Brand new to cpap (overloaded with information) Start where?

teehee

verbatim wrote:

palerider wrote:I'm sure they're heartbroken to learn the results of your intensive engineering analysis.

I actually disagree with you that they will be heartbroken.
But, since you have so much experience with the power supply setup for the ResMed A10, would you kindly check out this diagram that I drew for how to build a suitable A10 portable power supply for accuracy?

that would be a "no", I won't play your little games, or waste any more of my time trying to get knowledge into your head.

Christine L wrote:teehee

I'm happy you found this discussion interesting because we're all here to help each other.
If you're interested in reading interesting stuff, here are the references which you might find useful that I used for the schematic below:

• ResMed Battery Manual (http://www.resmed.com/us/dam/documents/ ... lo_eng.pdf)
• Microchip Voltage Regulator Datasheet (http://ww1.microchip.com/downloads/en/D ... 22200C.pdf)
• ResMed Patent Description (http://www.google.com/patents/US20140366876)

For example, you might find this 5-pin voltage regulator circuit schematic useful for the task at hand:

palerider wrote:

verbatim wrote:that would be a "no", I won't play your little games, or waste any more of my time trying to get knowledge into your head.

Bearing in mind that the ResMed up converter introduces noise (which then has to be filtered), notice the circuit described below provides a cleaner power supply than the ResMed up converter.
Since you have far more knowledge at this than I do, please let me know if you can suggest improvements to the now-updated circuit schematic, and/or the components chosen.
That way everyone can benefit from your wealth of knowledge.

No one to talk to, little fellow?

verbatim wrote:

palerider wrote:that would be a "no", I won't play your little games, or waste any more of my time trying to get knowledge into your head.

Bearing in mind that the ResMed up converter introduces noise (which then has to be filtered), notice the circuit described below provides a cleaner power supply than the ResMed up converter.
Since you have far more knowledge at this than I do, please let me know if you can suggest improvements to the now-updated circuit schematic, and/or the components chosen.
That way everyone can benefit from your wealth of knowledge.

my wealth of knowledge suggests that in your galloping incompetence, you're going to:

• blow something up
• void your warranty
• possibly hurt yourself

and I won't have anything to do with it... I think you're a fool who knows nothing about what he's messing with.

WarmBodies wrote:No one to talk to, little fellow?

I've only been using CPAP for a couple of weeks, so, plenty of people here know far more than I do at this early stage in the game.
Since I've only known about the non-standard ResMed power-sense supply for a couple of days, it will take a while to catch up to what people like you already know about the circuitry.

As you know, we're all trying to add value to this forum, so that others who have more knowledge than we do can improve upon where we currently are in the process of learning how to power up the hugely non-standard ResMed A10 for camping purposes.

The goal is to improve our CPAP experiences, and, if making a power supply for the ResMed machine helps us accomplish that goal, then it's a worthy endeavor.
Plus, if we can't build a power supply for the ResMed A10, that would mean that we don't understand the power supply - because you have to understand it in order to build it.

To that end, I will still try to improve my knowledge level, and, to impart upon others what I've learned in the two weeks of using CPAP and in the two days working on designing its power supply.

To do my part to give back to the very helpful team of experts here, below is my updated layout for anyone wishing to build their own 90-Watt sense power supply for camping use:


And, so that others can benefit from the effort, here are matching settings on the standard-power supply Philips Respironics Bi-PAP Bi-Level 750P which match the functionality of the non-standard ResMed A10 that Kaiser input into my new machine:
- Mode = Auto
- Max IPAP = 20.0
- Min EPAP = 8.0 <---------- i.e., 8 + 2 (where the 2 is hidden) = 10 cm water
- Max PS = 3.0 <---------- the lowest it will go (bearing in mind the default Min pressure support is 2 for the 750P)
- Flex Type = None <---------- I turned Bi-Flex off where BiFlex handles timing of the inhale/exhale depending on how you breathe)
- Rise Time = 0 <---------- appears when flex type is none in order to set in/out timing
- SYSTEM = 0 <---------- I'm not using any of the Philips X1, X2, X3, X4, or X5 masks so this is set to 0
- LOCK SYS = off
- Ramp Time = 0:10 <---------- only works when you press the ramp button (which I don't need)
- Ramp Start = 7.0 <---------- this dropped from 7.5 to 7.0 when I set flex type to none (but it only matters if I hit the ramp button)
- Auto on = on
- Auto off = on
- Mask alert = on
- Humidifier = off
- Show AHI = on
- Split night = of

Here are my results from last night, which back up the claim above:

palerider wrote:

verbatim wrote:

palerider wrote:that would be a "no", I won't play your little games, or waste any more of my time trying to get knowledge into your head.

