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Post by edoetsch on Oct 23, 2018 6:15:21 GMT -7
I have a few positive center pedals like the Fulltone Soul Bender, '69, D*A*M Fuzz Sound
If while messing around i accidentally were to plug in a standard DC converter and remove it quickly, is there significant risk to the circuit?
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Post by headshrinker (Marc) on Oct 23, 2018 7:52:17 GMT -7
From what I have been told, most manufacturers put something in the circuit to keep it from blowing (maybe a diode? don't remember what) if you leave it in only a short time. Long time, it will screw things up. If you did it and it works afterwards, you're good.
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Post by daddyelmis (Greg) on Oct 23, 2018 9:27:47 GMT -7
Generally you’ll fry the diode - if the manufacturer put one in to protect the circuit. Otherwise you fry the ICs on the board. The diode saves the circuit but it then needs to be replaced so you’re still soldering parts to the board.
I should add that I cannot understand why pedal designers don’t use a universal standard polarity (ie, center positive) - just pick one and everybody use it.
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Post by KeithA on Oct 23, 2018 13:14:54 GMT -7
I should add that I cannot understand why pedal designers don’t use a universal standard polarity (ie, center positive) - just pick one and everybody use it. I'm pretty sure the reverse polarity is due to the power requirement for the Ge transistors in the fuzz pedals, IIRC.
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Post by daddyelmis (Greg) on Oct 23, 2018 14:14:05 GMT -7
But couldn’t the design just reverse the polarity internally after the power input so the adapter would be the same for all pedals?
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Post by KeithA on Oct 23, 2018 17:01:04 GMT -7
But couldn’t the design just reverse the polarity internally after the power input so the adapter would be the same for all pedals? You would think, but I'm giving builders like Fulltone the benefit of the doubt here! I agree, that makes perfect sense but there has to be some reason why these companies don't do it...I hope 😊
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Post by LuckyBlackCat on Oct 23, 2018 17:32:13 GMT -7
But couldn’t the design just reverse the polarity internally after the power input so the adapter would be the same for all pedals? I’ve always wondered this too...wouldn’t it just be a wire swap on the jack to change it from center negative to center positive and vice/versa? I feel like if it was that simple we wouldn’t even be talking about it, but I’ve gone over it in my head a bunch and can’t figure out why one couldn’t just swap the wires to change the polarity.
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Post by KeithA on Oct 24, 2018 0:54:26 GMT -7
But couldn’t the design just reverse the polarity internally after the power input so the adapter would be the same for all pedals? I’ve always wondered this too...wouldn’t it just be a wire swap on the jack to change it from center negative to center positive and vice/versa? I feel like if it was that simple we wouldn’t even be talking about it, but I’ve gone over it in my head a bunch and can’t figure out why one couldn’t just swap the wires to change the polarity. I'm pretty sure you are right! Even the 'special' cable that you can buy for the Voodoo power supply simply reverses the two wires.
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Post by daddyelmis (Greg) on Oct 24, 2018 4:32:20 GMT -7
I think the designers’ answers would sound a lot like Nigel’s explanation of his knobs going to 11:
Marty DiBergi: Why don't you just make ten louder and make ten be the top number and make that a little louder?
Nigel Tufnel: [pause] These go to eleven.
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Post by Lefty on Oct 24, 2018 6:53:34 GMT -7
"Authenticity"
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Post by edoetsch on Oct 25, 2018 5:56:35 GMT -7
I have a Power Brick with isolated power but remember when I had the cheaper daisy chain that even with the reverse (red) jack the chain did not power. The issue is the use of NPN vs PNP transistors (I think, I've forgotten my 1992 Electronics Class in the Physics Department) Perhaps they simply cannot exist on the same power circuit.
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Post by edoetsch on Oct 25, 2018 5:57:59 GMT -7
I run everything on batteries except my pedal board which I RARELY alter. In general I am safe by doing this.
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Post by premiumplus (Dave) on Oct 25, 2018 7:01:59 GMT -7
The problem is that if you daisy chain your effects power supply and reverse polarity one of them, it will short the daisy chain out through the ground wire in your interconnect cables. Effects cases are electrically "grounded" and that means that with a standard effect wired with the barrel of the power cable positive, the shield of the guitar and interconnect cables is at +9 volts dc. So when you reverse the electrical "ground" in the pedal it makes the shield of the cables negative, and when you plug the effects together they will short out the power supply through the shield of the cables. You have to use a completely isolated power supply for your reverse polarity effects, then it'll work.
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Post by daddyelmis (Greg) on Oct 25, 2018 10:32:08 GMT -7
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Post by KeithA on Oct 25, 2018 10:55:11 GMT -7
Same question I had as I know I can get a similar cable for my Voodoo power supply to run those type of pedals.
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Post by premiumplus (Dave) on Oct 25, 2018 15:11:51 GMT -7
Does it work when it's connected in a daisy chain to the same One Spot supply, powering one positive ground and the other negative ground, plugged together with cables? If so, I'm wrong and apologize for misleading info. I just don't see how it could work. I think you'd need two power supplies, then it would be okay.
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Post by daddyelmis (Greg) on Oct 25, 2018 21:06:40 GMT -7
Yep, that’s how the One Spot polarity adapter works. You could have 5 pedals, one requiring reverse polarity, and hook all 5 to one daisy chain with the adapter reversing polarity on just the one pedal.
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Post by premiumplus (Dave) on Oct 26, 2018 5:56:28 GMT -7
That'll work great. Totally isolated. The only problem comes with a common ground on the power supply daisy chain.
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Post by Paul (TRANE) on Oct 26, 2018 18:16:22 GMT -7
Analogman reverses the wiring internally for Germanium pedals made currently. He warns you to NOT daisy chain with regular pedals still. However if you are using an isolated power supply like a Voodoo Lab PP2+ then no issues with his current stuff.
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