100w 2nd Gen. ODS build

[martin manning]

Here is a view from the top (board photo is reversed).

[DSull89]

So I actually managed to wire it correctly?

[martin manning]

Looks that way to me!

[DSull89]

Cool! Thanks Martin! This thing might actually work when I’m done! Was my assessment of the DIN wiring a few posts ago accurate, too?

[martin manning]

Go here: https://ampgarage.com/forum/viewtopic.p ... 08#p365408 and open the ODS Eylet boards .pdf.
On the last page there is a schematic for the foot switch. What you would do for foot switch only is delete the panel switch and find a place to put the 0.1u cap where it will be across the footswitch switch, from the relay coil negtive to ground. That could be inside the foot switch itself.

[DSull89]

Great! Thanks, Martin! Since I’m running two relays where should I put the second 1k resistor for the footswitch?

Thanks,
Dan

[martin manning]

Both resistors on the relay supply board, like in #124, requires a 12V pin for each function. I opted to put resistors in the foot switch as a standard, so there is only one 12V pin and you can have 3 functions on a 5-pin, and my three button foot switch will work with any amp that uses a 5-pin DIN.

[DSull89]

That’s a cool idea! Is there a wiring layout for that?

[martin manning]

Inside the rebuilt Marshall replacement 3-button foot switch. The three red wires all go from the 12V pin to the resistors, and the LED's are grounded along with the relay coil negative pins (blue, brown, white) when the function is "on."

[DSull89]

Great! So would I have to change any wiring on the supply board or just leave everything as is and wire the footswitch as shown with just two switches?

[martin manning]

Just connect the 12V lead directly to the regulator output on the supply board instead of after the resistor. Don't worry about the regulator, it will shut down if that pin is accidental shorted to ground.

[DSull89]

Thanks, Martin! So just to clarify and to see if I’m grasping this, I need to remove the 1k on the supply board and run the brown wire (12v lead) I have on pin 3 of the chassis din directly to the regulator output eyelet on the board (where I have the green wire running to the regulator tag strip where the relay coils are connected as in the 102/124 layouts)? Sorry if I’m being over analytical, just trying to make sure I understand what I’m doing here. All the help is greatly appreciated.

Thanks,
Dan

[martin manning]

Yes that's it. 12V from the reg to the DIN connector, and route that pin to each LED-resistor pair.