Bearing in mind that the ResMed up converter introduces noise (which then has to be filtered), notice the circuit described below provides a cleaner power supply than the ResMed up converter.
Since you have far more knowledge at this than I do, please let me know if you can suggest improvements to the now-updated circuit schematic, and/or the components chosen.
That way everyone can benefit from your wealth of knowledge.

my wealth of knowledge suggests that in your galloping incompetence, you're going to:

• blow something up
• void your warranty
• possibly hurt yourself

and I won't have anything to do with it... I think you're a fool who knows nothing about what he's messing with.

Given that I only have two weeks experience with CPAP and only two days on its power supply, I defer to your vast wealth of experience which is far greater than mine ever will be.

Since I've only spent a couple hours contemplating the power supply problem, at the moment, I only have three solutions to suggest, all of which are known to work:
1. Buy the noisy ResMed 12VDC-to-24VDC up converter and power supply adapters, and then make sure you add plenty of EMI filters to filter out the power supply noise.
2. Build the simple 90W-sensing 2.7K Ohm 3.3VDC sense circuitry, and use two EMI-free 35Amp-Hour batteries (total cost about five bucks, sans the batteries).
3. Borrow a CPAP machine that uses a standard 12VDC power supply, and simply set it up to match that of your non-standard ResMed machine

One issue, of course, is that the power requirements of the ResMed A10 depend greatly on your current settings, as shown in this abbreviated chart from the reference I quoted prior:


We all have unique strengths and weaknesses.
I post this information so that everyone may add value where they can, and so that others may benefit where they need to.

verbatim wrote: the noisy ResMed 12VDC-to-24VDC up converter and power supply adapters, and then make sure you add plenty of EMI filters to filter out the power supply noise..

you don't have a clue about how boost converters work, or what that ferrite is on the cord for, do you?

do you know what EMI means? *shaking head*

and why are acting like a pinhead and posting the same drivel in multiple threads?

palerider wrote:acting like a pinhead and posting the same drivel in multiple threads

+1

If I ever need power for tent camping, I will follow CapnLoki's advice.

palerider wrote: you don't have a clue about how boost converters work, or what that ferrite is on the cord for, do you?

I can't tell if you know how boost converters work, but I can tell you, if you're interested, that the power supply that I propose (which uses the Microchip MCP1804T voltage regulator and two 35AH 12VDC batteries) certainly has far lower EMI (almost none) than an up-converter would have, if that up converter switches a 12VDC voltage to sine waves (or, more cheaply, noisy square waves which suffer from the extremely spiky Gibb's Phenomenon, and nasty harmonics).

So, I can tell you that the solution provided by ResMed HAS to be far noisier, in and of itself, than that which I propose (simply because the ResMed-provided up-conversion solution is inherently noisy and in dire need of low-pass filters because the up-convert itself is GENERATING noise!

However, having said that, most of the unwanted high-frequency noise is just as likely going to come from the ResMed machine itself, which is the same in both cases.
The $64 question, of course, is how is the machine AFFECTED by that high-frequency noise (that the ResMed equipment alone generates).

palerider wrote: do you know what EMI means? *shaking head*

EMI is absolutely meaningless if it doesn't adversely affect the equipment's operation; and it's extremely meaningful if it does adversely affect operation (or longevity).
Also, if the equipment generates no meaningful EMI (such as the circuit that I propose), then the EMI problem is likewise meaningless.
However, if the "solution" is inherently noisy (such as any switching up-converter would be), then the EMI (generated by the up-converter itself!) could be extremely important!

Therefore, what you and I need to know in order to look at the problem intelligently would be the answer to the $64 question below:
[Q] How is the ResMed A10 adversely affected by the EMI generated by the ResMed equipment (both the ResMed up converter and the ResMed CPAP machine itself)?

palerider wrote: and why are acting like a pinhead and posting the same drivel in multiple threads?

As always, you bring up a valid observation.

I have only posted to two threads on this forum, both of which have to do with the two machines that I have in my possession; but your point is valid that I should probably find an existing thread which discusses how to improve upon the noisy ResMed up converter by adding our own 270K Ohm/3.3VDC "90-Watt-Reference" center-line input.

What's important is that we all work together to better understand how the ResMed power supply works, and how the unit is adversely affected by EMI, in order to make intelligent decisions for portable use.

WarmBodies wrote:If I ever need power for tent camping, I will follow CapnLoki's advice.

