Philips DreamStation CPAP Power backup Using Ryobi 40V battery
thingiverse
WARNING: CPAP machines are medical devices. Any modifications can cause life threatening conditions so use this at your own risk. I'm not responsible for any health issues, or damages to your CPAP machine caused by using this design. This is a battery backup for my Philips dreamstation CPAP machine using the Ryobi 40V power tools battery. In addition to the printed parts, you will also need: 1. Two battery contact springs (which you can get from a Ryobi charger) 2. A DPS5005 power supply module 3. A power cable with compatible barrel connector 4. A 20K ohm resistor 5. Binding post, wires, hot glue gun, etc. 6. (optional) A 2A fuse with inline fuse holder To make the CPAP machine recognize the power supply, you need to: 1. adjust the output voltage to 12v 2. pull up the center pin to 12v using a 20K ohm resistor
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