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Old 03-11-2014, 09:44 PM   #1
VeilSide
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power supply question

is it possible to short 2 9v outputs to achieve one 18v output?

lets say each output can provide up to 100mA, if the above assumption is possible, will it make it a 200mA output? or does it depend on the power supply pedal?
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Old 03-12-2014, 09:03 AM   #2
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It depends on what you mean by shorting the thing.

Basically, is that if you connect power supplies in parallel (+ with + and - with -), they'll give you the same voltage and a power up to the sum of the powers of the two supplies, while if you connect the two (first + with second -) you get a voltage equal to the sum of the voltages of the two supplies and a power up to something like the average of the power of the two supplies.

So, you either make the thing work with that explanation or you write how exactly you think of "shorting" the outputs.
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Old 03-13-2014, 02:08 AM   #3
VeilSide
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i was thinking of making a Y looking cable similar to this:


And im sorry, by power supply i meant a power supply pedal, with 9v outputs.

Last edited by VeilSide : 03-13-2014 at 02:09 AM.
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Old 03-13-2014, 02:26 AM   #4
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Hang on. You're what with which to the who now? My brain is imagining shit that it can't deal with.

Two supplies can be run in series if their earths are isolated but you'd want to make sure they were otherwise your just gonna short out one supply to ground, and with a lot of supplies that just means boom.
But that's not what you mean is it? You're thinking of doing a conjuring trick with the dc out on a pedal aren't you?

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Old 03-13-2014, 02:42 AM   #5
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ok ill try to explain a little better lol
lets say this is my pedal power supply



only mine can provide 9v each.

what i need is a 18v output for a mxr 10band eq.

so, if i'll buy / make a cable that plugs in 2 9v outputs in one end, will it be able to power my 18v pedal?
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Old 03-13-2014, 02:49 AM   #6
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You could do it as I said; as long as the earths are isolated from each other - and you wire your Y cable correctly. It has to place the supplies in series, not parallel.
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Old 03-13-2014, 02:57 AM   #7
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Not using the cables you showed.
Adding two 9VDC supplies in series will yield 18vdc.
Why not spend $20 and get one 18VDC supply?

Dunlop Power Supply Model: AD-1815 Output: 18VDC 150mA
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Old 03-13-2014, 09:13 AM   #8
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^ it'd be hella more practical using only one power supply, and if it's insulated you'd keep that benefit.
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Old 03-13-2014, 09:23 AM   #9
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If you have one of those Voodoo labs type supplies, they often come with a cable that allows you to combine two 9v outputs to power 18v pedals.

(My digitech hardwire V10 came with one of those cables and some of the other power supplies I was looking at before I bought it like the T-Rex Fuel tank Jr did too)

Are you thinking of buying a power supply or trying something dodgy with a power supply you already have?

If you're thinking of buying one then the answer is yes if you buy a supply that is designed to do it, if it's the second one then the answer is maybe but do you want to potentially damage equipment if you give it a try?
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Old 03-13-2014, 11:10 AM   #10
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ya its a one i currently have, an Amdek psk 5

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