gunther
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Post by gunther on Aug 7, 2007 23:40:33 GMT -5
Anyone know how it works and whats so special about the 2, 3, and 4 positions? www.peavey.com/products/browse.cfm/action/detail/item/116158/number/00581620/cat/355/OmniacSeries.cfmBe interesting to have a look inside. And if anyones got a diagram, please fling it my way. I'm keen to try it out on my tele Cheers ;D Edit - Found a thread on the Seymour Duncan Forum: www.seymourduncan.com/forum/showthread.php?t=46917Covers it pretty well. I want to do something similar...but i have a tapped tele bridge pickup. Heres my idea: 1. Neck 2. N + B (JD wiring) 3. N + B Tapped (Parallel) 4. Bridge, Tapped 5. Bridge (full) Anyone wana come up with a diagram??? Cheers Still got some questions about the wiring on the Omniac guitar... * Whats so 'special' about the cap in position 4? * Whats the customized parallel wiring??? If anyone knows, fill us in!!! Thanks
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zamzara
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Post by zamzara on Aug 8, 2007 4:18:50 GMT -5
I'm not sure what 'customized parallel wiring' could mean, one possibility is it's just marketing speak.
I expect the special cap in position 4 engages a different value for the tone cap.
In your list of desired combinations, for position 3 are you looking for N + B (full)?
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gunther
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Post by gunther on Aug 8, 2007 4:46:48 GMT -5
No, i was thinking Neck and Bridge combined in parallel.
Actually i've changed my plan a little!
1. Neck 2. Neck and Bridge combined in series 3. Neck and Bridge (JD wiring) 4. Tapped Bridge 5 Full Bridge
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Post by michaelcbell on Aug 8, 2007 5:58:10 GMT -5
so, clarification for the slow ones in the room... the Bridge is a humbucker and not a dual-tap single coil? What is JD wiring?
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zamzara
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Post by zamzara on Aug 8, 2007 17:11:18 GMT -5
Sorry I meant position 2, not 3 in my question. I wasn't sure what JD wiring meant. I would go with the T-riffic wiring, with a push/pull to tap the bridge pickup.
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gunther
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Post by gunther on Aug 9, 2007 6:47:11 GMT -5
Michael - No, the bridge is a Tapped single coil
The JD wiring Is the neck and bridge in a controlled degree of reverse phase. but i dont know the specifics (help!)
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suicufnoc
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Post by suicufnoc on Aug 9, 2007 8:31:58 GMT -5
Unless its a humbucker, you can't tap it. Tapping a humbucker just means shorting out one of the coils, making it a single coil. If it's already single...
Maybe you mean it's reverse wound?
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Post by ChrisK on Aug 9, 2007 12:23:20 GMT -5
There ARE tapped single coil pickups. In fact, this is the true meaning of tapped, there is a tap or partial winding connection that lets one select a partial number of turns or the full winding.
In most series humbucker configurations one coil is shorted or shunted. One could select either both coils or just one (without shorting) and realize a tapped connection.
This is also called "half-out-of-phase" in that one pickup is in reverse parallel phase with a primary one, but connected to it thru a series network of a cap or a cap and resistor.
This results in a partial cancellation of common frequencies as compared to pickups directly wired in out of phase parallel, and is not nearly as thin sounding.
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Post by michaelcbell on Aug 10, 2007 17:04:03 GMT -5
thanks for the clarification on the JD and the tapping. what you are asking for is pretty simple, except I'm not sure how the half-phased thing would look. ChrisK, any help there? I'll tell you right now that you'll need a superswitch and just a little bit of nuttiness. Once things get cleared up on the half phase issue I'll see what I can do about a diagram.
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Post by JohnH on Aug 10, 2007 17:20:49 GMT -5
The half-phased seems like the most interesting part of this. Im guessing that one coil is OoP, with a cap in series and a resistor in series and/or parallel with the cap. All of that, in parallel with the other coil. As to values - short of actually having the JD diagram - only some listening tests will determine.
John
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Post by ChrisK on Aug 10, 2007 23:46:34 GMT -5
Yeppers! I don't know what this is, but it shows the concepts sans tapping. Note that this uses the regular Fender 5-way lever switch.
