#1
Would there be any difference in hum between the following two options:
1) visual sound onespot with daisy chain (several 9v power supplies in one) connecting several pedals
2) surge protector with several individual 9v power supplies plugged in

To be more technical – I know that the hum/buzz issue with daisy chain results from the pedals sharing a ground. Would that be any different with the surge protector idea? Can’t afford an independent power supply so I’m trying to decide what’s best.
#2
The pedals are essentially going to share a ground anyway, that being the sleeve of the cables you're using to connect them. I would think that multiple supplies would be more noisy, especially if they're cheap, unregulated, and poorly filtered.
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#3
^That.

The One Spot is great though. Depending on what you're running, of course, it shouldn't be too noisy.
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#5
I'd highly recommend getting just one 1spot instead of several individual ones. Yes, it would be a lot noisier. Probably, a little bit more expensive and a lot more difficult to setup, too. Or maybe it depends on what PSA's you're planning to use.

EDIT: I think the only problem with 1spot is that you're limited to 9V ones. PSU's would be the best choice.
Last edited by batiboy06 at Oct 18, 2011,
#6
Quote by deathletter

To be more technical – I know that the hum/buzz issue with daisy chain results from the pedals sharing a ground. Would that be any different with the surge protector idea? Can’t afford an independent power supply so I’m trying to decide what’s best.

No.
A ground loop is when there is more than one ground. You WANT them all to share a common ground.
Noise problems come from ground loops, and unfiltered power.
Im not sure if the 1spot has a filter or not.
The adapter I used didnt have one, and I had a bad hum. I built one and it's dead quiet now.
Last edited by darkwolf291 at Oct 18, 2011,
#7
I have a 1Spot. It's clean - no hum. I think it uses a switching power supply. As others have mentioned, ground loops are fairly common when you start plugging things into different outlets, but they are all interconnected. This causes the ground potential to be different among the different devices and we hear it as hum.
#9
Quote by darkwolf291
No.
A ground loop is when there is more than one ground. You WANT them all to share a common ground.
Noise problems come from ground loops, and unfiltered power.

Whew, only 6 posts into the thread until the truth appears.

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#10
The only real problem you can run into with using one supply (as long as you aren't exceeding total current load) is if you try to run a pedal that has a different internal earth. Most pedals use a negative internal earth but there are some that use a positive earth (the arbiter fuzz face being the most well known one). If you do that you have just connected positive to negative and shorted out the supply.
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#11
I have the One Spot and it's great as mentioned above. No hum or noise and convenient by having no space taken up on my pedalboard
#12
9v batteries will eliminate almost all of your hum.
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#13
Quote by Robbgnarly
9v batteries will eliminate almost all of your hum.

So does an LM317T.
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#14
Quote by Robbgnarly
9v batteries will eliminate almost all of your hum.


Makes your wallet sing far less too.

Another thing to consider is that some pedals don't always agree when running a daisy chain pedal.