Resmed S9 DC adapter parts

Has anyone built their own DC Inverter for the S9? I had a PDF on the parts etc, but cannot find it.

rmintsi wrote:Has anyone built their own DC Inverter for the S9? I had a PDF on the parts etc, but cannot find it.

I've not seen one. I went with Respironics to avoid all that proprietary bs. You can prob pick one up on Craigslist and use straight 12V.

I haven't ever seen any documentation on the mystery 3rd wire that's needed to make the machine work. Or any source for the power connector.

Let us know if you find the documentation.

archangle wrote:I haven't ever seen any documentation on the mystery 3rd wire that's needed to make the machine work. Or any source for the power connector.

Let us know if you find the documentation.

well, I'll say that two of the wires are power, and one's a sense line.

based on the size of the traces that are on the circuit board, two of the wires are power, one is sensing.

palerider wrote:

archangle wrote:I haven't ever seen any documentation on the mystery 3rd wire that's needed to make the machine work. Or any source for the power connector.

Let us know if you find the documentation.

well, I'll say that two of the wires are power, and one's a sense line.

based on the size of the traces that are on the circuit board, two of the wires are power, one is sensing.

From the board you should be able to tell which pin is 24V, which is Ground, and which is the sense pin. That would be a start.

Guest wrote:From the board you should be able to tell which pin is 24V, which is Ground, and which is the sense pin. That would be a start.

well, there's red, black and white, inside, however, there's a tiny circuit board that the socket is soldered to, and I'm not sure how it's wired up.

palerider wrote:

Guest wrote:From the board you should be able to tell which pin is 24V, which is Ground, and which is the sense pin. That would be a start.

well, there's red, black and white, inside, however, there's a tiny circuit board that the socket is soldered to, and I'm not sure how it's wired up.

hrmph, talking to myself, again.

so, looking at the plug, wire down, the pins are ground on the left, +24 on the top/center, and the small one is a communication pin, it's got something around 3v (I think) on it, but it also has occasional digital data pulling it low... which distracted me from paying that much attention to the actual voltage.

palerider wrote:

palerider wrote:

Guest wrote:From the board you should be able to tell which pin is 24V, which is Ground, and which is the sense pin. That would be a start.

well, there's red, black and white, inside, however, there's a tiny circuit board that the socket is soldered to, and I'm not sure how it's wired up.

hrmph, talking to myself, again.

so, looking at the plug, wire down, the pins are ground on the left, +24 on the top/center, and the small one is a communication pin, it's got something around 3v (I think) on it, but it also has occasional digital data pulling it low... which distracted me from paying that much attention to the actual voltage.

The blower unit does use some sort of signal to determine whether the power supply is the 30W or 90W, so there is some actual information coming from the power supply.

Sounds like the net outcome is you're locked into buying the adapter and power supply from ResMed. I guess the only way to know for sure is to try rolling your own supply and figuring out what voltages or signals on the wire cause what effect. Or analyze a 30 W, 90 W, and DC-DC supply.

Your observation of digital signals makes me think that rolling your own supply or DC adapter would be difficult.

I had a friend who had a Dell laptop and he said it had some digital signals on the power supply from the brick and wouldn't work with anything but genuine overpriced Dell power supplies.

This kind of copy protection is getting way too common these days.

archangle wrote:

palerider wrote:

palerider wrote:

Guest wrote:From the board you should be able to tell which pin is 24V, which is Ground, and which is the sense pin. That would be a start.

well, there's red, black and white, inside, however, there's a tiny circuit board that the socket is soldered to, and I'm not sure how it's wired up.

hrmph, talking to myself, again.

so, looking at the plug, wire down, the pins are ground on the left, +24 on the top/center, and the small one is a communication pin, it's got something around 3v (I think) on it, but it also has occasional digital data pulling it low... which distracted me from paying that much attention to the actual voltage.

The blower unit does use some sort of signal to determine whether the power supply is the 30W or 90W, so there is some actual information coming from the power supply.

Sounds like the net outcome is you're locked into buying the adapter and power supply from ResMed. I guess the only way to know for sure is to try rolling your own supply and figuring out what voltages or signals on the wire cause what effect. Or analyze a 30 W, 90 W, and DC-DC supply.