You have a LOT more experience with this than I do, so, thanks for the great suggestion to search for "CapnLoki's" threads, which proves that each of us can add value in our own unique way.

A search pulls up a ton of good stuff, so I will try to find his thread on building your own power supply for the ResMed for under $5.
I haven't found that thread yet, but there is still a lot to go through, so thank you very much for that suggestion:

• Backpacking, Hiking and Camping - the PowerAdd Pilot Pro viewtopic.php?f=1&t=103170&p=1078629&hi ... 7#p1078629
• Camping out with a CPAP viewtopic.php?f=1&t=112031&p=1076600&hi ... 7#p1076600
• Battery Recomendations viewtopic.php?f=1&t=109754&p=1054075&hi ... i#p1053806
• Backup Battery viewtopic.php?f=1&t=109956&p=1051370&hi ... i#p1051273
• Battery Operated CPAP for Travel viewtopic.php?f=1&t=110563&p=1059766&hi ... i#p1059766
• Battery min. Amp hours help viewtopic.php?f=1&t=110951&p=1064774&hi ... i#p1064774
• Cpap Machine and Battery Charger viewtopic.php?f=1&t=102775&p=1067832&hi ... 7#p1067832
• Prepper question re long term power outage viewtopic.php?f=1&t=111576&p=1072402&hi ... 7#p1072402
• Need help running from battery viewtopic.php?f=1&t=112101&p=1077386&hi ... 7#p1077386

[Q] Is there a particular thread that you think is apropos for this ResMed build-your-own-sense-circuit discussion?

oh look, another mouse!

verbatim wrote:ResMed-provided up-conversion solution is inherently noisy and in dire need of low-pass filters because the up-convert itself is GENERATING noise!

too bad you've never heard of filter caps, which, completely eliminate all the garbage you're raving about... fool.

verbatim wrote:

palerider wrote: do you know what EMI means? *shaking head*

EMI is absolutely meaningless if it doesn't adversely affect the equipment's operation; and it's extremely meaningful if it does adversely affect operation (or longevity).

the FCC would not agree with your opinion... and, of course, theirs matters, while yours...

palerider wrote: too bad you've never heard of filter caps, which, completely eliminate all the garbage you're raving about... fool.

I always appreciate your technical acumen, so, whatever you can add of technical value, e.g., specs, figures, pictures, diagrams, circuit components, is always appreciated.
What would be nice is if you have the FCC report handy, which you've probably read, given that you refurbish such machines to ensure that they're still FCC compliant, after you purchase them on the open market.
Please post the FCC test procedures that you yourself follow, to certify compliance when you resell the machines to your valued customers.

palerider wrote:the FCC would not agree with your opinion... and, of course, theirs matters, while yours...

Since the opinion of the FCC matters a lot to you, it would be great if you give us a hint as to how you, yourself, certify compliance, once you refurbish, and resell your machines.
Using the same procedures you use, we can then employ them on this circuitry, when done.

In the meanwhile, while I await your detailed test procedure, I opened a separate thread showing others how to build a ResMed power supply, which those who have positive value to add are requested to contribute.
viewtopic/t112270/Make-ResMed-A10-24VDC ... mping.html

verbatim wrote: I always appreciate your technical acumen, so, whatever you can add of technical value, e.g., specs, figures, pictures, diagrams, circuit components, is always appreciated.
What would be nice is if you have the FCC report handy, which you've probably read, given that you refurbish such machines to ensure that they're still FCC compliant, after you purchase them on the open market.
Please post the FCC test procedures that you yourself follow, to certify compliance when you resell the machines to your valued customers.

there's a word that describes you well:

smarm·y
/ˈsmärmē/
adjective, informal
smarmy; comparative adjective: smarmier; superlative adjective: smarmiest

ingratiating and wheedling in a way that is perceived as insincere or excessive.
"a smarmy, unctuous reply"
synonyms: unctuous, ingratiating, slick, oily, greasy, obsequious, sycophantic, fawning

verbatim wrote:Since the opinion of the FCC matters a lot to you, it would be great if you give us a hint as to how you, yourself, certify compliance, once you refurbish, and resell your machines.

ah, you are such an idiot. but, like the average person, who thinks they're above average, I can tell that getting through to you is a lost cause, and your smarmy replies, while stupid, are losing their amusement factor.

palerider wrote:I can tell that getting through to you is a lost cause, and your smarmy replies, while stupid, are losing their amusement factor.

In other words, you fail to test your own machines (that you sell to unsuspecting customers) for the EXACT same things that you decry are the dangers in this thread?