Do I need to use the DC-12 for my S8

After an absence of a few years from this fine board after a little bout with cancer, I seem to have become a real chatterbox of late.

I am a retired engineer, including power supply. I have meticulously researched the ResMed DC-12 converter for my S8 Autoset. I find NO plausible reason for spending $100+ dollars for this ugly looking device. Any explanation from ResMed why you must use their device is without basis, in my opinion.

I know ResMed wires their connector backwards from the generally-accepted standard of pin positive. I know you can fry the internal solder-in fuse if you don't know this. I know 12 VDC won't power the heating element. Other than that, is there ANY reason you experts know of to not use a standard 12 VDC cigarette lighter adapter wired correctly to power the S8? I have a couple of these adapters in my drawer, and cannot my part with with my hard earned money for an overprice piece of proprietary hardware.

Thoughts from the board?

Al

akeegan wrote:I know ResMed wires their connector backwards from the generally-accepted standard of pin positive.

There is no convention for barrel connectors, its about 50/50 across the global commerial low voltage DC market on whther the centre pin is + or -

akeegan wrote:Other than that, is there ANY reason you experts know of to not use a standard 12 VDC cigarette lighter adapter wired correctly to power the S8?

There are several threads on this here already.

A DC-12 makes battery operation of an S8 pretty much idiot-proof. If you think you don't need idiot-proofing, you can wire up your own connection, but don't complain if you run into problems.

Whatever you wire up has to be heavy enough to handle the current, I'm guess guessing @ 2 amp, too small a wire will cause voltage drop, and fuse it too. Jim

billbolton wrote:

akeegan wrote:I know ResMed wires their connector backwards from the generally-accepted standard of pin positive.

There is no convention for barrel connectors, its about 50/50 across the commecrial low voltage DC market on whther the centre pin is + or -

akeegan wrote:Other than that, is there ANY reason you experts know of to not use a standard 12 VDC cigarette lighter adapter wired correctly to power the S8?

There are several threads on this here already.

A DC-12 makes battery operation of an S8 pretty much idiot-proof. If you think you don't need idiot-proofing, you can wire up your own connection, but don't complain if you run into problems.

I beg to differ. Maybe there isn't a barrel connector polarity standard in Australia, but in the US it leans to pin positive.

From the following link:

http://en.wikipedia.org/wiki/DC_connector

I excerpted the following:

"Cylindrical plugs generally have an insulated tip constructed to accept insertion of a pin. The outer body of the plug is one contact, most often but not always the negative side of the supply. A pin mounted in the socket makes contact with a second internal contact. The outer plug contact is often called the sleeve, while the inner one is called the tip."

I didn't know it was a requirement to spent a lot of time researching threads to be able to post.

And I never complain; it's a sign of weakness.

akeegan wrote:

billbolton wrote:

akeegan wrote:I know ResMed wires their connector backwards from the generally-accepted standard of pin positive.

There is no convention for barrel connectors, its about 50/50 across the commecrial low voltage DC market on whether the centre pin is + or -

akeegan wrote:Other than that, is there ANY reason you experts know of to not use a standard 12 VDC cigarette lighter adapter wired correctly to power the S8?

There are several threads on this here already.

A DC-12 makes battery operation of an S8 pretty much idiot-proof. If you think you don't need idiot-proofing, you can wire up your own connection, but don't complain if you run into problems.

I beg to differ. Maybe there isn't a barrel connector polarity standard in Australia, but in the US it leans to pin positive.

From the following link:

http://en.wikipedia.org/wiki/DC_connector

I excerpted the following:

"Cylindrical plugs generally have an insulated tip constructed to accept insertion of a pin. The outer body of the plug is one contact, most often but not always the negative side of the supply. A pin mounted in the socket makes contact with a second internal contact. The outer plug contact is often called the sleeve, while the inner one is called the tip."

I didn't know it was a requirement to spent a lot of time researching threads to be able to post.

