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CPAP gets 18650ed.
#21
There is no actual communication except for overheating of the supply. It does sense for a 2.7K resistor being present to identify it is an 85W supply. Please read my previous post. This is exactly what you need to do.
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#22
I appreciate the information Norknid, but the adapter I have already does the 3.3V signal thing. It's made specifically for my cpap model. The main reason I bought it was for the compatible plug for the machine. I looked at all the parts to make a DIY unit, and buying this adapter/regulator ended up being cheaper.

I used my temporary battery and took a 2 hour nap this afternoon, with the cpap powered through the adapter. Works perfectly! I also made a diagram of all the stuff I'd like to fit in the box. No idea if it will all fit, but I'm thinking it would be great if everything I need is in the box and I just have to open it up and turn it on. Well see how that goes.

[Image: a037d52266f30bc04d1bb804479a2665.jpg]
Korishan likes this post
-Mike G
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#23
I assume you are talking about the battery converter box they sell for the CPAP. I assumed you were going direct from that 24V converter into the machine. For others who might read this thread, here is a solution that would have less to carry around. Cut the Resmed cable at a convenient location and install a three pin plug that allows you to put it back together. Then make another plug that will connect to your buck or boost converter. At the connector install the two resistor divider (prior post) that will simulate a 3.3V supply with a 2.7K ohm resistor in series to simulate a 85W AC power pack. NEVER connect the center pin directly to 3.3V as it will damage the machine. I never had any need to do this because these power packs are $10 and keep a couple spare. Mine is wired permanently to my camp with the converter 50 feet away.
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