Need cheap supplier of regulated 9vdc Power Supplies

[Pedro Popadopolous]

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

[Bob Eager]

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:

the keyword 'psu'.

[John Rumm]

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

[Pedro Popadopolous]

Thanks guys

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

:-)

[John Rumm]

"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.

[Dave Plowman (News)]

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.

[Harry Bloomfield]

Pedro Popadopolous was thinking very hard :

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.

[Dave Plowman (News)]

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

[Stefek Zaba]

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

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