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Post by jkemmery on Sept 21, 2007 13:14:37 GMT -5
Does anyone know of a DPDT wiring scheme to switch a humbucker between Single Coil(North)/Humbucker/Single Coil(South)? I have seen this one from GuitarElectronics ...  It looks like it would be fine in the North mode, but in the South mode, North is hanging from hot. I was wondering if someone knew of a better way. |
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Post by JohnH on Sept 21, 2007 16:11:56 GMT -5
jk - I know what you mean, in that although bypassed, the north coil is still hanging from its wires to the hot connection. It may not make very much difference, particularly with a covered pup, but nicer to avoid. One system I like however, is on Jimmy page mods, where there is a phase switch before the coil cut. In coil cut mode, the phase switch then has the result of changing the coil which is selected.
John
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Post by ChrisK on Sept 21, 2007 18:23:00 GMT -5
As John said, although bypassed, it's still hanging.
Since the coil is hard bypassed as in shorted, any inductively sensed noise will not be an issue. The net effect may well be that of the wire leads themselves over a fairly short distance. If these are shielded, best is.
This should be a very minimal noise contributor.
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Post by sumgai on Sept 22, 2007 5:22:41 GMT -5
'Sfunny, I'm seeing a perfectly good diagram that will do what Jake wants, with no hanging hot isses from either coil. Although I am seeing a single pole switch, and not the DPDT called for in the first post. I suspect that one or more of you are looking at both of the North coil's leads being tied to the Hot, and forgetting for a moment that electricity always takes the path of least resistance. This is not an antenna of any sort, mainly because a shorted coil will induce no current whatsoever, regardless of how strong a string's vibrations might excite it. (OK, a minute eddy current might be detectable, on a very sensitive meter.) Effectively, there are two loops, the coil itself, and the loop of the short across the coil's leads. The magnet will be working into both loops at the same time, only the "outer" loop will have just one turn, which will yield mighty small results, you betcha. Remember what we said about inductances increasing in series, and decreasing in parallel? Well, get out your slide rules, boys and girls, and tell me just how much inductance we can expect to see when we look at a coil of 2 Henries in parallel with 0.00000000001 Henry.................. I fail to see how the North coil is dangling off the Hot lead.............  sumgai |
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Post by ChrisK on Sept 22, 2007 9:09:33 GMT -5
My point was that the coil was shorted and not a contributor.
The only possible contributor would be the wire leads themselves, and to little effect, especially if shielded.
Now, as to the sutain decay....
....most won't notice.
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Post by firebottles on Sept 23, 2007 9:27:15 GMT -5
lidbjork.homelinux.org/72cc/mods.htmlfollow this link to a great description/(instructions with photos) of a coil split mod. I did it to my tele and added a toggle switch to select. It works great.
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Post by gfxbss on Sept 23, 2007 10:10:53 GMT -5
jk, i have those coil taps in my LP special. you can check the diagram here.i had never noticed any noise coming from it.... everything sounded great.... Tyler |
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Post by sumgai on Sept 23, 2007 12:56:55 GMT -5
Chris, Understood........ and I wasn't pointing at you as one of the "...... one or more of you......" folks. ;D Sustain decay should be a function of signal strength. It'd be interesting if someone with a shoebox full of various pickups were to run some JohnH-approved experiments.......  sumgai |
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Post by ChrisK on Sept 23, 2007 22:50:13 GMT -5
Wait a minute, it's his experiments that I don't fully approve of (oops, did I say what I'm thinking out loud again?).  |
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Post by sumgai on Sept 24, 2007 0:55:01 GMT -5
Chris,
Wait a minute, it's his experiments that I don't fully approve of (oops, did I say what I'm thinking out loud again?).
Well, I can't say I'm enamored of his test procedure either, it doesn't reflect the real world as a guitar player stands in front of a crowd. But so far, John is the only one I've heard of to actually try something, no matter how I might feel about it.  Got to give him credit for that, eh? sumgai |
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Post by JohnH on Sept 24, 2007 7:14:35 GMT -5
Chris,
Wait a minute, it's his experiments that I don't fully approve of (oops, did I say what I'm thinking out loud again?).
Well, I can't say I'm enamored of his test procedure either, it doesn't reflect the real world as a guitar player stands in front of a crowd. But so far, John is the only one I've heard of to actually try something, no matter how I might feel about it. Got to give him credit for that, eh? sumgai Yup, give me credits, and send me experiments for approval! What are we talking about? - oh yes, noise and hanging coils. My little tests help me understand things, short of having a lab full of test gear, and without trying to calibrate a bunch of guitarists standing in front of their amps. If Im testing an effect where the significance is moot, then what I try to do is make a scenario that creates an extreme version of that effect, and listen to find out if there is something that I can detect. eg - to test shunted coils, I tested with not just one but with four of them. Ground loops - created a massive one to see if it had an effect. Ground loops in a guitarand shunted coils are not a real problem so far as I can tell. If anyone wishes to claim differently, they are invited to submit mp3 files for comparison Heres what I found with hanging coils: Attach a loose pickup with one end connected to the tip of a guitar cord to a high gain amp. Theres a bit of hum created, enough to know theres a real effect, although less than for a normally wired single coil pup. Now short out the leads of that hanging coil to each other, still leaving it connected to hot. Theres no significant change in hum. So Im suggesting that wether a coil is shorted or not does not affect the issues of it hanging. However, I think inside a shielded guitar, one can get away with it if necessary, but better to avoid it. John |
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Post by jkemmery on Sept 24, 2007 10:26:09 GMT -5
Sumgai: I was thinking that it would take a DPDT to not leave the hanging coil ... if indeed it is ... Everyone: Thanks for the input, I'll just use this wiring and not worry about the noise issue. BTW, I've prototyped a wiring scheme for an HSS (SSH?) guitar based around JohnH's ToneMonster2 wiring. There are 3 DPDT on/off switches for the pups, the humbucker gets a DPDT on/on/on that switches it between internal series/north coil/internal parallel, each single coil has a separate phase switch then of course the 4PDT that switches the pups external series and parallel. I did away with the blender and went with a master tone that is a push/pull to switch between .15 and .47 tone caps and added a master midrange scoop from Stan Hinesly from www.Has-Sound.com. The guitar in process is a rear route alder strat style that I have done a red/black burst on with an ebony fingerboard neck from AllParts. It will have Dimarzio pups, Norton bridge, Blue Velvet mid and Red Velvet neck. I'll post pics when it's completed and if anyone wants a wiring diagram. So thanks esecially to JohnH and the ToneMonster2 wiring. |
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Got to give him credit for that, eh?