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Post by sumgai on Aug 11, 2007 3:10:52 GMT -5
Nope. Here's the dope, straight from Fender: www.fender.com/support/diagrams/pdf_temp1/stratocaster/0101302A/SD0101302APg2.pdfYes, it's a Strat, but Fender's site doesn't show any other S1 equipped guitars as having a capacitor installed. If you blow up the picture in your PDF reader, you can follow all the wires easily. The detail calls out the wire colors nicely, but you still have to blow it up a bit. Or you can save the Visine, and get a more clear picture from my own S1-equipped Strat, which corroborates that there's no phase reversal going on. (Note to JohnH, who picked up on it last time: Yes, I corrected my earlier effort to show the tone controls in the correct position. As per the above referenced document. ) Indeed, it's certainly possible to reverse one of the pickups, but will the resultant sound be desirable? Only a hard-core experimenter will ever find out. ;D Gunther: I personally found this half-assed capacitor phasing thing worthless, tone-wise. But that's just me, YMMV! : HTH sumgai
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Post by ChrisK on Aug 11, 2007 12:03:21 GMT -5
FWIW, Here's the schematic and wiring that I traced from my first Am Dlx S-1 Strat circa Feb 2004.
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Post by sumgai on Aug 12, 2007 21:43:44 GMT -5
Gunther, What Chris and I have shown is not a topic-hijack, we're merely noting the fact that Fender has previously used the capacitor-as-half-phase scheme. I searched Fender's support site, and found no other schematics that use a capacitor for tones beyond those normally found in the quintessential Strat scheme. Where I took exception to Chris (in his response to you, stating that one of the pups is reverse-connected (out-of-phase)) was only in that we know that Fender did not reverse the pickup wiring for the S1 scheme we've shown above. Of course, none of us can speak (yet!) to the J.D. model, that may use a scheme that puts one pickup in reverse to the normal layout. Additionally, the Fender and Peavey models may not be the same thing - one may reverse the pup, while the other doesn't! Only time will tell what the real story is, but for now, suffice it to say, the idea intrigues some folks (my personal preferences notwithstanding). Should you wish to try it for yourself, the actual work wouldn't be that difficult. If your pups are approximately the same impedance as a Strat (<7KΩ for the Neck and Middle/ ~10KΩ for the Bridge), then Fender's 0.003µf should be a good starting point. If you are using much higher output pups, then try a 0.005µf for starters. HTH sumgai
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gunther
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Post by gunther on Aug 12, 2007 21:48:53 GMT -5
Thanks for the info all. I'll try it out one day!
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Post by ChrisK on Aug 14, 2007 17:36:53 GMT -5
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Post by michaelcbell on Aug 15, 2007 7:25:39 GMT -5
nice!
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Post by ChrisK on Aug 15, 2007 11:25:00 GMT -5
Well, don't get tooooooo excited aboot that drawing. I see that the neck hot lead is active/connected in only one switch position.
The 5-way lever switch is less than well defined, so I may be missing something.
I find it extremely odd that the switch terminal positions are mirrored. Physically impossible may be a better description if these are indicative of switching positions. I grudgingly presume that the "0" positions are the switch poles, but who knows.
I am familiar with 5-way lever switches that have the pole terminals at each end (the "5" terminals) and the DiMarzio 5-way lever switch of times past had the poles located at the "4" terminals (referencing this switch pinout), so maybe that's what's going on.
However, both the "4" and "5" cases leave one pole unconnected, but with some of its switch position terminals connected.
I'll have to evaluate this design for three different terminal topologies to be sure. Maybe, if I feel like it.
Does anyone actually know what this switch is?
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Post by michaelcbell on Aug 15, 2007 13:06:12 GMT -5
I definitely didn't get the chance to really go over the diagram. I figured we could figure out the wiring no problem, but I WAS concerned about cap and resistor values... So they're on there, though with all these issues you've found, I don't know if I would trust the values either...more looking at the diagram...and the problems don't stop. If you look at the jack, what I would think was the tip (the upper connection) is connected to both the wiper and the case of the volume pot, while the other half of the jack (I assume the sheild) is connected to the case of the tone pot.
It's pretty, but it really makes no sense.
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Post by sumgai on Aug 15, 2007 14:06:03 GMT -5
The switch in that TDPRI schematic is one ugly sunnuva..... Since this is a pictorial assembly diagram, I'd expect the layout of the wires to be exact, not an approximation. But since the terminals are numbered, I'd also expect them to be correct - isn't that why they are there in the first place? So why does this thing look like an abomination? Without casting aspersions, I have to ask, is this perhaps one of those German MegaSwitch's? I know that they have what I consider to be a "funny" numbering scheme, but I don't know if it matches the one shown here. sumgai
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Post by JohnH on Aug 15, 2007 15:56:38 GMT -5
Its certainly a weird diagram. If one assumes that the position numbers are wrong, so that at least the 1-5 will be in the same order to avoid the switch needing to be built inside out, like a mobius strip or MC Escher drawing, then there is still the fact that the neck only seems to be involved in one position, labelled 4
John
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Post by violoneux69 on Aug 19, 2007 2:24:26 GMT -5
Hi Guys About the switch, if you use the link to the Seymour Duncan forum in the first page of this thread and follow the SD thread to the end, you'll find some answers about the mysterious switch.
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