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+--- Thread: [Equipment] 12VDC adapter (/Thread-Equipment-12VDC-adapter)
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RE: 12VDC adapter - Sleepster - 10-06-2012
(10-05-2012, 10:16 PM)archangle Wrote: It's 24VDC. Look on the label for the power brick.
There's a third wire, though.
Consensus seems to be that the third wire tells the blower unit which power supply it's attached to, so it knows whether it can power the humidifier and/or heated hose.
Speculation is that it may be "interlocked" to keep you from using a non-ResMed power supply, but nobody's come up with any details.
Has anyone put a voltmeter on it to confirm that two of the wires are positive 12 V and the third wire is neutral?
RE: 12VDC adapter - archangle - 10-06-2012
(10-06-2012, 12:16 PM)Sleepster Wrote: Has anyone put a voltmeter on it to confirm that two of the wires are positive 12 V and the third wire is neutral?
Do you mean 24V?
RE: 12VDC adapter - Sleepster - 10-06-2012
(10-06-2012, 07:21 PM)archangle Wrote:(10-06-2012, 12:16 PM)Sleepster Wrote: Has anyone put a voltmeter on it to confirm that two of the wires are positive 12 V and the third wire is neutral?Do you mean 24V?
Yes. 24 V.
RE: 12VDC adapter - oldteddybear - 10-06-2012
(10-05-2012, 06:41 PM)Bernie Wrote: I'm aware of the 12V/120V inverter method, but wanted to avoid the extra losses in the conversion process. Actually, the main thing I wanted to know is the actual output voltage under load of the larger ResMed power brick. I guess I'll just have to measure it myself.
Thanks for the reply.
I have one of the 12v S9 power bricks. It comes with an accessory adapter that will allow you to clip onto a car battery. I will look at it to see if there are any extra details on it.