Your observation of digital signals makes me think that rolling your own supply or DC adapter would be difficult.

I had a friend who had a Dell laptop and he said it had some digital signals on the power supply from the brick and wouldn't work with anything but genuine overpriced Dell power supplies.

This kind of copy protection is getting way too common these days.

I'm designing a power supply for the Resmed A10 that might solve some of the issues above:
viewtopic/t112270/Make-ResMed-A10-24VDC ... mping.html

verbatim wrote: I'm designing a power supply for the Resmed A10 that might solve some of the issues above:

oh, DO shut up.

palerider wrote:oh, DO shut up.

Based on your writing, and your almost complete lack of ability to add any value to a thread, I'm guessing you stopped your education at, oh, around the fourth grade?

It's either that, or your'e just a miserably unhappy value less person in real life.

Try ADDING some value some time to a thread.

Since you're education is lacking, I'll put a "plus" sign in front of all my replies to you (+).

This will indicate that all I'm asking you to do is ADD (+) value with each of your posts.
Like I did above in mine.

Let's see if Palerider is actually capable of adding ANY value whatsoever in his next post.

(+)

[quote="verbatim

Since you're education is lacking, I'll put a "plus" sign in front of all my replies to you (+).

This will indicate that all I'm asking you to do is ADD (+) value with each of your posts.
Like I did above in mine.

Let's see if Palerider is actually capable of adding ANY value whatsoever in his next post.

(+)[/quote]

It's not going to work b/c it's a passive approach. You need to fight back tooth for a tooth. Copy the Presidential Candidates Approach.

avi123 wrote: It's not going to work b/c it's a passive approach. You need to fight back tooth for a tooth. Copy the Presidential Candidates Approach.

The problem with Palerider is that (it) hasn't grown up yet, mentally.
(I don't know if Palerider is male or female so I'll just call it an it because it adds no value anyway.)
Basically, Palerider is a troll who is stunted at about the elementary school level in mental development.

The problem with dealing with such trolls is that they will destroy a thread no matter WHAT you do - because that's what trolls like it absolutely love to to.
They THRIVE on destroying the content of a thread.
It makes them feel ALIVE to destroy a thread.

It is no different than any other troll.

There are basically three ways to deal with the troll:

• Don't feed the troll (in which case, it will eventually go away - but it will destroy the thread before doing so - because THAT is what energizes it)
• Mock the troll's very words (this is so easy to do that you'd think the troll would get it - but remember - the troll is stunted in development - so the mockery is only seen by others - not by the troll itself)
• Get into heated pitched battles with the troll (which is EXACTLY what the troll wants - since the troll feeds off of the attention paid to it).

As you noted, the troll will ruin the thread in any case.

Just as you can't stop a rampaging dog from ruining the exquisite dishes in the China shop, no matter what you do, it will ruin any thread it touches.
That's because it takes no intelligence to ruin a thread - which is all the troll can do.

It takes intelligence to ADD VALUE to a thread - which is what my prior posts and yours attempt to do (and those of Pugsy, Capriloki, etc.); but it takes ZERO INTELLIGENCE to ruin a thread.
That's all the troll "can" do (because it's not intelligent enough to add any value).

One other thing, common to such trolls, is that they must have the last word - and - again - like a crying child in an airplane where others are trying to get something done - you have to let the troll have the last word.
Which it will.

verbatim wrote:Try ADDING some value some time to a thread.

Since you're education is lacking, I'll put a "plus" sign in front of all my replies to you (+).

you want added value? how 'bout this:

even though you believe my education is lacking, at least I know the difference between "you're" and "your"...

perhaps it's your education that is lacking?

there, see? added value, information on which word to use in a sentence so as not to appear illiterate.

palerider wrote:there, see? added value, information on which word to use in a sentence so as not to appear illiterate.

Um... uh... yeah.

That's a bucket load of on-topic added value you just added there.
Yes sir eee!

You sure are a smart one.
Whoooeeee!

I gotta hand it to ya, ole' pale rider.
Can you add even MORE on-topic value than that?

Or have you shot your entire load already?