This pedal wiring mist have been done before?

[stallik]

Call it a senior moment but I'm struggling with the off board wiring of a dual circuit pedal.

I have 2 (different) 808's in one box with 3x 3pdt foot switches. First is bypass, second selects circuit A or B but I want to use the third to give me A into B then out.

This just has to have been done before but my searches turn up empty. Perhaps I'm using the wrong search phrase....?

[Kevin Mitchell]

Uhg my head
I think the big headache is trying to factor in the "series" stomp switch after the AB. You'll want to figure out how to swap the circuits with the AB and have the series switch select between the signal in-between the circuits or the signal at the end. That's the most simple way I can think of. But my drawing became a spaghetti monster real quick 

[antonis]

Is it OK Kevin..??

[Fancy Lime]

So you want either both off, only A on, only B on, or A and B both on in series? I don't think that has been done with three footswitches because you can get the desired action with two on-off switches for the separate circuits and I have difficulties imagining how the scheme you suggest would be more convenient to operate. It can be done very simply though, I think. Have a look at coil splitting switch wiring for humbuckers.

Andy

[Rob Strand]

From what I can see you want switches,
Name                         Function
- Bypass:                   Bypass acts as bypass/effect for whole device regardless of the state of the other two switches.
- Series:                     Put effects in Series mode (A then B), or select Single mode (as per single switch)   
- Single Select:         Selects with of A or B operates under Single mode

There's many options how the LEDs could work.   The simplest for the user is two LEDs, LED A and LED B.
- Bypass:                  None, overides other settings
- Series Mode:         Both LED A and LED B on
- Single Mode:         LED A or LED B as per Single Select.

One detail which affects the switching is what happens when a single pedal is selected and we are not bypassed.  Do you want to allow the inputs of both pedals A and pedal B to be connected simultaneously, or, do you want the AB switch to switch the inputs as well.    Normally you would want the first case but that means the series mode needs to hijack both the PCB-A and PCB-B and then completely reconfigure the inputs and outputs - that means more switches.   In the second case we can assume the input of A is always connected so the select switch only needs to select the outputs and the series switch only needs to force the output from B and connect the input of B to the output of A.   By simplifying the switching you could use two diodes on the series mode switch to LED A and LED B.

[iainpunk]

can't we just get the same functionality with two standard bypass switches. it basically does either A or B or both in series.
also saves a 3pdt.

cheers

[Rob Strand]

can't we just get the same functionality with two standard bypass switches. it basically does either A or B or both in series.
also saves a 3pdt.

If you wanted you could add overall bypass around that conventional configuration.

The only thing you lose over the intended version (as I understand it) is the ability to go from A to B with one footswitch.  You have to turn A off then B on (or visa versa).   If that's the whole reason behind the intended version we have gone in a loop.

[stallik]

Wow! Thanks for all the replies. Only just woken and can't yet get my brain around your diagram  Antonis. Rob, you're correct. The whole idea is to go from A to B in one tap. I've been using it this way (with two switches) and really like the way it works. The only thing I can't do is to stack the effects together.

I had considered adding a third 808 board just to add to whichever of the others I have selected but was trying to avoid the extra knobs.

[anotherjim]

So long as the series order of the two is fixed, I'd treat them as two independent fx each with its own 3PDT bypass. No 3rd switch. By positioning the switches carefully, you can toe either or both together. An option is to put them inline front to back instead of side by side.
In the box, the A switch input is from the input jack and the output goes to B switch input. B switch output to the output jack.
A second 2 switch approach is if the A circuit is perfectly happy always driving the B, then they are hard-wired in series. Switch A is the overall bypass and switch B selects A or B to the output jack. B switch can be a 2PDT as only one pole is needed for the signal switching.

[antonis]

Only just woken and can't yet get my brain around your diagram  Antonis.

My diagram is for 3 individual effects but you can utilize it for only two of them..
Just like Jim said..!! 

So long as the series order of the two is fixed, I'd treat them as two independent fx each with its own 3PDT bypass. No 3rd switch.

[Fancy Lime]

Does it have to be true bypass?

[stallik]

True bypass was the way I'd been heading. Jim, I like the idea of hitting 2 switches at the same time but I'm restrained by using an old enclosure with switches too far apart for my tiny feet. Antonis, your grounding schem looks great but will cause me issues if an effect is grounded by one switch and then I try to switch it on with another.. but.

Seems I've been rubber ducking. Just drawn out new wiring in diylc and by adding a single relay, I think I can get what I want. Having a cuppa, checking the schem and then turning the iron on

Let you know how I fare and, if it works, I'll post the schem

[Kevin Mitchell]

Is it OK Kevin..??

No it's not okay 

[stallik]

I have the switching working as I want it, the only issue is that I'm using a 12v relay powered from 9v which works - till I also switch an led in parallel with the relay. Then it becomes a bit flakey.

[stallik]

All working now

Wiring


Outside


Spaghetti