Any help greatly appreciated. 500mA needed

I want to run Camera's off these. Even better would be a single PSU that
could run upto 4 cameras @ 500mA each

Thanks in advance

On Sat, 23 Apr 2005 22:36:00 UTC, "Pedro Popadopolous"
wrote:

Any help greatly appreciated. 500mA needed

I want to run Camera's off these. Even better would be a single PSU that
could run upto 4 cameras @ 500mA each

Most of these things seem to be limited to 15W, but you could get a
couple of 1A ones, or four 500mA ones (this may be easier as otherwise
you'd need to split outputs). Have a look at:

http://www.cpc.co.uk

Use the keyword 'psu'.


--
Bob Eager
begin a new life...dump Windows!

Bob Eager wrote:

Most of these things seem to be limited to 15W, but you could get a
couple of 1A ones, or four 500mA ones (this may be easier as otherwise
you'd need to split outputs). Have a look at:

http://www.cpc.co.uk

Use the keyword 'psu'.

Use the key word "switching" - you will get a range including this 6.5A one:


http://cpc.farnell.com/jsp/endecaSea...=PW00757&N=411



--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/

"John Rumm" wrote in message
...
Bob Eager wrote:

Most of these things seem to be limited to 15W, but you could get a
couple of 1A ones, or four 500mA ones (this may be easier as otherwise
you'd need to split outputs). Have a look at:

http://www.cpc.co.uk

Use the keyword 'psu'.

Use the key word "switching" - you will get a range including this 6.5A
one:


Thanks guys

Does the fact its a 'switching' psu mean it will be regulated?

:-)

In message , Bob Eager
writes
On Sat, 23 Apr 2005 22:36:00 UTC, "Pedro Popadopolous"
wrote:

Any help greatly appreciated. 500mA needed

I want to run Camera's off these. Even better would be a single PSU that
could run upto 4 cameras @ 500mA each

Most of these things seem to be limited to 15W, but you could get a
couple of 1A ones, or four 500mA ones (this may be easier as otherwise
you'd need to split outputs). Have a look at:

http://www.cpc.co.uk

Use the keyword 'psu'.

If they're the cameras I'm thinking of, then cameras might also bring up
a hit.

--
geoff

Pedro Popadopolous wrote:

Does the fact its a 'switching' psu mean it will be regulated?

"switching" means it uses a technology called "switched mode" -
basically a way of extracting high current outputs from much smaller and
lighter transformers than you would otherwise expect.

As far as I am aware all switching supplies have regulated outputs. The
CPC part number PW00757 I linked to above achieves a regulation accuracy
of 1% according to its spec.

--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/

In article ,
Pedro Popadopolous wrote:
Any help greatly appreciated. 500mA needed

I want to run Camera's off these. Even better would be a single PSU that
could run upto 4 cameras @ 500mA each

A 2 amp PSU would be too big for a wall wart, so would be free standing.

This one looks good value at about 20 quid.

http://www.rapidelectronics.co.uk/rkmain.asp?PAGEID=80010&CTL_CAT_CODE=30354&STK_PRO D_CODE=M60091&XPAGENO=1

--
*I get enough exercise just pushing my luck.

Dave Plowman London SW
To e-mail, change noise into sound.

Pedro Popadopolous was thinking very hard :
Any help greatly appreciated. 500mA needed

I want to run Camera's off these. Even better would be a single PSU that
could run upto 4 cameras @ 500mA each

Thanks in advance

As other have suggested, except....

A switch mode PSU will be tightly regulated, but might generate a small
amount of electrical noise (interference), especially if the supply
cables are run some distance to the cameras. You should also be aware
that if you are running the cameras all from one supply, that voltage
drop along the cable might be a problem.

--

Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.org

In article ,
Harry Bloomfield wrote:
A switch mode PSU will be tightly regulated, but might generate a small
amount of electrical noise (interference), especially if the supply
cables are run some distance to the cameras. You should also be aware
that if you are running the cameras all from one supply, that voltage
drop along the cable might be a problem.

Might be worth providing separate smoothing/decoupling for each one anyway.

--
*Did you ever notice when you blow in a dog's face he gets mad at you? *

Dave Plowman London SW
To e-mail, change noise into sound.

Dave Plowman (News) wrote:


Might be worth providing separate smoothing/decoupling for each one anyway.

Abso-piggin-lutely, if availability matters to any significant degree.
One supply teed out to all 6? cameras means a fault in any one camera
which causes the power to shut down (in a controlled or uncontrolled
way!) makes all the cameras go dark.

Economics of mass manufacture mean the cheapest way is to buy separate
wall warts and plug them into a single 4-way, 6-way, or whatever mains
block. Any fancier approach, with a central transformer and multiple
downstream regulators, will be either a custom build (easy for an
electronics trade course student to design and knock up) or made for a
'specialist' application - e.g. on-stage gigging. So, over at
www.studiospares.co.uk, under product num 440-950, you'll find a box
with 8 separate 9V outputs, regulated (not *entirely* clear if each
one's 'independently' regulated, but at least each one seems to have
individual short-circuit protection), complete with 8 3-metre leads.
Designed specifically 'for those who despair at the unreliability of
plug top power supplies'. Internal jumpers adjust output polarity.

Oh, the cost? Not stupid, but not trivial: about 70 notes.

HTH - Stefek