maxx
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Post by maxx on Oct 6, 2007 4:11:24 GMT -5
The fact that you're using three volumes does complicate things in series. Apparently, all I'm able to do is: make it more complicated! ;D Cheers Maxx
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Post by ChrisK on Oct 6, 2007 12:26:50 GMT -5
Not at all, maxx. If the pickups had no individual volume controls, the switching is easier since only the pickups are switched. In this structure, there is a volume control for each. When a pickup is in a parallel structure, the volume pot wipers can be connected to the switching as in an LP. Or, the "reverse LP" wiring scheme can be used where each pickup goes to the wiper on its volume pot and the hot terminal of each pot can be connected to the switching. The latter method is fairly good for volume attenuation of a pickup when in a series structure since the pot itself shunts or shorts across the respective pickup. What this means for this wiring exercise is that when a pickup/pot is used in parallel, the hot terminal of each pot will be connected to the switching means, and when a pickup/pot is used in series, the wiper/pickup output terminal of each pot will be connected to the switching means (with the hot terminal of each said pot likely not used). This is because when a pickup is in parallel, the attenuation of its signal thru an increase in output impedance (essentially added by the pot as turned down) is ok, but in series we want to reduce the contribution of that pickup while preserving the general low impedance of the signal flow path from the other pickups around the pickup being attenuated. In the "Series_Parallel Blend Pot w/ DPDT switch" module here, I show the general structure that I'm discussing; guitarnuts2.proboards45.com/index.cgi?board=schem&action=display&thread=1145315219Now, I'm using a dual element blend pot, but you can see the idea if each pot is individual.
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maxx
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Post by maxx on Oct 7, 2007 19:37:55 GMT -5
Hi Chris, while I get what you're saying in your post, the schematics on your link don't say much to me, (that's just because, as I said, I'm not able to follow technical drawings) Anyway, if we are goin' to have to use a blend pot (if I understood well), its use, I think, is not goin' to be very comfortable in on stage situations, so I guess we either go back to the 2 volumes-2 tones structure or just forget about series combination(or maybe reduce it, if possible, only to the Middle and Bridge PUs for lead guitar purposes) Cheers Maxx
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Post by ChrisK on Oct 9, 2007 12:45:18 GMT -5
maxx,
I apologize, I wasn't saying that we needed a blend pot. I was just referencing those schematics to show how a pickup could be connected to its volume pot and still be used in both a parallel and series structure. That's all.
In other words, if the pickup signal lead is connected to the pot wiper (the pickup "ground" lead is connected to the pot's "ground" terminal) and the pot's hot terminal is connected to the circuit when in parallel and the pot's wiper/pickup signal lead is connected in series, we can use the same pot easily to function in both series and parallel.
I haven't forgotten about your design. We had a really good weekend as far as sun and great weather (northeast US) and had to get out and enjoy it before the fall/winter arrives.
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maxx
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Post by maxx on Oct 10, 2007 9:21:17 GMT -5
In other words, if the pickup signal lead is connected to the pot wiper (the pickup "ground" lead is connected to the pot's "ground" terminal) and the pot's hot terminal is connected to the circuit when in parallel and the pot's wiper/pickup signal lead is connected in series, we can use the same pot easily to function in both series and parallel. Excellent! No worries, I'm quite busy too and won't have much time anyway in the next couple of days. As for the design, it'd be great if you could work it out, next week. Meanwhile, when I have some time I will attempt to complete it myself with your new indications and see if I can come out with something funny!.... ;D Thanks a lot Maxx
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maxx
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Post by maxx on Oct 15, 2007 16:59:28 GMT -5
Hi Chris, I’ve had some time to do another attempt at drawing the diagram. You’ll probably find it hilarious, but that’s all I could come up with ;D
Following are some notes and questions: Please note that to make it have some sense to me I had to assume that the Push/Pull switch works as an On/On one (to select between Parallel and Series) Actually, I’d appreciate if you could explain how they really work
1)Parallel wiring (Black line + Red for the 2nd lead of the Epi):
a)Signal lead of Bridge and Neck (Gibson) PUs goes: to the pot wiper to the P/P switch to pot output to the 3 way switch. Right?
b)Trying to figure out where to connect the black lead of the Middle (Epi) PU, I assumed it goes to the Pot Ground (that’s from looking at other diagrams). Question: Isn’t this like connecting it to the PU shell (which we don’t want), when the shell goes to ground too? Or is the shell not to be connected to ground?
2)Series wiring (Blue line):
Here I tried to follow your advices, but I’m pretty sure I’ve missed something
a)If, and I mean IF, I got your indications right, the signal lead of the Neck (Gibson) PU goes: from the wiper to the P/P switch to the Wiper of the Bridge(Gibson) PU to the Black lead of the Middle (Epi) PU Plus each Pot’s wiper go to the 3 way switch Right?
To be honest, I couldn’t explain how this would work if asked, I just hope that I made one step closer to understanding ;D
Cheers Maxx
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maxx
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Post by maxx on Oct 18, 2007 18:46:02 GMT -5
Hello... Chris? Are you still with me?
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Post by ChrisK on Oct 18, 2007 19:36:34 GMT -5
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Post by ChrisK on Oct 24, 2007 19:45:46 GMT -5
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