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Post by cedarchoper58 on Mar 14, 2024 16:43:48 GMT -5
i finnaly solved the noise issue with my True tone one spot power supply. It is really strange and would love if any one could help understand why. Turns out it was not the one spot but a 30' live wire guitar cable from Guitar Center. BUT it was quite with batteries. strait in or with old Boss Wal warts from the 1980's. Why would the cable be quite with every thing except the one spot true tone wall wart power supply
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DrKev
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It's just a guitar, it's not rocket science.
Posts: 418
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Post by DrKev on Mar 15, 2024 2:53:06 GMT -5
Live Wire cables are not special or different to any other cable so there is no reason why. Could the cable be faulty in some way? I've seen cables with a weirdness on the connectors between the tip and the ring (usually a non-infinite resistance or a measuring negative capacitance which, no, I cannot explain), maybe that's what's going on here. If the problem only exists with that cable, there are two options 1) junk the cable and move on with your life, 2) replace the plugs on the end and see if that fixes it. If not, junk it.
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Post by reverendrob on Mar 15, 2024 6:09:33 GMT -5
Live Wire cables are not special or different to any other cable so there is no reason why. Could the cable be faulty in some way? I've seen cables with a weirdness on the connectors between the tip and the ring (usually a non-infinite resistance or a measuring negative capacitance which, no, I cannot explain), maybe that's what's going on here. If the problem only exists with that cable, there are two options 1) junk the cable and move on with your life, 2) replace the plugs on the end and see if that fixes it. If not, junk it. Longer cable run says "more antennae" - with a vintage chain in particular, that's noise central waiting to happen. That and the 30' is a tone-suck to boot! |
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Post by cedarchoper58 on Mar 15, 2024 10:26:45 GMT -5
Live Wire cables are not special or different to any other cable so there is no reason why. Could the cable be faulty in some way? I've seen cables with a weirdness on the connectors between the tip and the ring (usually a non-infinite resistance or a measuring negative capacitance which, no, I cannot explain), maybe that's what's going on here. If the problem only exists with that cable, there are two options 1) junk the cable and move on with your life, 2) replace the plugs on the end and see if that fixes it. If not, junk it. Live wire is lifetime waranty from guitar center. I got another one free and there is no noise. I just wish i knew why it only makes noise with the one spot and not other power sources |
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gbfun
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Post by gbfun on Mar 15, 2024 10:35:48 GMT -5
Don't ask me why but I've experienced buzzing with a particular One Spot but not with batteries or a regulated Boss wallwart in the same circuit too. The only difference I see is that batteries don't produce alternating current and the regulated Boss had a rating of 500ma or less ; the One Spot 1700ma in the older version. As pointed out, longer cables have more resistance and I might add, more chances of damage and manufacturing flaws. Does the One Spot detect this resistance and boost it's power to compensate...thus activating extra flaws in the cable ? After all, the One Spot has over 3x the amp rating of a 500ma Boss because it's designed to run a string of many pedals...not just one pedal like the Boss. My guess is that this extra amp rating might allow the One Spot to ramp up it's output and it's gets detected by the amp and reproduced. Of course this is a little hard to believe as the One Spot is supposed to be putting out a regulated 9.4 volts(I just got one with a device and measured it) of DC CURRENT...not Alternating current...which is the usual cause of most "buzzing". But this amp rating is the only difference I can see. So wtf ? But if you've changed out 100 different cables from 100 different manufacturers and the One Spot still causes buzzing, perhaps one should try another walwart. Trust me when I say this, there are many weird things that can happen with cables and walwarts and pedals and amps. If anyone thinks that this world is totally understandable only needs to ponder the current state of quantum physics and the universe at large. And believe this too. One Spot walwarts are the ONLY walwart that I couldn't use due to buzzing issues...and I've noticed they seem to work in some applications but not in others. I know there are two versions, the old 1700ma and a bigger version. There are fakes to be sure, but the real deals do indeed seem to be regulated, as one would want(9.4v to 9.6v). WHY they buzz sometimes is something I avoid thinking about. But here's another difference I just thought of...my new old One Spot comes with a VERY long cable itself...a very LONG and skinny wire that might not be all that well insulated against interference. If that output wire is damaged or flawed, perhaps it is picking up A/C buzz from another nearby power source ? That long skinny output wire would make a dandy antennae. Stranger things have happened. Example : your story. That's pretty crazy indeed !  |
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pdf64
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Post by pdf64 on Mar 15, 2024 17:22:32 GMT -5
Modern lightweight switched mode power supplies radiate strong electromagnetic fields at their switching frequency, typically in the range 5kHz-50kHz. That can cause various modes of interference into the signal path.
