monkeyboy
11-16-2004, 01:41 PM
I was trying to figure out a way to provide some DC voltage for an enclosure fan for a WRAP board running on PoE. I checked all the pins on the WRAP board and the most I could come up with was about 3.2 vDC. I figured that would not be enough to run most fans.....so a tinkering I went.
I finally came up with a short piece of CATv cable that is terminated with an RJ45 connection on one end and terminated with a female AMP RJ45 wall jack insert on the other. I cut the ethernet pairs when I punched them to the connector, but I left the brown and blue pairs long, and punched them into the connector.
here are the pics:
http://www.eoni.com/~mike/wireless/wrappics/
I then connected the brown and blue pairs to a 12vDC 80mm fan that pulls .15A. I measured the voltage on the pairs before and after plugging everything in. The lowest voltage I reached after putting in two CM9 cards and running the fan was 16.8 vDC.
It seems like this would work great for pulling air through a box without having a direct AC or DC source. I wanted to ask all of you if you see any major faults that are not immediately apparent from first glance.
We are having a custom box fabricated that this would go in. Aluminum, with a vent chase that runs down the side from top to bottom. Has anyone had something like this made before? Seems like they are a pretty good price @ $150.00
Thanks!
Mike
I finally came up with a short piece of CATv cable that is terminated with an RJ45 connection on one end and terminated with a female AMP RJ45 wall jack insert on the other. I cut the ethernet pairs when I punched them to the connector, but I left the brown and blue pairs long, and punched them into the connector.
here are the pics:
http://www.eoni.com/~mike/wireless/wrappics/
I then connected the brown and blue pairs to a 12vDC 80mm fan that pulls .15A. I measured the voltage on the pairs before and after plugging everything in. The lowest voltage I reached after putting in two CM9 cards and running the fan was 16.8 vDC.
It seems like this would work great for pulling air through a box without having a direct AC or DC source. I wanted to ask all of you if you see any major faults that are not immediately apparent from first glance.
We are having a custom box fabricated that this would go in. Aluminum, with a vent chase that runs down the side from top to bottom. Has anyone had something like this made before? Seems like they are a pretty good price @ $150.00
Thanks!
Mike