Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 09-06-2015, 15:28   #16
SFH
Registered User
 
SFH's Avatar

Join Date: Jun 2013
Location: Danish
Boat: Jeanneau Yacht 53
Posts: 74
Send a message via Skype™ to SFH
Re: Need 12V stable power supply for WIFI router

Quote:
Originally Posted by senormechanico View Post
I installed a Ubiquity Bulllet and a run of the mill Netgear AP several years ago.
I tossed the ac brick and used the DC output cable to wire it to the boat.
Both of them are on a single breaker/switch directly to the DC buss.
No problem ever.
Dr. Phil

The Ubiquity Bullet POE needs 24V and the router 12V. How did you wire that up?

Steen
__________________

__________________
SFH is offline   Reply With Quote
Old 09-06-2015, 15:36   #17
Registered User

Join Date: Apr 2013
Location: So Cal
Boat: Catalina 30
Posts: 943
Re: Need 12V stable power supply for WIFI router

Quote:
Originally Posted by tpkas View Post
I use an LM317 voltage regulator for many low amperage circuits. I've included a picture of the circuit which is both very simple to build and is very inexpensive. I use this circuit to power a wifi router from my instruments server. It'll accept input voltages between 10v and 36v and output 12v.

Regards,

Brian
Or use a 7812 and save 2 resistors.

Doesn't matter anyway, in all likelihood there's a regulator of some sort from the wall wart socket to the rest of the stuff in the router - it runs at 3.3v or 5v inside. I'd take it apart to look, but that's me.
__________________

__________________
jeepbluetj is offline   Reply With Quote
Old 09-06-2015, 15:37   #18
֍֎֍֎֍֎֍֎֍֎

Cruisers Forum Supporter

Join Date: Apr 2006
Posts: 13,037
Re: Need 12V stable power supply for WIFI router

I'd use a 7812 or 7912 instead of an LM317. There's no need for additional parts, no adjusting, and the chip is significantly cheaper. The regulation is the same for all purposes. Makes for real simple building. Filter capacitors really aren't needed for this type of simple stuff, and the chip should handle the same 1.5A if bought in the right package.
__________________
hellosailor is offline   Reply With Quote
Old 09-06-2015, 15:52   #19
Registered User

Join Date: Mar 2007
Location: On the hook in Florida
Boat: Tayana V42 - Passages
Posts: 504
Re: Need 12V stable power supply for WIFI router

Quote:
Originally Posted by SFH View Post
Dr. Phil

The Ubiquity Bullet POE needs 24V and the router 12V. How did you wire that up?

Steen
My Bullet works fine on 12 volts from the batteries.
__________________
Trying to live on 20th century money in the 21st century.
jcapo is offline   Reply With Quote
Old 09-06-2015, 16:48   #20
Senior Cruiser
 
senormechanico's Avatar

Cruisers Forum Supporter

Join Date: Aug 2003
Boat: Dragonfly 1000 trimaran
Posts: 5,826
Re: Need 12V stable power supply for WIFI router

Quote:
Originally Posted by SFH View Post
Dr. Phil

The Ubiquity Bullet POE needs 24V and the router 12V. How did you wire that up?

Steen
I'm not a doctor, but I went to one once...

The Ubiquity Bullet will work on UP TO 24 volts, but does not NEED 24 volts.
It has an internal power supply that increases current draw as voltage drops.
The actual guts of the transceiver probably see a constant voltage as a result.

Before installing mine on the masthead, I hooked it up to a variable DC supply and a volt meter and ammeter, and sure enough, it draws twice as much current at 12 volts than it does at 24. It's still an insignificant amount either way. At 12 volts, the Bullet and the Netgear router draw about a half amp combined total.
__________________
Memento,homo, quia pulvis es, et in pulverem reverteris.
senormechanico is offline   Reply With Quote
Old 09-06-2015, 18:50   #21
Moderator
 
Paul Elliott's Avatar

Cruisers Forum Supporter

Join Date: Sep 2006
Posts: 3,866
Images: 4
Re: Need 12V stable power supply for WIFI router

Quote:
Originally Posted by jeepbluetj View Post
Or use a 7812 and save 2 resistors.

Doesn't matter anyway, in all likelihood there's a regulator of some sort from the wall wart socket to the rest of the stuff in the router - it runs at 3.3v or 5v inside. I'd take it apart to look, but that's me.
If you want 12V out, you can't use a 317 or 7812-type regulator. These are great linear regulators, but they require that the input voltage be at least 2V greater than the regulated output voltage. If you set one up for 12.0V output and feed it with (say) 13V, the output will be somewhere around 10.8V and will not be regulated. Feed it with 10V and the output will be less than 8V.

You need a switcher, not a linear regulator. For the router you can probably get by with a good direct battery connection, and forget the regulator. The battery gives you a pretty clean voltage, but transient protection is good to have. I would be reluctant to use a bare 15V zener for that though, since the transient current will probably fry the diode. A resistor / inductor / capacitor / zener circuit would be safer.
__________________

__________________
Paul Elliott, S/V VALIS - Pacific Seacraft 44 #16 - Friday Harbor, WA
www.sailvalis.com
Paul Elliott is online now   Reply With Quote
Reply

Tags
route, wifi

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Refrigerator 12v/110v power supply J. Nikitaridis Marine Electronics 12 24-02-2015 11:15
Adding High Power wifi to goFree Router simonpickard Marine Electronics 6 11-05-2014 17:54
12V Charger as Power Supply Hugh Walker Electrical: Batteries, Generators & Solar 10 11-02-2012 06:59
Need WiFi Router, Coax and Antenna David M Marine Electronics 16 31-01-2012 17:52
WiFi Bullet and Linksys Router Config Meck Marine Electronics 1 17-10-2009 09:03



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 18:18.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.