12v voltage regulator - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance > Electronics
 Not a Member? 
  #1  
Old 07-07-2014
Senior Member
 
Join Date: Feb 2010
Location: Narragansett Bay
Posts: 8,988
Thanks: 10
Thanked 138 Times in 124 Posts
Rep Power: 6
Minnewaska will become famous soon enough Minnewaska will become famous soon enough
12v voltage regulator

I'm giving yet another 12v TV a try. A Jensen. We'll see. I've returned other attempts.

I was thinking of hard wiring a voltage regulator into the line, so it always received 12v and not the higher voltages that actually come from the house bank.

Any recommendations on which?
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Jeanneau 54DS

In the harsh marine environment, something is always in need of repair. Margaritas fix everything.
Reply With Quote Share with Facebook
  #2  
Old 07-07-2014
Zanshin's Avatar
Senior Member
 
Join Date: Aug 2006
Location: Germany
Posts: 2,165
Thanks: 0
Thanked 14 Times in 14 Posts
Rep Power: 9
Zanshin is on a distinguished road
Re: 12v voltage regulator

It depends upon the current draw, I have a massive (and expensive) 24VDC-12VDC regulator for my SSB, but that's because of the large amperages involved. A simple regulator that brings current down from up to 36VDC to a regulated 12VDC such as the 3Amp Tracopower TSR 3-24150 costs only $30 at farnell.com. The price is high because it is energy efficient, you can get a linear regulator such as the 511-L7812CV for about $0.70, but it would need a heat sink and use more power, especially in standby-mode. The input voltage must be at least 0.5V higher than the output voltage. If you need 12VDC output when the battery is less than 12.5V then a different device is needed, which adds to the cost.
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #3  
Old 07-07-2014
Senior Member
 
Join Date: Feb 2010
Location: Narragansett Bay
Posts: 8,988
Thanks: 10
Thanked 138 Times in 124 Posts
Rep Power: 6
Minnewaska will become famous soon enough Minnewaska will become famous soon enough
Re: 12v voltage regulator

Requiring 12.5v sort of defeats the purpose, but would theoretically work the majority of the time.

I would like to think the Jensen 12v TVs, which are sold specifically for boats and RVs, are capable of taking a variety of input voltages. I just can't find a spec that confirms it. They are all written as "12v", which we all know is almost never actually the case in either a boat or RV.
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Jeanneau 54DS

In the harsh marine environment, something is always in need of repair. Margaritas fix everything.
Reply With Quote Share with Facebook
  #4  
Old 07-19-2014
Senior Member
 
Join Date: Feb 2010
Posts: 174
Thanks: 1
Thanked 7 Times in 7 Posts
Rep Power: 5
redline is on a distinguished road
Re: 12v voltage regulator

I bought a Carnetix DC-DC converter meant for car computers; gives a nice 12v (and 5v) well regulated. Not using it just now; my hair TV seems happy on ship's "12v".


Sent from my iPad using Tapatalk
__________________
Norman
s/y "Redline"
1998 Jeanneau SO45.2
Reply With Quote Share with Facebook
  #5  
Old 07-20-2014
newhaul's Avatar
islander bahama 24
 
Join Date: Feb 2010
Location: bremerton wa
Posts: 996
Thanks: 6
Thanked 30 Times in 30 Posts
Rep Power: 5
newhaul is on a distinguished road
Re: 12v voltage regulator

Specs are 12 v nom with a 3.3 amp/ 25 watt draw on the 19 inch LCD unit model jen1912lcd
__________________
Illegitimus Non Tatum Carborundum.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #6  
Old 07-20-2014
mitiempo's Avatar
Senior Member
 
Join Date: Sep 2008
Location: Victoria B.C. Canada
Posts: 7,121
Thanks: 0
Thanked 71 Times in 62 Posts
Rep Power: 8
mitiempo will become famous soon enough mitiempo will become famous soon enough
Re: 12v voltage regulator

Quote:
Originally Posted by newhaul View Post
Specs are 12 v nom with a 3.3 amp/ 25 watt draw on the 19 inch LCD unit model jen1912lcd
25 watts is basically 2 amps, not 3.3
__________________
Brian
Living aboard in Victoria Harbour
Reply With Quote Share with Facebook
  #7  
Old 08-09-2014
Junior Member
 
Join Date: Oct 2012
Posts: 15
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 0
svinshallah is on a distinguished road
Re: 12v voltage regulator

If you are slightly handy assembling electronics, you can by a Micrel 28000(many different versions with slightly different numbers) low-dropout regulator for 12 volts output. It requires only a couple of capacitors and a modest heatsink. It will regulate down to an input voltage of about 12.1 volts, at which point it will lose regulation and follow the voltage down. But at that point you shouldn't be watching TV anyway. I used these on a 19" TV and a 14" monitor for years. Last ones I bought cost a little over $3 at DigiKey
Reply With Quote Share with Facebook
  #8  
Old 08-09-2014
newhaul's Avatar
islander bahama 24
 
Join Date: Feb 2010
Location: bremerton wa
Posts: 996
Thanks: 6
Thanked 30 Times in 30 Posts
Rep Power: 5
newhaul is on a distinguished road
Re: 12v voltage regulator

Quote:
Originally Posted by mitiempo View Post
25 watts is basically 2 amps, not 3.3
Those numbers were out of the tech manual for that unit JENSEN 19" 12 Volt LED LCD TV. the manual lists it at 28 watts and 3.3 amp max draw my bad
__________________
Illegitimus Non Tatum Carborundum.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #9  
Old 08-10-2014
Senior Member
 
Join Date: Feb 2010
Location: Narragansett Bay
Posts: 8,988
Thanks: 10
Thanked 138 Times in 124 Posts
Rep Power: 6
Minnewaska will become famous soon enough Minnewaska will become famous soon enough
Re: 12v voltage regulator

I ended up installing a 24" Jensen, direct wired (via breaker) to the house 12v power. No invertor needed now, but still wonder if the Jensen has a regulator built in for the naturally varying house bank voltages. The unit is delivered with stripped leads to connect into 12v and is sold for RVs and Boats. One would think they might have thought of regulation. Anyone know? I see nothing in the manual.
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Jeanneau 54DS

In the harsh marine environment, something is always in need of repair. Margaritas fix everything.
Reply With Quote Share with Facebook
  #10  
Old 08-11-2014
Senior Member
 
Join Date: Oct 2009
Location: Cape Cod
Posts: 585
Thanks: 5
Thanked 18 Times in 18 Posts
Rep Power: 5
capecodda is on a distinguished road
Re: 12v voltage regulator

Uniformed opinion from an EE without any data is that if the manufacturer designed the thing for RV's and boats, they know that the input voltage varies during charging and discharge. I hope they aren't dumb enough to think otherwise. I have no spec, but if they didn't do this they are getting a pile of returns from people who aren't smart enough to ask the question you did....so my "guess" is that you are right, no regulator required.
Reply With Quote Share with Facebook
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Old voltage regulator with an AGM battery mondofromredondo Gear & Maintenance 7 07-22-2013 02:49 PM
Voltage regulator questions - buy it or build it? sfchallenger Electrical Systems 3 09-26-2011 12:50 PM
External Voltage Regulator billyruffn Gear & Maintenance 7 06-16-2009 09:05 PM
Looking for a 12V DC under voltage relay stuartbell Gear & Maintenance 6 06-25-2008 01:45 PM
Fried out Voltage Regulator scurvy Gear & Maintenance 28 09-23-2007 07:53 PM


All times are GMT -4. The time now is 05:30 PM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.