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Help with simple wiring
- Thread starter grocker
- Start date
- Apr 18, 2008
- 16,013
- 1
- 31,727
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- I'm highly opinionated and extremely self-assured
What don't you like about the Seymour Duncan diagram? It's the standard V/B/T diagram, the only difference is your wire colors may not match Duncan's colors.
Wait a minute...that Seymour Duncan schematic is WRONG! Astonished that SD would publish this, people have been using their site as a reference for years. I didn't think to look at it closely.
Jazz Bass w/ Master Volume and Balance/Blend Control
- Apr 18, 2008
- 16,013
- 1
- 31,727
- Disclosures
- I'm highly opinionated and extremely self-assured
It's not wrong, it's just different. Duncan has it after the master volume, and GuitarElectronics has it before the master volume. The two will behave a bit differently, but only if the master volume is at anything less than 100%.
LOL! @grocker, @Crater, good eyes, you two.
I laughed because I found a similar wonk tone control connection (permanent cap on hot signal) in a Cadfael diagram for the Jack Casady bass that's been used for years and no one noticed. Didn't see it myself for awhile until I really studied the circuit. And there it was, big as life and twice as sassy LOL.
Hopefully no one passing thru here reading this loses confidence in Cadfael or Seymour Duncan. Each put out massive amounts of stuff, so there's gonna be errors. Kind of a "Hey, this is funny, look what I found" thing. Continual paper and software corrections, changes, revisions, updates, etc. are part of businesses large and small.
Now, back to your regularly scheduled thread...
I laughed because I found a similar wonk tone control connection (permanent cap on hot signal) in a Cadfael diagram for the Jack Casady bass that's been used for years and no one noticed. Didn't see it myself for awhile until I really studied the circuit. And there it was, big as life and twice as sassy LOL.
Hopefully no one passing thru here reading this loses confidence in Cadfael or Seymour Duncan. Each put out massive amounts of stuff, so there's gonna be errors. Kind of a "Hey, this is funny, look what I found" thing. Continual paper and software corrections, changes, revisions, updates, etc. are part of businesses large and small.
Now, back to your regularly scheduled thread...
The S-D diagram is definitely wrong. The tone pot won't do anything. It looks like they started to get it right but then put the line for the hot signal in the wrong spot. There's a little black dot on the middle pot lug where it should be, but they connected it to the end terminal where the cap was instead. It literally won't do anything when wired like this, not to mention that the cap is in the circuit 100% of the time since it's straight from hot to ground.
Here's a different S-D diagram for the same exact vol-blend-tone config that has a "correct" tone pot:
Here's a different S-D diagram for the same exact vol-blend-tone config that has a "correct" tone pot:
Specifically, notice the cap is directly connected between hot and ground. A direct, uncontrollable, permanent bleed-off of high freqs. Also notice, there's no connection at all to the middle lug. All in all, a totally wonk connection LOL.
I occasionally do put a (very small) cap across the signal like that in addition to the actual tone control, as a way to set a baseline tone - especially with really harsh pickups that are just begging to have the very top rolled off. But yeah, it's not a functional tone control like that!
- Apr 18, 2008
- 16,013
- 1
- 31,727
- Disclosures
- I'm highly opinionated and extremely self-assured
- Apr 18, 2008
- 16,013
- 1
- 31,727
- Disclosures
- I'm highly opinionated and extremely self-assured
- Yes, except there is no standard for wire colors, and
- When combining pickups from two different manufacturers, there’s a 50/50 chance they will be out of phase. The fix is to swap the hot and ground on one of the pickups, but there are shielding considerations too - we can elaborate if the coin comes up tails for you.
That Aguilar pickup has black, white, and gray wires. Use white as hot and ground gray and black. Essentially it matches the colors in the S-D diagram but has the extra gray wire that should be grounded.
The Bart has a single conductor cable with a shield sleeve. The conductor (wire) in the middle should be used as hot and the braided sleeve should be grounded. The center wire is treated like the white wire in the diagram and the braided shield is treated as if it was the black wire in the diagram.
If you wire it up, and putting the blend pot in the very middle suddenly makes the bass super quiet and trebly, then the pickups are out of phase. Fix it by swapping the black and white wires on the Aguilar pickup. You can't switch polarity on the Bart without introducing extra noise, since the shielding isn't wired separate from the coil ground. That Aguilar pickup, on the other hand, has the shielding and coil separated (which is why there are two wires run to ground). That gives you the flexibility to switch the polarity of the pickup if you need to.
The Bart has a single conductor cable with a shield sleeve. The conductor (wire) in the middle should be used as hot and the braided sleeve should be grounded. The center wire is treated like the white wire in the diagram and the braided shield is treated as if it was the black wire in the diagram.
If you wire it up, and putting the blend pot in the very middle suddenly makes the bass super quiet and trebly, then the pickups are out of phase. Fix it by swapping the black and white wires on the Aguilar pickup. You can't switch polarity on the Bart without introducing extra noise, since the shielding isn't wired separate from the coil ground. That Aguilar pickup, on the other hand, has the shielding and coil separated (which is why there are two wires run to ground). That gives you the flexibility to switch the polarity of the pickup if you need to.
Thank you very much to everyone who took time to help me out,i appreciate everyone.
