What's wrong with this diagram?

[hembryguitars]

static.zoovy.com/img/guitarelectronics/-/wdu_h5r00_01

I've tried wiring this a few times now and get a lot of hum.

[JohnH]

Its too late in my day to analyse it, but it is not good. The north coil is hanging from hot, even when it is not in use. The volume control is reverse wired for no good reason, since the only reason to do this is with two volume controls. Hence I suspect there may be other crimes against electronics embedded.
cheers

John

[hembryguitars]

Yes, I noticed the pot being wired wrong (and tried it both ways just to make sure).

I would sure appreceate it if someone could figure this out. Thanks.

[sumgai]

John,

hembry's image is directly from GuitarElectronics.com...... can you believe that?

~!~!~!~!~!~!~!~!~

hembry,

John's correct, of course, that diagram is a disaster waiting to be perpetrated on some unsuspecting young soldering-iron-toting whiz-kid-wannabe. Here's what I found wrong with it (including John's list, just to be complete):

• Volume control wired backwards
  
• North coil hanging from hot in all positions
  
• Position #5 (SOoP), South finish has no connection - position can't work!
  

Discussion:

The volume control wires should be reversed on the IN and OUT terminals (left and center). This will give the optimum results when turning down the volume, causing the amp to see less resistance, thus quieting any buzz or hum as the control is turned down. As it is wired now, turning down the control will not quiet the amp.

Hanging any coil from hot might invite perpetual hum. This is still under discussion here on GN2, but so far, the consensus is, better safe than sorry. The switch should control the North start connection just as it does the others. (There is a complete section of the switch, currently unused, just begging to handle this task.)

The SOoP (Series out of Phase) at Position #5 needs to have Terminal 5 of the South finish section wired to Ground, that will complete the circuit.

If you are getting lots of hum, chances are good that you have reversed the start and finish wires for either the North or the South coils.


Helpful hint:

You can insert an image with the [/img] tags. Just use them like you did the URL link, and you're all set. There is an item in the Add Tags section, just about the blank area where you type in your message. On my display, it's the fourth one from the left, in the lower row.

HTH!


sumgai

[hembryguitars]

I thought it silly, also, to have a choice of either single coil. With them so close together, there is virtually no difference in sound. I digging around some other peoples questions I found this:
I think that will work and I think I should be able to adapt the schematic to a rotary.

[sumgai]

hembry,

That'll work! ;D And yes, it really doesn't matter what physical construction is used by the switch, that's a matter of personal preference - the electrical business is the same for each, as you already guessed.

While I suspect that you'll find yourself using only two or three combos out of the five total, you do need to wire it up and play for awhile in order to find those 'magic' tones. Good luck!


sumgai

[UnklMickey]

hembryguitars said:

I thought it silly, also, to have a choice of either single coil. With them so close together, there is virtually no difference in sound. ....

true.

but, parallel OoP is weak and not all that useful. (and not hum-canceling)

kind of a toss-up as to which one to include in a single HB, 5 sound configuration.

FWIW, having choice of north or south coil could be more advantagous in a 2 HB configuration.

in that case, if the north coil of the first pickup, were combined (in phase) with the south coil of a second pickup,

then, the south coil of the first pickup would be combined (OoP) with the south coil of the second pickup.

that gets you hum-canceling in both cases.


unk

[hembryguitars]

here's what i've got so far

[CheshireCat]

hembryguitars said:

here's what i've got so far

The diagram looks great! One question: what will the phase cancellation be like on the OOP options? Would that almost wipe out the entire signal?

[hembryguitars]

Oh yeah. It makes the signal very thin.