And I never complain; it's a sign of weakness.

You also nee to consider that down under the water gore down a hole the other direction, maybe that is what gave them the idea to put the positive lead to the outside, or maybe they like the profit from repairing machines those that take for granted, screw up. Jim

Measure twice, cut once, but keep a fire supressor handy.

Goofproof wrote:

akeegan wrote:

billbolton wrote:

akeegan wrote:I know ResMed wires their connector backwards from the generally-accepted standard of pin positive.

There is no convention for barrel connectors, its about 50/50 across the commecrial low voltage DC market on whether the centre pin is + or -

akeegan wrote:Other than that, is there ANY reason you experts know of to not use a standard 12 VDC cigarette lighter adapter wired correctly to power the S8?

There are several threads on this here already.

A DC-12 makes battery operation of an S8 pretty much idiot-proof. If you think you don't need idiot-proofing, you can wire up your own connection, but don't complain if you run into problems.

I beg to differ. Maybe there isn't a barrel connector polarity standard in Australia, but in the US it leans to pin positive.

From the following link:

http://en.wikipedia.org/wiki/DC_connector

I excerpted the following:

"Cylindrical plugs generally have an insulated tip constructed to accept insertion of a pin. The outer body of the plug is one contact, most often but not always the negative side of the supply. A pin mounted in the socket makes contact with a second internal contact. The outer plug contact is often called the sleeve, while the inner one is called the tip."

I didn't know it was a requirement to spent a lot of time researching threads to be able to post.

And I never complain; it's a sign of weakness.

You also nee to consider that down under the water gore down a hole the other direction, maybe that is what gave them the idea to put the positive lead to the outside, or maybe they like the profit from repairing machines those that take for granted, screw up. Jim

Measure twice, cut once, but keep a fire supressor handy.

Ahh... The Coriolis affect strikes again. I've got too much counter-clockwise topspin on me.

Measure with a micrometer, mark with a grease pencil, cut with an ax. Dad was a carpenter.

akeegan wrote: Measure with a micrometer, mark with a grease pencil, cut with an ax. Dad was a carpenter.

Better yet don't buy Re$med$ ....lol.

GumbyCT wrote:

akeegan wrote: Measure with a micrometer, mark with a grease pencil, cut with an ax. Dad was a carpenter.

Better yet don't buy Re$med$ ....lol.

Yeah, but I hear the new Resperonics are garbage. Don't have an opinion on this yet - just heard it from my DME who used to carry the line.

akeegan wrote:Yeah, but I hear the new Resperonics are garbage. Don't have an opinion on this yet - just heard it from my DME who used to carry the line.

You are still green IF you believe your DME. For the record I think they both make good machines and certainly think the Re$med makes a better mask. Yet I don't use their masks.

I just don't care for the way Re$med milks anyone they can and they are limiting shipping out of the US for US based Co.'s. Re$med is also the reason that "CPAP Auction" was shut down.

Did I miss anything?

Why does anyone want to feed a monster?

GumbyCT wrote:

akeegan wrote:Yeah, but I hear the new Resperonics are garbage. Don't have an opinion on this yet - just heard it from my DME who used to carry the line.

You are still green IF you believe your DME....

You're right, my "...heard it from my DME..." statement was a faux pas. I retract the statement.

Please advise. Hooked 12V to the unit and now it doesn't work. Before seeing this post, I made a L-size coaxial connector with (+) going to the tip. Previous postings in this thread suggest that the tip should be (-). The internal fuse may have blown. Anyone know what rating it is?

Both AC and DC do not work now. $#%#@$%^#$%! ResMed could learn something about modern product design and reverse polarity protection.

Proprietary design.
Dirty tricks is par for the course--and this company--
All the S9's are 24 volt.
Then again, all the XM radios are 4 volt--just odd enough you HAVE to use their power supply.
One more plus for Devilbiss.

Andromeda wrote: Please advise.

I would never think of doing anything with a Re$med w/o checking w/bb