Re: 12 volt power source?

Ray Haddad wrote:

On Sun, 23 Dec 2007 00:06:37 -0800, I said, "Pick a card, any card"
and David Nebenzahl <nobody@xxxxxxxxxxxxxxx> instead replied:

On 12/22/2007 11:18 PM Ray Haddad spake thus:

On Sun, 23 Dec 2007 08:01:53 +0100, I said, "Pick a card, any card"
and "Klaus D. Mikkelsen" <er.du.saa.klog@xxxxxxxxxxxxxxxx> instead
replied:

Ray Haddad skriver:

By definition, those are parts of a regulator

No, that's what is called an unregulated power supply.

A regulated power supply contains an active omponen thet regulates the
output voltage and/or current.

http://my.integritynet.com.au/purdic/power1.html
http://www.allaboutcircuits.com/vol_3/chpt_9/1.html

They're all part, Klaus. Try building a regulated power supply
without those. The wall cube forms the first part or a chain.

What a lame-ass answer.

But I see what you've been doing: playing with semantics, all to avoid
owning up to your being totally wrong in your arguments so far.

Actually, I never, ever stated that ALL wall warts contained
regulated power supplies. That was down to you and Greg. You claimed
you opened billions of them and never found even one. Ok. Not
billions but you see what you did, right? You moved my statement
over to where YOU could win. Instead of sticking to the original
comments I made, you moved it over and made a big stink over it.

In fact, I never stated that ALL wall warts contained regulated
power supplies only that they made up a composite power supply with
their load. Go back and see. Loading is necessary to get them to be
at the proper voltage according to what is printed on them. For you
to make such a stink over your own misleading comments is very bad
form, David. Very bad.

Yes, a wall wart can form PART of a REGULATED power supply, IF the
regulating part of the circuit is inside the thing being powered. But BY
ITSELF, the wall wart is (always, in my experience), UNREGULATED. To put
it more precisely, any power supply that only contains a transformer,
rectifier and filter is UNREGULATED by itself. Anyone reading my many
previous posts (except, apparently, you) would have gotten that by now.

David, I spent over 40 years in electronics. Don't pretend to tell
me what a regulated power supply consists of.

And yes, we know (or at least I do) that zener diodes are used as
voltage regulators. But as I said, I've never even seen a zener in the
many wall warts I've dismantled, meaning that they're totally unregulated.

Thank you. I have seen them there. You can't have opened every wall
wart in existence. However, let me point out that you probably
opened those you believed weren't working properly. That leads me to
believe you opened them because the voltage was incorrect. That also
leads me to suspect that because of your mistaken beliefs, they
weren't really bad at all just unregulated.

I had a friend who put a 7805 circuit on a 12 volt wall wart. It
promptly caught fire. Both the circuit he built and the wall wart.
The reason? There was a 7512 in the wall wart. Disaster.

This entire subject has been hijacked by you and Greg. All I stated
was that there were no 13.8 volt batteries out there and that the
wall cubes that put out that voltage were chargers, not power
supplies. Now, kindly knock it off and stick to what you know.
--
Ray


Here's a laboratory power supply from Jaycar Electronics:
<http://www1.jaycar.com.au/productView.asp?ID=MP3078&CATID=&keywords=Bench+power+supply&SPECIAL=&form=KEYWORD&ProdCodeOnly=&Keyword1=&Keyword2=&pageNumber=&priceMin=&priceMax=&SUBCATID=>


Here's a laboratory power supply from *** Smith Electronics:
<http://dseau.resultspage.com/search.php?sessionid=476eb5e50123fe3a273fc0a87f9c0718&w=Power+supply+13.8&site=&submit.x=11&submit.y=8>

Sorry the links are so long but that takes you to the specific product.

I've been involved with fitting ship, boat and truck radio/depth finding
etc gear (AWA NZ, a division of RCA USA) All our gear was rated at 13.8
volts because that's the operating voltage found on batteries in circuit
in those situations.
.