Using a toggle to switch a pair of pcbs between series and parallel

[Nitefly182]

Is it possible to use a toggle switch to change the routing of two pcbs between series and parallel. I searched around and it seems that other people have asked the question before yet no one has ever supplied an answer. Im trying to build a pair of delay circuits in one enclosure with one bypass switch and a toggle to swap them between series and parallel routing. I have seen a few pedals with this feature (Blackout Effectors Dual Fuzz, Red Witch Titan delay) but Im not sure how the wiring works. Can anyone provide a diagram? Thanks!

[Rich_S]

You can do series/parallel with a basic DPDT toggle switch.  My brain's in no shape to draw it up right now, but here's a link to a diagram on the Seymour Duncan website.  I has a series/parallel switch for a humbucker - same thing, if you subsitute your 2 delays for the 2 pickups coils.

http://www.seymourduncan.com/support/wiring-diagrams/schematics.php?schematic=1h_1v_1t_sp

P.S. You'll need this hint:

    Black  = PCB #1 Input
    White = PCB #1 Output
    Red    = PCB #2 Input
    Green = PCB #2 Output

[Nitefly182]

Thanks!

[Nitefly182]

Actually now that Im looking at this diagram Im not sure how it can work. The pickups in the diagram dont have an input like an effect so while I would be switching the pcbs between series and parallel Im not sure where I would input the guitar signal into this equation.

[moosapotamus]

This is a bit simplified, but I think you can use a DPDT toggle switch wired like this...



Maybe?

~ Charlie

[Processaurus]

Interesting idea, so the circuits would be inserted right before the opamps +inputs.  Charlie's drawing will need series resistors right on the outputs of each opamp (470 ohm or 1K will work fine), so that in parallel, the opamps outputs won't fight each other to the death, trying to wrestle the opposite opamp's output to what it sees on its own + input.



Note, the top opamp should have its + and - inputs swapped, so the IN goes to pin 3, and the feedback goes to pin 2.

[moosapotamus]

I gust drew that up real quick, using the opamps to indicate two different PCBs, which was Dave's original question. Should have shown it like this...



I was thinking of wiring two Rebote PCBs together like this for dual delays with a serial/parallel option.

The switch is a DPDT toggle. In the position shown (parallel), the input goes to the input of both PCBs and the output of both PCBs is combined at the main output. Move the switch to the other position (series) and the main input only goes to the input of PCB 1, the output of PCB 1 goes to the input of PCB 2 and the main output comes from only the output of PCB 2.

This is just intended to show how the switch would be wired. You may need additional buffers, mixing resistors or...?

~ Charlie