toddw
Meter Reader 1st Class
Posts: 50
Likes: 0
|
Post by toddw on Oct 14, 2008 15:28:37 GMT -5
I have another wiring question related to using this: www.guitartechcraig.com/techwire/tech13.jpgin a guitar I'm building. I'll put a P-rail in the bridge position and a Lace sensor or some other quiet single coil at the neck. My question is about position 5. I want to wire a push pull pot (DPDT switch) to let me get the coil that isn't available in position 4, which will be the P90 coil. So basically I want to pull the tone knob to get the rail in position 5. I see two options. One, I can use one switch to simply run connect the hot wire on the P90 directly to the hot lead of the rail. That puts the P90 parallel to a wire, but I'm wondering if that will add noise? The other option requires a bit more wiring, but lets me ground out the P90 and connect the rail, with its polarity reversed. So it's former hot lead gets grounded and I'd be connecting the former ground lead to hot through the DPDT. The advantage is I grounded the P90. Seems like I might get an interesting out of phase option in another position with this option, but I'm not sure yet. My real question is whether the first option will be noisier? Thanks, Todd
|
|
|
Post by newey on Oct 14, 2008 16:15:47 GMT -5
The consensus, over numerous threads over the years here, seems to be that the answer is "Yes, perhaps", and that therefore you should use your second option. Also, you might want to take a look at this, which could be simply inverted for use with a bridge HB instead of the neck HB shown thereon: HB and SC w/ std 5-way switchI've been lobbying for some one to build that mod and post their results. (Purely selfish on my part, I want someone to be the guinea pig) ;D
|
|
toddw
Meter Reader 1st Class
Posts: 50
Likes: 0
|
Post by toddw on Oct 14, 2008 20:08:48 GMT -5
Hi Newey,
I'm not sure, but I think that link is exactly what I am using. Not 100% because I didn't compare them side by side, but the options read the same.
Todd
|
|
|
Post by newey on Oct 14, 2008 21:32:50 GMT -5
Todd-
You're right, I didn't look close enough at GuitarCraig's diagram. The only difference I see is at position 4, as listed in your diagram. The one I posted would give the opposite coil from the HB at that position.
I'll be interested what you think once you're done.
|
|
toddw
Meter Reader 1st Class
Posts: 50
Likes: 0
|
Post by toddw on Oct 15, 2008 8:53:53 GMT -5
Interesting thing, Newey,
I just went over EB's diagram and Craigs. In both layouts, you eliminate a coil by tying both it's leads to the hot lead. Sort of makes my initial question academic!
So, with a lace sensor at the neck and a P-rail at the bridge, I'd get these combinations:
EB's diagram {with rail as outer coil in diagram} Lace alone Lace and Rail parallel (sort of a strat position 2 I'd guess) Rail in series with (Lace and P90 in parallel) P90 alone (with both rail leads tied to the hot lead) P-rail in HB mode
Craig's diagram Lace alone Lace and rail in parallel (Same as above but both leads of P90 tied to hot lead) P90 in series with (Lace and rail in parallel) P90 alone (rail and Lace grounded) P-rail in HB mode.
I'm wondering if positions 3 and 5 will be similar in Craig's. The P90 is the higher output coil, so putting it in series with the rail versus the (rail/Lace parallel) could be very similar. That makes me lean towards Emmetts diagram.
What do you think?
Also, here's a rank beginner question, will turning the PUP 180 degrees in EB's schematic, so the outer coil which I'd wire to the rail, faces in, have any effect on phase? Phase I don't understand well yet!
Thanks, Todd
|
|
|
Post by ashcatlt on Oct 15, 2008 21:30:30 GMT -5
...will turning the PUP 180 degrees in EB's schematic, so the outer coil which I'd wire to the rail, faces in, have any effect on phase? No. Sort of. Not in the way I think you're talking. It won't suddenly make it RWRP. It will sense the string in a different portion of it's swing. Higher harmonics will be at different phase angles. This happens any time you move a pickup, and partly explains the difference we hear when switching between pickups. You're not likely to be able to tell much difference in the space of one HB.
|
|
toddw
Meter Reader 1st Class
Posts: 50
Likes: 0
|
Post by toddw on Oct 16, 2008 6:50:21 GMT -5
No. Sort of. Not in the way I think you're talking. It won't suddenly make it RWRP. It will sense the string in a different portion of it's swing. Higher harmonics will be at different phase angles. This happens any time you move a pickup, and partly explains the difference we hear when switching between pickups. You're not likely to be able to tell much difference in the space of one HB. Yeah, I realized after reading more that if the coil is wound counter clockwise, rotating 180 degrees won't change that. I ordered a Lace Hot Gold pickup. They didn't offer a RWRP option, so I guess it's a 50:50 chance it will be hum cancelling with the rail. Thanks, Todd
|
|
|
Post by ashcatlt on Oct 16, 2008 23:35:23 GMT -5
...And another thing!
You're not actually talking about tapping a coil here. You are splitting off one of 2 coils from a humbucker. Wondering if you'd ought to short it to ground or shunt across it.
I think that "coil tap" is fairly commonly misused in this way. A proper coil tap, though, is when you've got a third wire coming out the middle of an individual coil.
Interestingly, the options for using that coil tap are almost identical to those available here. Except that you also have the option (if you've got enough poles on your switch) of disconnecting the unused coil altogether.
|
|
toddw
Meter Reader 1st Class
Posts: 50
Likes: 0
|
Post by toddw on Oct 17, 2008 13:51:54 GMT -5
So the Lace sensor will stick to the P-rail rail, but not to the P90 side. So I know it's reverse polarity to the rail. Any way to tell if it's also reverse wound?
thanks, Todd
Started a new thread to ask this. Sorry. Figured it was something someone might search for again someday. -Todd
|
|