Toggle switch to select effect switching

[ElectricDruid]

Could it be that both pedals are now in the same chassis (1u rack) and share a same ground (the chasis)?

I don't think that makes sense. When the pedals are connected "normally" (e.g. chained together with cables) their grounds are also connected, so if connecting grounds up was an issue, that wouldn't work.

If it's following that specific pedal, there must be something interesting about it! How does it differ from the other one?

[Rockers Rollin]

Could it be that both pedals are now in the same chassis (1u rack) and share a same ground (the chasis)?

I don't think that makes sense. When the pedals are connected "normally" (e.g. chained together with cables) their grounds are also connected, so if connecting grounds up was an issue, that wouldn't work.

If it's following that specific pedal, there must be something interesting about it! How does it differ from the other one?

It differs fairly significantly, the board is completely different. I'm not even sure where to start with it being different. See photos:

Effect (LS-2) 1:


Effect (LS-2) 2:


The obvious one is, as I say, the difference in switch wiring, but, at the end of the day, it's still a momentary.

I don't get how it works on its own with the remote momentary, but as soon as I wire in the other effect, it starts this odd behaviour.

[Rockers Rollin]

I think I'll have to try and source an LS-2 that matches the first one 

[GGBB]

I think I'll have to try and source an LS-2 that matches the first one 

It will probably be easier and a lot cheaper to just use a double pole momentary switch.

[Rockers Rollin]

I think I'll have to try and source an LS-2 that matches the first one 

It will probably be easier and a lot cheaper to just use a double pole momentary switch.

I'm not familiar with a double pole momentary switch. Does this operate just like a spst momentary except it switches both poles at the same time?

[ElectricDruid]

I'm not familiar with a double pole momentary switch. Does this operate just like a spst momentary except it switches both poles at the same time?

Yes, exactly. You'd only need a DPST, but there are DPDT examples:

https://www.banzaimusic.com/Pushbutton-Footswitches-Momentary/

GGBB has a point - from here, a switch like this is the simplest and easiest way to fix the problem.

[Rockers Rollin]

I'm not familiar with a double pole momentary switch. Does this operate just like a spst momentary except it switches both poles at the same time?

Yes, exactly. You'd only need a DPST, but there are DPDT examples:

https://www.banzaimusic.com/Pushbutton-Footswitches-Momentary/

GGBB has a point - from here, a switch like this is the simplest and easiest way to fix the problem.

Thanks, I'll look at this.

Currently I have the wiring from the DPDT toggle to a feamle mono jack. I then connect a standard guitar/ instrument cable to the remote momentary. I guess using a DPST momentary I'd need to change to use a 4 core cable and respective jacks?

[GGBB]

Currently I have the wiring from the DPDT toggle to a feamle mono jack. I then connect a standard guitar/ instrument cable to the remote momentary. I guess using a DPST momentary I'd need to change to use a 4 core cable and respective jacks?

Correct.

[Rockers Rollin]

Currently I have the wiring from the DPDT toggle to a feamle mono jack. I then connect a standard guitar/ instrument cable to the remote momentary. I guess using a DPST momentary I'd need to change to use a 4 core cable and respective jacks?

Correct.

I've just found a DPDT momentary I order by mistake a while ago. How should this be wired?

[GGBB]

https://www.diystompboxes.com/smfforum/index.php?topic=129828.msg1256423#msg1256423

[anotherjim]

The two FX you have may be incompatible, but what I would do first is measure the voltage at each side of the existing momentary switches with reference to the common ground you are using. If each one has 0v on one contact and some positive voltage on the other, then the original idea with the diodes ought to work. Since it doesn't work, we may suppose one of the FX uses a different way of sensing the bypass switch. A bypass switch could even be part of the control CPU button sensing matrix for all I know, in which case you can't join either contact across.
Anyway, separating it with a DPST switch solves any problem as nothing has to be common.

[Rockers Rollin]

https://www.diystompboxes.com/smfforum/index.php?topic=129828.msg1256423#msg1256423

So good news, the DPDT momentary switch works.

Only issue is, the switch I have is a (ON) - ON. When an effect is connected to the ON, the DPDT momentary switch controls it, but its dedicated SPST momentary doesn't. Where as the effect connected to (ON) works with both the DPDT and dedicated SPST.

I cant explain this, im not familiar with the switches or what this mean but looks like I need a DPDT (on) - (on).

[GGBB]

https://www.diystompboxes.com/smfforum/index.php?topic=129828.msg1256423#msg1256423

So good news, the DPDT momentary switch works.

Only issue is, the switch I have is a (ON) - ON. When an effect is connected to the ON, the DPDT momentary switch controls it, but its dedicated SPST momentary doesn't. Where as the effect connected to (ON) works with both the DPDT and dedicated SPST.

I cant explain this, im not familiar with the switches or what this mean but looks like I need a DPDT (on) - (on).

I'm not sure which switch you are talking about that is "(on) - on" - the remote footswitch, the panel switches, or the DPDT toggle.

"(on) - on" means "momentary - latching" - when in the default position, the latching side is connected, when switched the momentary side is connected. This is standard for all pushbutton/foot switches. There is no such thing as a "(on) - (on)" pushbutton/foot switch or two position toggle - this exists in 3 position (center-off) toggle switches as (on)-off-(on). In your case you do not use the latching side of the switch - only the momentary side so that the functionality effectively becomes "(on) - off" where off means disconnected.

[Rockers Rollin]

https://www.diystompboxes.com/smfforum/index.php?topic=129828.msg1256423#msg1256423

So good news, the DPDT momentary switch works.

Only issue is, the switch I have is a (ON) - ON. When an effect is connected to the ON, the DPDT momentary switch controls it, but its dedicated SPST momentary doesn't. Where as the effect connected to (ON) works with both the DPDT and dedicated SPST.

I cant explain this, im not familiar with the switches or what this mean but looks like I need a DPDT (on) - (on).

I'm not sure which switch you are talking about that is "(on) - on" - the remote footswitch, the panel switches, or the DPDT toggle.

"(on) - on" means "momentary - latching" - when in the default position, the latching side is connected, when switched the momentary side is connected. This is standard for all pushbutton/foot switches. There is no such thing as a "(on) - (on)" pushbutton/foot switch or two position toggle - this exists in 3 position (center-off) toggle switches as (on)-off-(on). In your case you do not use the latching side of the switch - only the momentary side so that the functionality effectively becomes "(on) - off" where off means disconnected.

The switch I'm referring to is the remote momentary DPDT footswitch.

Perhaps I'm wiring it wrong? The pins are as follows:

X   X              (On)

X   X               -

X   X               ON



Centre 2 pins I'm connecting the grounds, top left is positive effect 1 and bottom right is positive effect 2

[GGBB]

The switch I'm referring to is the remote momentary DPDT footswitch.

Perhaps I'm wiring it wrong? The pins are as follows:

X   X              (On)

X   X               -

X   X               ON



Centre 2 pins I'm connecting the grounds, top left is positive effect 1 and bottom right is positive effect 2

Yes - that's wrong - use top and middle for both sides - don't use the bottom pins.

[Rockers Rollin]

The switch I'm referring to is the remote momentary DPDT footswitch.

Perhaps I'm wiring it wrong? The pins are as follows:

X   X              (On)

X   X               -

X   X               ON



Centre 2 pins I'm connecting the grounds, top left is positive effect 1 and bottom right is positive effect 2

Yes - that's wrong - use top and middle for both sides - don't use the bottom pins.

Yep! I've just realised this that second upon trying it based on your previous comment re not using the latching! 

Many thanks for you're help. Much appreciated! Apologies for the nievity! It's a learning curve!