Help on DOD FX86 (general question)

[vince]

Hello guys
I have a little problem...Very simple but weird

A friend of mine sent me a DOD FX86 that didn't work anymore...I didn't find the problem right away, so I decided to draw the schematic. The distortion part resembles very much another shematic that I found on the internet that only has the distortion part, not the whole circuit, with switching. But my problem is the following: All the FETs that I encountered on the circuit seemed to be inversed. I mean, the drain (D) inversed with the source (S).
I am very upset about that.. I overlooked about 10 times the pinout of the FETs on the web, and the letters D S G are even printed on the circuit board, so I can't go wrong.  Just have a look at the schematic that I drew, you'll see,  it doesn't make sense! Anyone has a clue?

here's the schematic (copy-paste the link):

http://vbinette.tripod.com/DODFX86.wmf

Thank you
Vincent

[j0shua]

I have the Fx86 Schematics

here is : http://photobucket.com/albums/v669/teknoblaster/?action=view¤t=fx86.jpg

[vince]

Hello
I have that schematic too.
I'm just wondering why I see the FETs inversed on my board. I know it's impossible...
Thanks
vince

[j0shua]

of course is not inverted.... you wana know the mod of my old american metal pedal , Uff hehe is on my closet since 2001 ..... i loose the schematics , if you can take some pics of him ( PCB ) y can edit to tell you what i change

1 of the mod : i change the switch for 1 DPDT hehe, is better

[strungout]

Hmm I thought gate and source were interchangeable?

[Gladmarr]

I think it's the source and drain that are interchageable.  That would make that circuit board and diagram agree again.  

[Paul Perry (Frostwave)]

yeah, source and drain are (sometimes) identical, depending on how the fet is designed.
Even if they aren't the same, it might be that the 'other' way around is better for switching (low input capacitance or whatever).