The strength of the radiation can be affected by how heavily the supply is loaded.
It's typical that very light loading causes a bigger interference problem than light loading.
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gbfun
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I eat cookies to provide you with the best possible experience.
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Post by gbfun on Mar 16, 2024 1:45:02 GMT -5
Ah. That would support my initial gut feeling that the 1700ma rating is an issue. I suspect the relatively GIANT amp rating of the 1700ma One Spot is "very lightly loaded" and therefore, would cause noise, so maybe the use of a lower rated wall wart is a possible solution. If I remember correctly, the three pedals he's using amounts to such a low load that even a 300ma wall wart should suffice. If not, a standard Boss 500ma. Pretty easy to test too ! |
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chucksmi
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Formerly Known As: Offshore Angler elsewhere
Age: I saw Jerry Live
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Post by chucksmi on Mar 16, 2024 4:26:55 GMT -5
Sounds like a good choice for a classic Design of Experiments matrix, then some experiments. Science is a wonderful tool.
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pdf64
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Post by pdf64 on Mar 16, 2024 13:39:54 GMT -5
Ah. That would support my initial gut feeling that the 1700ma rating is an issue... If a new instrument cable has fixed things, it may be that the previous (faulty) cable would have picked up noise even if the powee supply was working harder. When I used to use a switched mode power supply, all was fine until the bass player bought a new instrument cable. The old cable was fine, mid range spec / quality but well screened. However, with his new top of the line planet waves cable, he got a buzz when his bass' (precision copy) volume control wasn't on full or zero volume. We tracked it down to my power supply, my thinking was that the unscreened control cavity of his bass must have been picking up noise from it and the input stage of his amp was demodulating it. The higher capacitence of the old cable was probably filtering it out before it got to the amp. With the new cable, at full volume, the pickup capacitance did that job. I changed to a heavy old fashioned power supply and all was fine. |
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gbfun
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I eat cookies to provide you with the best possible experience.
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Post by gbfun on Mar 17, 2024 2:11:54 GMT -5
Geez...weird stuff ! Glad to have this input ! I also had issues with Planet Waves cables(brand new), tried to get new cables from the company using it's "lifetime guarantee" and was told they didn't carry that exact cable anymore and I was out of luck. No refund either. So don't count too much on their "lifetime guarantee" or their quality. I think they are a second rate company that are just repackaging cheap cables and products and marketing themselves as some high quality producer of goods as much as possible, and when the product run is sold out...no more "guarantee". Hmm. Now you got me looking to see if a power supply is switching or not. Good to know ! And I'm pretty sure the One Spots are switching. |
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Post by reverendrob on Mar 17, 2024 5:08:43 GMT -5
Geez...weird stuff ! Glad to have this input ! I also had issues with Planet Waves cables(brand new), tried to get new cables from the company using it's "lifetime guarantee" and was told they didn't carry that exact cable anymore and I was out of luck. No refund either. So don't count too much on their "lifetime guarantee" or their quality. I think they are a second rate company that are just repackaging cheap cables and products and marketing themselves as some high quality producer of goods as much as possible, and when the product run is sold out...no more "guarantee". Hmm. Now you got me looking to see if a power supply is switching or not. Good to know ! And I'm pretty sure the One Spots are switching. Yea, they're a cheapie with a 'guarantee" - which is worth about as much as the...cable itself. Don't get me wrong, I love cheapies - I have a ton of the Monoprice cables that are actually decent... And power supply, well, if there's no noise, don't worry about it. I have close to a hundred effects pedals (and use 20+ at a time with regularity). ONLY ONE is bitchy about power. I ran it on its own power supply for ages but recently got an isolated brick to never deal again and so I had one. |
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Post by markfromhawaii on Mar 20, 2024 11:17:38 GMT -5
Maybe that particular cable has just the right capacitance to cause resonance at the noise frequency. Does the noise go away with different guitars or removing certain pedals from the chain?
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Post by cedarchoper58 on Mar 21, 2024 10:17:26 GMT -5
Maybe that particular cable has just the right capacitance to cause resonance at the noise frequency. Does the noise go away with different guitars or removing certain pedals from the chain? The noise is there with different guitars and amps. Its there with each pedal tested one pedal at a time. its for sure the cable |
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Post by rickyguitar on Apr 6, 2024 17:12:22 GMT -5
Hmm...remember those crappy old coily cords that everybody including Jimi used? No buzz there!
JK.
It was the cord and they replaced it? You are golden.
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