Gareau.

I can't see the rest of your PSU from the pics.
Does your DPS-660AB look similar to the DPS-600RB??

If so then check to see if any of the pins match up even before you try to power it up.
Plug your DPS-660AB into the wall and check to see if you get 5V from pin C3 and pin D3 as shown below.
You may get a blinking green light when AC input is present.
Pin B3 may be shorter than the rest.

Last edited by xandrios; Jun 29, 2012 at 01:48 PM.
Jun 29, 2012, 01:56 PM
Assistant Pitman's Helper
R.Gareau's Avatar
Yes it does look just like it except the handle is differrent. I'm back at work now so I cant test the 5V but I do remember 2 pins being shorter C3 and B4.

Jun 29, 2012, 03:04 PM
xandrios's Avatar
If so then either pin C3 or B4 will be the PS Kill pin.
Jun 29, 2012, 03:49 PM
Registered User
Originally Posted by xandrios
Next would be to connect a diode in parallel with output to prevent reverse voltage. The diode should be rated to at least the power supply rated output voltage and output current.
Thanks for the reply. I think at this point I'll just avoid adding or removing chargers with the supply powered up.

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