 EE help, Voltage Drop over copper |
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| bd1308 |
 May 2 2005, 10:08 PM
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#1
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Sir Post-a-lot  Group: Members Posts: 8,020 Joined: 24-January 05 From: Louisville,KY Member No.: 3,501  |
okay, i have a question. I'm trying to do Power-Over-Ethernet using the (unused) blue pair of ethernet wires. 5VDC......i run the wire (~70 or so feet) and plug it in, and not enough voltage to boot my wireless router....seems that i need under 1.4VDC....how the hell can i add 5VDC to 1.4VDC. I tried getting one of those adjustable AC adaptors and hooking them in series and parallel... in series neither worked...got like 1VDC, and in parallel, well....i tested it later (after it was working) and found the voltage to be around 14-15VDC.....what the hell?
AC adaptor->modified 10/100->~70 foot run to attic->blue pair seperated from RJ45 Jack->in-to router. |
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| mightyohm |
May 3 2005, 10:12 AM
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#2
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Advanced Member Group: Benefactors Posts: 2,277 Joined: 16-January 03 From: Seattle, WA Member No.: 162 Region Association: Pacific Northwest  |
Well regulated DC will not have a significant effect. AC might cause problems. Some additional filtering across the supply lines at the point where the DC feeds into the CAT5 (a 0.1uF cap in parallel with a 1uF or 10uF) probably wouldn't hurt.
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Posts in this topic
bd1308 EE help May 2 2005, 10:08 PM
914GT First of all, your adapter needs to be able to sup... May 2 2005, 10:19 PM jkeyzer Ohms law will tell you the voltage drop to expect ... May 2 2005, 10:20 PM lapuwali I was just about to type in almost exactly what jk... May 2 2005, 10:30 PM Loser_Cruiser If you truly need a power over CAT 5 cable, it wou... May 2 2005, 10:47 PM bondo What you need is a power supply with remote sensin... May 2 2005, 11:20 PM bd1308 the AC adaptor is OEM.....5VDC....regulator would ... May 2 2005, 11:33 PM bd1308 ethernet does have 2 unused pairs....cool stuff. h... May 2 2005, 11:36 PM bondo May 2 2005, 11:44 PM bd1308 okay....just thought of something....why couldn... May 2 2005, 11:52 PM lapuwali May 3 2005, 09:09 AM jkeyzer Make sure the 9V adapter is capable of supplying t... May 3 2005, 09:19 AM Dr. Roger won't the EMF surrounding these power wires to... May 3 2005, 09:36 AM davep DC can cause problems also if the current draw is ... May 3 2005, 10:21 AM Tom Perso Couldn't you just double up the wires? Ethern... May 3 2005, 10:29 AM bd1308 jkeyzer: AC power wouldnt work...the bleedthrough ... May 3 2005, 10:42 AM bondo ... May 3 2005, 05:26 PM bd1308 yeah...i'm just not so sure about this whole b... May 3 2005, 06:34 PM 914GT Lynksys makes a power over ethernet adapter kit. I... May 3 2005, 07:45 PM
bondo May 3 2005, 07:51 PM |
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