mosfet boost not working with other pedals

[mills]

Hi, and sorry for another mosfet boost debugging thread, but this is a little different than the other.

So, I've made one of these on perfboard before (like last week) boxed it up and it was fine.  Gave it to a guitarist, and bought a tonepad PCB to make one for myself.  I put it together (minus milenium bypass) and plug it in guitar>boost>amp.  Works and I'm happy.  I try to slide it into my pedal board and get nothing... no signal when bypassed or turned on.  (its got a 3PDT, and I've checked the wiring on that like 4 times now)...   happens with battery or with a 9V adaptor.  I assume its some kind of grounding issue when its in line with the other pedals, but I've gone over the circuit a bunch of times and can't seem to see where i'd be going wrong...

Two things about it though, I just went through the other mosfet boost debug thread and compared voltages to what R.G. was advising they should look like.  Mine seems to be in the ballpark, although I read in another thread that the gate should be 2V higher than the source...  mines about 1.5 V difference, but it seems to work fine.  So I don't really think there's anything wrong on the board.

The only thing that I really did differently in this build versus the last was solder most of the grounds to the input jack sleeve, and then that to one of the two ground pads on the board.  (I used the other ground pad for the DC jack ground out of habit before I noticed there were only two)  I think that that shold be fine in theory though.

Hopefully someone can offer a suggestion, I don't really even know where to go from here to figure this out and its bothering me being such a simple build and all.

Thanks!

[aron]

hmm try putting just one pedal before and after and see if it still works. Use batteries for your tests to keep it simple.

[mills]

Well, turns out it was the stupid answer in the end...  first time I've ever had a bad cable.     Works great now... a little more hum than I'd like on a daisy chain, but thats an issue for another day!

Thanks for the suggestion though aron, if I hadn't tried that I would've spent the rest of the day trying to figure out how I'd managed to put it together wrong.