Does anyone have a schematic for a HSS guitar that uses 500K pots for humbucker, and 250s for SCs? Is there some clever way to do this that uses 500K pots but then adds resistance when SCs are selected?
Making the singles see 250K on an HSS with a 500K volume is pretty easy; you'd use two 470K resistors.
One attaches to the lug on your switch where the neck pickup connects.
The second attaches to the lug where the middle connects.
Both run to ground, on the back of a pot or wherever is most convenient.
It's possible to use two separate pots instead - a 250K/500K stacked pot is available too. But I think it's simpler just to use resistors.
For that matter, is there a way to do a coil tap of a HB, and have it sound like a strat with correct pots?
It only takes one half of a DPDT switch to coil split a humbucker. I don't see why you couldn't use the other half to engage a resistor to ground.
It would go from the switch lug where the hot lead of the humbucker attaches, to the unused half of the DPDT, and from there to ground.
FWIW, I haven't seen this done - when players split a bridge they generally want it bright.
Frankly I'm not sure it'd be worth the trouble. If it were, I think more folks would probably be doing it.
The thing is, you can't really get a low output humbucker to sound Stratlike when it's split.
Some of the high output hums split rather well, but in this case that isn't an option.
Vintage output humbuckers sound weak when split. It's intrinsic to the design, so you'll probably want "resistor split" wiring.
This simply puts a resistor between the split switch and ground.
What it does is keep some of the second coil in your output: it's cleaner than full series but not as wimpy as a full split.
PRS uses a 2,2K resistor on bridge pickups and that value generally works well for PAF types.
But you could go higher (or lower) if you wanted more (or less) body in the sound. They use 1.1K on neck pickups, for instance.
If you're doing split wiring, it might also be worth it to wire for autosplit in position two.
You'll get a brighter tone sound in that position, though it won't be true Fendery quack.
(This would only involve one extra wire.)