Re: Power supplies in parallel for more current/same voltage?

"Gerard Bok" <bok118@xxxxxxxxx> wrote in message
news:4378e7d7.5796401@xxxxxxxxxxxxxxxxxxxxxx
> On Tue, 15 Nov 2005 07:46:39 +1300, "Ken Taylor"
> <ken123@xxxxxxxxxx> wrote:
>
>>"Gerard Bok" <bok118@xxxxxxxxx> wrote in message
>>news:4378913b.11322538@xxxxxxxxxxxxxxxxxxxxxx
>>> On Sun, 13 Nov 2005 18:27:45 -0800, "Daniel Morrow"
>>> <videoman@xxxxxxxxxxxx> wrote:
>>>
>>>>Hi everyone! I am trying to find a cheap way I can increase the
>>>>current capacity of a power supply by installing fuses to each output
>>>>of multiple universal power supplies, setting each polarity
>>>>correctly, setting each voltage correctly, but in other words combine
>>>>power supplies to get up to 3 amps or more available from the
>>>>parallel power supplies, to drive digital cameras. I have researched
>>>>power supply providers and have found no usable/cheap enough power
>>>>supplies (those dedicated power supplies are very expensive -
>>>
>>> By far the cheapest solution is to buy a single 3 Amp supply.
>>>
>>> Be very VERY carefull: it's not uncommon for 3 Amp supplies to
>>> supply a much higher output voltage than the label says.
>>>
>>> Wich may well result in a 'final flash' from your camera :-)
>
>>What is so unusual about a 3A supply that it's output isn't specified
>>correctly?
>
> Some supplies are stabilized. Some supplies provide the stated
> output voltage (more or less) under the specified load.
> And under no or low load a voltage that is much higher.
> A digital camera connected to a PSU is unlikely to draw 3 Amps
> all the time :-)
>
> Also: some appliances take their input voltage to an internal
> stabilizer. While others just supply it to their chips.
> Without good knowledge of both the PSU and the camera, it is easy
> to blow the camera.
>
> --
> Kind regards,
> Gerard Bok

Um, yeah, well I was kinda assuming that by 3A a supply isn't going to be
unregulated, but it's a fair comment. Pre-morning tea. :-)

Given that the OP is only after about 3A total, a single switch-mode (hence
regulated and stabilized) wall-wart/power-pack is a good option and
certainly better than trying to connect several up in parallel.

Cheers.

Ken


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