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JM-1

Joined: 30/09/07
Posts: 607

Current Summation new

#1003003 - 12/08/12 12:12 PM

I wonder - if I were to connect two isolated 9 volt DC sources in parallel, one rated at 250ma and the other at 100ma - would I achieve 9volts at 350ma? Basically I wish to use a current 'doubler' cable on two of the outputs on the Voodoo Labs Pedal Power 2 plus...

Expert opinions most appreciated and gratefully received...

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Folderol

Joined: 15/11/08
Posts: 2553
Loc: Rochester, UK

Re: Current Summation new

[Re: JM-1]
#1003048 - 12/08/12 04:35 PM

If they are simple transformer-rectifier-cap then you'll get away with it, but probably won't get quite as much current as you expect.

If they are regulated supplies of any kind then whichever outputs the (fractionally) greater voltage will try to supply the current. By the time its voltage drops enough for the other one to take up the slack you are almost certainly over-stressing it.

With the cost of small PSUs these days, I really don't see any point in taking the risk.

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It wasn't me!
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Hugh Robjohns
SOS Technical Editor

Joined: 25/07/03
Posts: 18398
Loc: Worcestershire

Re: Current Summation new

[Re: Folderol]
#1003097 - 12/08/12 06:36 PM

+1 wot he said. Why take the risk? Buy a chunkier supply that will do the job properly.

H

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Technical Editor, Sound On Sound

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JM-1

Joined: 30/09/07
Posts: 607

Re: Current Summation [Re: JM-1]
#1003183 - 12/08/12 10:10 PM

Thanks Guys - that's exactly what I'll do...

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