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PICList Thread
'[EE] Source of (cheap) 24V power supply'
2009\06\04@212326 by Vitaliy

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Requirements:

- 24V output
- As cheap as possible
- 5.5 mm barrel type connector (2.5 mm hole)

We plan to buy them in quantities of 10, but may buy a large quantity if
necessary.

Any suggestions?

2009\06\04@213426 by peter green

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Vitaliy wrote:
> Requirements:
>
> - 24V output
> - As cheap as possible
> - 5.5 mm barrel type connector (2.5 mm hole)
>
> We plan to buy them in quantities of 10, but may buy a large quantity if
> necessary.
>  
How cheap is cheap?
How much current do you require?
What is the input voltage?
Do you care about what regulatory approval markings it has? if so do you
care whether they are fraudulant or not?

2009\06\04@220100 by Vitaliy

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I left out these details on purpose, hoping to get a range of responses. :)

peter green wrote:
> How cheap is cheap?

As cheap as possible. IIRC right now we're paying around $10/ea, but they're
the wrong type (2.1 mm inner diameter) so we have to change the socket on
the device side to use them.


> How much current do you require?

Around 500 mA. A little less is OK, more is OK too.


> What is the input voltage?

110 V, with US style plug. But 110V/220V (automatic switching) would be even
better.


> Do you care about what regulatory approval markings it has? if so do you
> care whether they are fraudulant or not?

This is a good question. If we are bundling the power supplies with our
equipment, and the UL mark turns out to be fraudulent, would we get sued if
the power supply catches on fire, and burns down the building?

Vitaliy

2009\06\04@225735 by Xiaofan Chen

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On Fri, Jun 5, 2009 at 9:58 AM, Vitaliy <spam_OUTspamTakeThisOuTspammaksimov.org> wrote:
>
>> Do you care about what regulatory approval markings it has? if so do you
>> care whether they are fraudulent or not?
>
> This is a good question. If we are bundling the power supplies with our
> equipment, and the UL mark turns out to be fraudulent, would we get sued if
> the power supply catches on fire, and burns down the building?
>

You have a wrong perception here. No matter what you will get sued.
If the UL mark is real, you have better change to win the case or
reduce the damage. If the UL mark is fraudulent and they can
prove that you know that it is fraudulent or you do not do due
intelligence to check that, you are in big trouble.

--
Xiaofan http://mcuee.blogspot.com

2009\06\05@082804 by M.L.

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On Thu, Jun 4, 2009 at 10:57 PM, Xiaofan Chen <.....xiaofancKILLspamspam@spam@gmail.com> wrote:

>
> You have a wrong perception here. No matter what you will get sued.
> If the UL mark is real, you have better change to win the case or
> reduce the damage. If the UL mark is fraudulent and they can
> prove that you know that it is fraudulent or you do not do due
> intelligence to check that, you are in big trouble.
>
> --
> Xiaofan http://mcuee.blogspot.com
> --
>  <http://www.piclist.com>
>



That may be the case, but your odds of getting struck by lightning are
probably higher than having a wall-wart burn down someone's house. Even the
really cheap ones are designed just well enough to not cause a fire. They
might get warm because they left a few laminations off of the transformer,
and they probably smell like that awful oil that parts from China get coated
in, but it's probably not going to burn your house down.

--
Martin K.


'[EE] Source of (cheap) 24V power supply'
2009\08\31@094724 by alan smith
picon face
Try XP power or Sino-America for less expensive supplies

--- On Thu, 6/4/09, Xiaofan Chen <xiaofancspamKILLspamgmail.com> wrote:

{Quote hidden}

> --

2009\08\31@095726 by Marc Nicholas

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You never specified AC or DC output -- if AC, you might want to look
into sprinkler power supplies. Heck, you could even use one and just
rectify the output?

-marc

On Thu, Jun 4, 2009 at 9:22 PM, Vitaliy<@spam@spamKILLspamspammaksimov.org> wrote:
{Quote hidden}

> -


'[EE] Source of (cheap) 24V power supply'
2009\09\02@125134 by PicDude
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You might find something on the surplus market.  Try places like 73.com or
allelectronics.com





Vitaliy-2 wrote:
{Quote hidden}

> --

2009\09\02@130522 by Mark Rages

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On Thu, Jun 4, 2009 at 8:22 PM, Vitaliy<KILLspamspamKILLspamspammaksimov.org> wrote:
> Requirements:
>
> - 24V output
> - As cheap as possible
> - 5.5 mm barrel type connector (2.5 mm hole)
>
> We plan to buy them in quantities of 10, but may buy a large quantity if
> necessary.
>
> Any suggestions?
>

What efficiency level?  Stay legal:
http://www.edn.com/blog/1470000147/post/120020612.html

Regards,
Mark
markrages@gmail
--
Mark Rages, Engineer
Midwest Telecine LLC
RemoveMEmarkragesTakeThisOuTspammidwesttelecine.com

2009\09\02@205456 by M.L.

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On Wed, Sep 2, 2009 at 12:51 PM, PicDude<spamBeGonepicdude2spamBeGonespamavn-tech.com> wrote:
>
> You might find something on the surplus market.  Try places like 73.com or
> allelectronics.com
>

Somebody please convince 73.com that they need to redesign their
website. It's terrible.
-
Martin

2009\09\02@234413 by SM Ling

picon face
There is no Walmart here, I find sometime it is more economical to get power
adapter with extra like toys/charger+batteries (etc) from Carrefour than
getting them separately from catalog mail order or electronic retail front.


> Requirements:
> >
> > - 24V output
> > - As cheap as possible
> > - 5.5 mm barrel type connector (2.5 mm hole)
> >
> > We plan to buy them in quantities of 10, but may buy a large quantity if
> > necessary
>

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