Schematic needed For PSU 13.8V @ 5A Regulated

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Pyro_Dan_Downunder

Guest
Hello All,

I was wondering if anyone knew of somewhere or could draw up a
schematic for a 13.8V 5A Regulated Power Supply? Any help would be
greatly appreciated.
Cheers.

Downunder Dan

It was through his shocking misfortune he found a weak spot in the
wall....
 
Pyro_Dan_Downunder wrote:
Hello All,

I was wondering if anyone knew of somewhere or could draw up a
schematic for a 13.8V 5A Regulated Power Supply? Any help would be
greatly appreciated.
Cheers.

Downunder Dan

It was through his shocking misfortune he found a weak spot in the
wall....
Click to expand...
This is a catch-22.
If you need to ask this question, you probably don't want to start with
a switcher.

For a linear supply, your biggest problem is gonna be acquiring the
transformer. If you have to buy it new, you'd be much better off buying
a whole used power supply.
Your only economic choice is to obtain a surplus transformer and design
around it.

The cheapest/most available transformers come from 12V battery chargers.
But they don't put out quite enough volts for a simple design at 13.8V
....unless
there's enough space to add a few turns. And they sometimes have rather
high output impedance optimized for charging batteries.

While you can easily draw a schematic, the devil is in the details.
You need something that won't quit when the line voltage droops, or melt
when it peaks. Current limits? Overvoltage protection? Input spike
protection.

This question comes up a lot in the ham radio newsgroups. People spend
weeks building a supply that saved them 10 bucks then hook it up
to a $1000 radio. If the supply shorts, poof goes the radio. Or if you
get really lucky, burns down your house. False economy.

If you decide to do this and you are gonna power something you value,
make sure you evaluate the hell out of your design. You're gonna need
a wideband oscilloscope and a means to apply transient loads at a rate
sufficient to view on your scope.

Anybody who tells you power supply design is easy has never tested one
thoroughly.
mike





--
Return address is VALID.
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FS 500MHz Tek DSOscilloscope TDS540 Make Offer
http://nm7u.tripod.com/homepage/te.html
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Bunch of stuff For Sale and Wanted at the link below.
http://www.geocities.com/SiliconValley/Monitor/4710/
 
On 15 Jan 2005 02:36:57 -0800, je_turner@optusnet.com.au
(Pyro_Dan_Downunder) wrote:

Hello All,

I was wondering if anyone knew of somewhere or could draw up a
schematic for a 13.8V 5A Regulated Power Supply? Any help would be
greatly appreciated.
Cheers.
Click to expand...
Computronics (Perth) have a meanwell S-60-12 which you can adjust up
to 13.2V, for 32.50AUD... if that voltage is good enough the price
makes a mockery of the cost of building one yourself.
 
Jeff wrote:
On 15 Jan 2005 02:36:57 -0800, je_turner@optusnet.com.au
(Pyro_Dan_Downunder) wrote:


Hello All,

I was wondering if anyone knew of somewhere or could draw up a
schematic for a 13.8V 5A Regulated Power Supply? Any help would be
greatly appreciated.
Cheers.



Computronics (Perth) have a meanwell S-60-12 which you can adjust up
to 13.2V, for 32.50AUD... if that voltage is good enough the price
makes a mockery of the cost of building one yourself.
Click to expand...

Maybe:
http://www.allelectronics.com/cgi-bin/category.cgi?&item=PS-125

or, for a really nice benchtop PS:
http://www.allelectronics.com/cgi-bin/category.cgi?&item=PS-2512



-- "Don't let life get in the way of your potential." MCJ 200311
 
I read in sci.electronics.design that Mark Jones <abuse@127.0.0.1> wrote
(in <WIWdnbYr_5X5o3TcRVn-ug@buckeye-express.com>) about 'Schematic
needed For PSU 13.8V @ 5A Regulated', on Sat, 15 Jan 2005:

-- "Don't let life get in the way of your potential." MCJ 200311
Click to expand...
Don't let potential get in the way of your life!
--
Regards, John Woodgate, OOO - Own Opinions Only.
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk
 
On Sat, 15 Jan 2005 17:29:30 +0000, John Woodgate wrote:

I read in sci.electronics.design that Mark Jones <abuse@127.0.0.1> wrote
(in <WIWdnbYr_5X5o3TcRVn-ug@buckeye-express.com>) about 'Schematic
needed For PSU 13.8V @ 5A Regulated', on Sat, 15 Jan 2005:

-- "Don't let life get in the way of your potential." MCJ 200311

Don't let potential get in the way of your life!
Click to expand...
Don't tell your kids they have "great potential" unless you want them to
turn out like me.

"Oh, you have so much potential! (why are you such a disappointment?)"

Good Luck!
Rich
 
"Pyro_Dan_Downunder" <je_turner@optusnet.com.au> wrote in message
news:c5229db1.0501150236.35b93c73@posting.google.com...
Hello All,

I was wondering if anyone knew of somewhere or could draw up a
schematic for a 13.8V 5A Regulated Power Supply? Any help would be
greatly appreciated.
Cheers.

Downunder Dan
Click to expand...
If you really want to make your own power supply, take a look at
http://www.fncwired.com/13_8VoltExample/ , drawn up for you.
Brian
 
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