Coil Tap on a Pot?

thegummy

I have a pickup that has a coil tap and normally the extra windings would be brought in by a push switch that switches between the full pickup and the tap.

Is there a way to possibly wire it up so that the extra windings are gradually brought in with a pot? So instead of either full or tapped, it would start tapped then it would be like a "boost" control that gradually gets louder and louder?

Obviously it wouldn't actually introduce the extra windings gradually, it would introduce them all but with a lot of resistance at first and the resistance would gradually decrease as the pot is turned?

Danny1969

You could wire the centre joint of the coils to one centre lug  of a pot and the end of the pot to ground ... that would kind of do that but I expect @ICBM has a better way of doing it 

TTony

Blend pots?

SteveRobinson

Seymour Duncan call it "spin a split"
https://www.seymourduncan.com/blog/the-tone-garage/guitar-wiring-explored-the-spin-a-split-mod

ICBM

Danny1969 said:

You could wire the centre joint of the coils to one centre lug  of a pot and the end of the pot to ground ... that would kind of do that but I expect @ICBM has a better way of doing it 

No . That’s exactly how I would do it - except that for a tapped (rather than split) pickup you want to connect it to the pickup hot and not ground, or you get the wrong part of the winding normally.

For it to work properly you need a Log pot, but it doesn’t matter much if it’s 250K or 500K.

thegummy

ICBM said:

Danny1969 said:

You could wire the centre joint of the coils to one centre lug  of a pot and the end of the pot to ground ... that would kind of do that but I expect @ICBM has a better way of doing it 

No . That’s exactly how I would do it - except that for a tapped (rather than split) pickup you want to connect it to the pickup hot and not ground, or you get the wrong part of the winding normally.

For it to work properly you need a Log pot, but it doesn’t matter much if it’s 250K or 500K.

Cheers man.

So just for clarification, it's not a split humbucker but a tapped single coil.

So could you just go over again what connects to what for that one?

ICBM

Simply connect the full output and the tap to the two terminals on the pot that you would use if it was a tone control. (Centre and counterclockwise.) It doesn’t matter which way round.