Hello Guest, Welcome to Apnea Board !
As a guest, you are limited to certain areas of the board and there are some features you can't use.
To post a message, you must create a free account using a valid email address.

or Create an Account


New Posts   Today's Posts

Finally! Somebody is posting a battery/DC power thread to ApneaBoard!
#1
OK -

I see where PR has out a DC cord that hooks up to the Dreamstation units and an automotive cigar lighter plug.

There has been talk/speculation as to the requirement for a mystery signal along a third wire as a requirement to make a Dreamstation run.

Anybody have experience with this? I ask because the PR system doesn't make you go through a brick - it is a simple two wire cord assembly. Or looks like it. Has anyone gotten the cord or taken it apart to see what makes it tick? It seems if it is really just a two wire cord (with two inexplicably ginormous RF chokes), then what/where is the mystery third conductor signal coming from? And if it is maybe a resistor molded in the plug end, shouldn't I just be able to run off a battery/DC source if I cut off the cigar plug and the RF choke on that end and replace with a PowerPole connector to hook up to my battery backup???

OMMOHY

[attachment=2595]
Post Reply Post Reply
#2
I bought the DreamStation dc cable and it's got a 20K ohm resistor molded in the plug. The resistor is connected between the center pin and the inner barrel (+12V). Outer barrel is ground.

Some testing with a power supply and a decade box shows the DS needs to see between 18.9K to 26.2K to power up and run without an error screen. The blower will not start with the wrong resistance.

You're right that the cable is just two-wire zipcord with humongous beads and you should be able to chop off the cigar plug and attach the powerpole connector. The cigar plug has a fuse, led, and resistor.
Just my personal opinion. My posts are not medical advice or a statement of fact. Please consult a qualified physician or other qualified medical personnel. Please comply with all applicable laws, codes, regulations, and protocols.
Post Reply Post Reply
#3
Well, not the greatest thing (and actually, I can't see that it serves much, if any, purpose, except to force folks to buy that particular cord), but it beats having to buy a $100 brick. I wonder what would happen if I just started cutting off plasti from around the ferrite. Two half cores with plastic molded around them around the wire? Or, just cut off the plug end at the ferrite and add a PowerPole at that point!

OMMOHY
Post Reply Post Reply


#4
Well after some ruminating and reviewing the earler thread http://www.apneaboard.com/forums/Thread-...ery-Cables I was wondering what the impact would be of running a PRS1 with the cable for the Dreamstation. Yes I know that PR warns the cables are not compatible, but it seems 12 V outer gnd, inner barrel pos, same same as the PRS1, with the center pin unaccounted for.

I wonder what it would think about the center pin? NOT that I NEED it, I hope to be GTG for the next several years with what I got now, but if I was a forward thinker, that could make things simpler to just cut the plug off of the Dreamstation DC cord and terminate it with PowerPoles, as if I had a Dreamstation, so that when I may get one .......

Has anyone disassembled a PRS1 and seen if that center pin goes anywhere or is just vestigial on that machine? It's a shame we can't get out hands on wiring diagrams for these machines. Or more a shame that the manufacturers make changes like this just to mess with everybody. I wonder if we might find a PRS1 DOA to do an autopsy on ....

OMMOHY
Post Reply Post Reply


Possibly Related Threads...
Thread Author Replies Views Last Post
  [Equipment] Resmed VPAP Adapt SV Internal Battery kucdavidm 3 114 12-09-2017, 07:22 PM
Last Post: kucdavidm
  [Equipment] Can I use my UK Elite power connector and plug with the American For Her machine? Apnea Infant 10 223 12-04-2017, 05:54 PM
Last Post: Apnea Infant
  Yet Another High AHI thread jwolf 4 231 11-23-2017, 09:30 PM
Last Post: ajack
  [How to] Better Thread Titles PaulaO2 5 467 11-19-2017, 09:22 PM
Last Post: PaulaO2
  Not new member but have a question [about power outage] Johnnyh14 3 205 10-30-2017, 09:00 PM
Last Post: dwd1249
  Backup power options for CPAP machines terp1984 22 1,237 10-22-2017, 03:53 PM
Last Post: OMyMyOHellYes
  [Equipment] Resmed S-9 power supply Travellingcpap 5 216 10-21-2017, 11:43 PM
Last Post: Sleepster

Forum Jump:

New Posts   Today's Posts




About Apnea Board

Apnea Board is an educational web site designed to empower Sleep Apnea patients.

For any more information, please use our contact form.