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Post by strangebone on Feb 24, 2009 11:36:58 GMT -5
i'm working on a multi-neck instrument, and wish to have 5 pickups, each with a simple on-off spst switch, each with its own 250k volume control, all controlled by a master volume and tone. all pu's are single coil. when i tried hooking up 3 just to see if this crazy idea would work, i used the Jazz bass style of reversing the leads to the independent pots , but left the master wired normally. it seems to work ok when all pots are wide open but as soon as i turn anything down i get a nasty hum, and the scheme doesn't seem to have the control i'm after. is there a wiring rule that i'm not aware of, possibly overloading the master volume? is this sort of configuration even possible? i halfway based this idea on the Gibson Switchmaster. any help is tremendously appreciated. also, i am using the star-grounding scheme.
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Post by newey on Feb 24, 2009 11:49:33 GMT -5
Strangebone-
Hello and welcome!
I've got more questions than answers for you. Do you get the hum when you turn down any of the volume controls, including the master? Does the hum occur with all positions of the SPST switches?
Sounds like this design has a lot going on in there, probably best if you post a diagram of the wiring, and/or some close-up photos.
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Post by strangebone on Feb 24, 2009 13:03:41 GMT -5
thanks newey for the fast response! #1(top left) seems to hum more than the other two(i'm only using three for now) when its turned partway down, and the master hums pretty bad partway down. this is in any switch configuration. also, pickup #3(bottom left) is silent when all three are hooked up. at first it seemed the switch was bad, but the switch is in fact ok. so there's yet another mystery going on here. i'm also having trouble figuring out how to post the photos i have for you ![]() [/img]... |
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Post by cynical1 on Feb 24, 2009 13:19:55 GMT -5
...I'm also having trouble figuring out how to post the photos i have for you ![]() [/img]...[/quote] Check out the Image Posting link. This should help. Happy Trails Cynical One |
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Post by strangebone on Feb 24, 2009 13:51:49 GMT -5
i hope these help:   |
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Post by strangebone on Feb 24, 2009 14:29:44 GMT -5
here be another view |
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Post by strangebone on Feb 24, 2009 14:39:33 GMT -5
oops wrong one. here's the one  |
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Post by strangebone on Feb 24, 2009 14:46:23 GMT -5
furthermore, the hot leads of the pu's go to the outer terminal of the switch, and the grounds are going to the ground ring terminal. as you can see, i've taken all the outputs of each pu pot and paralled them to a ring terminal that has the other end going to the master volume input. perhaps this is where i've gone wrong?
thanks all, for your help!
s.b.
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Post by strangebone on Feb 26, 2009 17:06:26 GMT -5
so, fellows, we're all familiar with the tutorial on shielding on the Guitarnuts site, right? the first time i studied it i thought there's no way in the world that i could be so negligent as to reverse the hot and ground going to the jack. i even double checked this very thing yesterday when i was extremely stumped as to why i was getting continuity between hot and ground. well i must be "polarity-dislexic" or something 'cause today i triple checked said connection and lo and behold. yes, that's right, you've guessed it. and after making the neccessary correction, y'all wanna know what happened? the darn thing worked pefectly, just the way it was meant to.
Thanks To All Who Showed An Interest,
Strangebone
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Post by newey on Feb 26, 2009 19:14:20 GMT -5
Glad you got it working, sb! And sorry no one jumped in quicker with help. But "output jack" wasn't on my radar screen anyway, so I'd likely just have mislead you. There are 2 types of guitar modders: Those who have wired the output jack backwards, and those who will do so.  |
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Post by strangebone on Feb 27, 2009 4:33:23 GMT -5
thanks, Newey. i'm certainly grateful for your support. there's still a bit of hum when i turn down one of the p.u's, and this i'm reckoning is due to a phasing or magnet polarity issue. the test pickups are 5 different singlecoils of indeterminate origin and once i'm done winding the 5 i'm gonna use i'm hoping that will be easily corrected. when this monstrosity is presentable i'll post some images. all you guys are going to
have a fit over this one, guarranteed! Until Next Time
Happy Plucking,
Strangebone
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Post by cynical1 on Feb 27, 2009 11:51:10 GMT -5
It doesn't look like this, does it?  Please feel free to post images of the finished build here when you've got it wrapped up. Happy Trails Cynical One |
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Post by strangebone on Feb 28, 2009 17:11:09 GMT -5
i sure will.
feel sorry for the poor guys on the couple of stageleft-most necks! i reckon they'd be on the bottom of a pile of people all lying on their backs on top of one another in order to have good access to those upper frets, eh?
s.b.
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Post by pete12345 on Feb 28, 2009 17:30:20 GMT -5
Does anyone know what was that for anyway? Record attempt? Publicity stunt? Would like to see the wiring for that thing... I'd wire all the neck pickups in series, likewise with the middles and bridges, then connect them to a 5 way as you would a single set of pickups. Would be nice and loud |
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Post by newey on Feb 28, 2009 18:31:52 GMT -5
It seems to be an art exhibit: "Present Arms" (2002). Can't make out the artist, however.
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Post by ashcatlt on Feb 28, 2009 21:05:59 GMT -5
I'd wire all the neck pickups in series, likewise with the middles and bridges, then connect them to a 5 way as you would a single set of pickups. Would be nice and loud Would also be nice and dark. It is doable, though, if you're serious. |
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