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Post by drew571 on Dec 3, 2017 17:49:08 GMT -6
So I just got my first pedalboard. It has several 1/4" input jacks on the side that are also next to the power feed. The cabling was all done with Mogami. Anytime I connect my guitar to any of these three jacks it introduces some hum into the signal chain. If I simply bypass these jacks and plug directly into my tuner I don't have any hum and it's completely clean. Any idea what could be causing this? Is this normal?
Thanks
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Post by Tbone81 on Dec 3, 2017 17:56:34 GMT -6
Noise radiating from the powersupply maybe? You said it's next to the power right?
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Post by drew571 on Dec 3, 2017 18:27:36 GMT -6
It is! I bypassed the power outlet and just ran the plug directly to my power supply and all is well. What is the best way to fix this? Will heat shrink around the connectors fix it?
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Post by Tbone81 on Dec 3, 2017 18:53:25 GMT -6
It is! I bypassed the power outlet and just ran the plug directly to my power supply and all is well. What is the best way to fix this? Will heat shrink around the connectors fix it? There are people who could answer better than me but basically I think it's just a proximity issue. The two are too close together. Heat shrink won't do anything but you might be able to change the cabling to something with better shielding...not sure. Better yet, is there a way for you to mount that power supply farther away? |
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Post by johneppstein on Dec 3, 2017 22:29:21 GMT -6
It is! I bypassed the power outlet and just ran the plug directly to my power supply and all is well. What is the best way to fix this? Will heat shrink around the connectors fix it? Heat shrink won't help. You do not want power cables running parallel to signal cables in close proximity. separation of at least 6" to 1 ' should be maintained, and when power and audio need to cross they should do so at 90 degrees. This should minimize inductive coupling. |
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Post by Ned Ward on Dec 6, 2017 18:25:22 GMT -6
What power supply are you using? Looks like you have two different ones fed from two IEC outlets? Different power supplies do make a difference. I have the Voodoo Labs Pedal Power 2 on a board in close proximity to all my pedals, and there's no hum using George L's cable for the connections. Having the 3 bare connectors on the back side of the pedalboard is concerning - if it's plugged in and something conductive crosses those connectors... This appears to be a better solution where there's no exposed contacts and you can use any extension cord, not just an IEC cord: pedalboardshop.com/wp-content/uploads/2013/05/4.jpg |
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Post by Ned Ward on Dec 6, 2017 18:29:12 GMT -6
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Post by drew571 on Dec 7, 2017 20:42:23 GMT -6
I put shrink wrap on the contacts to at least make it safer. It didn't fix the hum obviously. I have a Strymon Zuma for power supply. Don't think that is the issue. I'll replace the power input connection if I have to but it might be easier to change the 1/4" inputs because I won't have to drill new holes in the side. Do you think different input jacks would work better?
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Post by Ned Ward on Dec 21, 2017 11:01:43 GMT -6
Troubleshooting -
Try running a known good cable from guitar to first pedal under your pedalboard so that it goes in the same place as your soldered cables.
If there's no hum, then you may need to revisit your soldering.
Process of elimination, but given you have good power supplies and I have pedals right next to my Pedal Power 2 with out issue, I think it may be a solder joint issue or a section of bad cable, but eliminate things to see what's the culprit.
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