Marshall 3 button foot switch in Dumble #102 circuit build??

[mmmoser]

I have nearly completed my Dumble #102 circuit build. I had a generic Marshall 3 button foot switch kicking around and wanted to try and use it but when I opened it up, I see it only has 4 leads coming off the 5 pin DIN plug. Looks like it shares a lead between 2 of the pins- maybe this is something Marshall switching needs. At any rate, the original Dumble design calls for 5 leads and its clear each lead has a separate function and I can't see a way to cheat and only use 4 leads.
My relay setup is the same as the original circuit setup and I am switching PAB and OD for now. Yes, I will have an unused switch in my footswitch but since I have this 3 button job I want to use it anyway. Has anyone figured out a way to make the 5 lead foot-switch circuit work with this 4 lead MArshall style foot-switch?
If not, I could make my own cable I suppose- but what is a good source for sturdy 5 or more conductor cable and the required 5 pin din male/female plugs to do this? After taking so much time to build the amp, I find it strange to be stymied by something like a foot-switch at this point.

[ToneMerc]

It sounds like you either rewire your amp to work with the footswitch or you reconfig the footswitch to work with the amp. Personally, I would reconfigure the footswitch with a 5 pin DIN plug and then use a MIDI cable between the two. However, you could use one B+ string from the amp to feed the footswitch LEDS via the existing 4 conductor and then split it along a B+ rail within the footswitch housing.

TM

[mmmoser]

So the relay B+ supply is only there to give power to the LED's in the foot switch?

[ToneMerc]

So the relay B+ supply is only there to give power to the LED's in the foot switch?

No and yes; if you wired it like 102 then from the relay supply you would have 3 feeds. One at the front of the chassis that supplies B+ to the relays and two strings leading towards the rear of the chassis that feeds each relay LED. However, if you are not using LEDs in the footswitch then you don't need B+ at the footswitch and you only need to make or break the ground connection side of the relays. When you stated that you wired it just as the original setup, I took for granted that you are using LEDs in the footswitch.

So to connect a the LED footswitch you needs 5 conductors; one for the ground, one each for each LED B+ and two switch return conductors. You only have a four conductor cable so you will have to power both LEDs from only one of the B+ LED feeds that terminate towards the rear of the chassis. Instead of sending two separate B+ feeds into the footswitch, you will only send one. Referring to the previous diagram, there's only one B+ that feeds all the LEDS inside the footswitch housing.


No LEDS on footswitch, just switch the relay ground side as seen below.


TM

[Structo]

I never understood why Dumble would run two B+ wires to the pedal?

I have a three button switch and I just run one B+ and a ground.
Then three wires for switching Mid Boost, OD and PAB.

I'm pretty sure this is how I have mine wired.