doubleneck jazz wiring

[hembryguitars]

I was hoping someone could come up with a diagram for me.

I'm trying to wire a doubleneck jass bass with a DPDT on-on-on switch and two volume pots. I want one pot to controll the front pickups and the other to controll the rear. I want the switch to choose top neck, both necks, and bottom neck.

It's seems like it should be possible but I just can't figure it out. Thanks.

[JohnH]

I think the simplst way would be to:

1 Draw two completely separate circuits. each with two volume controls
2. Combine the outputs with a 3-way switch as in standard 2 pickup designs
3. Combine the volume controls into two dual gang pots - doesnt change the schematic, but gives you one knob for both front and one for both rear

Theres a clue, but sorry but Im not set up for diagrams today.

John

[hembryguitars]

Yeah. I thought of that, it's just that I have the DPDT switch and regular pots onhand. ;D I'm trying to keep cost to a minimum. It's a guitar I'm bulding for a customer. Thanks though. I really appreciate that there are folks out there who really get into wiring. I've only needed to come here and ask questions a couple of times and people have always been sooo helpful.

[JohnH]

This might do it:



what do you think - and can you follow th schematic - red is pups, blue is pots.

The DPDT on-on-on would need to be the type where, in the central position, the centre lug of each pole is connected to both of its outer lugs at once (as in a normal Gibson - 3-way). The other type of on-on-on, used for things like series/parallel/single switching is different, and makes one side of the switch change as you move to the centre position, before the other side.


cheers

John

[x189player]

Here ya go, this should work:





Note, it's pretty much the same as wiring an LP, except instead of connecting the 3-way to the volume pots, you connect it to the pickup grounds, letting you select whether each neck is connected.

[x189player]

Heh, we're all on it today

[JohnH]

189 - thats clever. Putting the switch on the ground side saves ones side of the switch. It would also make it possible to use the other sort of DPDT (see my post), by ganging the two poles together.

I have one concern with your circuit - the neck which is not in use still has its pups hanging off the output connection, without being grounded. I would worry that that arrangement would pick up extra noise. To see what I mean, put a short length of wire on the end of a guitar lead jack tip and plug in - noisy. Now put it on the grounded sleeve - no noise.

John

[hembryguitars]

Thanks John. 189, very cool.

Appearently the switch was my initial problem. It's the wrong kind of DPDT switch. I got these from a different supplier than I used to and I didn't realize there were a couple of different types out there. Thanks all!