SOLVED 2-in-1 build, only one side works

[caiofilipini]

Hey all,

I'm building a 2-in-1 overdrive pedal, a Mach 1 on the right side and a Pauper on the left side. I wired everything according to this diagram:

2-in-1 Pedal Wiring - PedalPCB Wiki

wiki.pedalpcb.com

The only difference is I'm using the 3PDT breakout boards, but AFAICT it should be pretty much the same, as long as the output of the first breakout board is connected to the input to the next board, which is what I did. Also, due to space constraints, I used a 4-pin header to connect the Pauper's breakout board to the main board.

Here's my build:



The Mach 1 (PCB on the left-hand side of the picture) works when engaged, but the Pauper doesn't. Bypass signal works fine, which tells me the jacks are wired correctly. I also checked for voltages on the op amp and all diodes in the Pauper, as well as continuity between all offboard connection points, and also between the pin header and the 3PDT breakout board, and everything looks good AFAICT.

Did I overlook anything obvious in the wiring diagram? Any other obvious places I should check next? Also happy to provide more detailed pictures if it helps.

Appreciate the help, folks!

 

[HamishR]

What's going on with the caps lower left on the Pauper? It looks like there are too many for the board! Maybe it's just the angle of the photo. Are you missing a cap there? On the docs it shows 6 caps but I only see 5.

 

[caiofilipini]

What's going on with the caps lower left on the Pauper? It looks like there are too many for the board! Maybe it's just the angle of the photo. Are you missing a cap there? On the docs it shows 6 caps but I only see 5.

Oh man, how in the world did I miss that?! Well, I know how, it was 3am when I finished this. I'll install the missing cap and see if it works.

Thank you, @HamishR!

 

[caiofilipini]

That was it, @HamishR. Installed the missing cap and it fired right up. Sounds great! I'll post it in the Build Reports forum after I box it. Thanks again, really appreciate it!

 

[caiofilipini]

The end result:

Dual Drive - Mach 1 + Pauper

Hey all, After a silly issue (thanks @HamishR!), got this dual drive working and it sounds awesome! It's a Mach 1 (Lightspeed) on the right side, and a Pauper (Prince of Tone) on the left side: It wasn't that easy, but I managed to fit them both into a 1590BB enclosure! I used a 4-pin...

forum.pedalpcb.com

 

[HamishR]

Haha! Happens to all of us!