RED WITCH FUZZ GOD II PCB layout

[rocket88]

Crazy question. Any chance of borrowing it again and snapping some pictures of the board, components and wiring? If some that would all more of us to help figure it all out. Good job so far, btw.

[jondog]

Unfortunately no, Borrowed it from a guy I used to work with. He went to a new job, as did I. No contact info.

[jondog]

This is the only picture I could find online

[jondog]

I've reworked my schematic having another look at my layout and found some connections I think I traced wrong that I couldn't really see because they were under an SMD component. I'm not equipped for SMD so I wasn't going to unsolder any of them! I think my new schematic makes more sense. I'll test it when I get home.

[negativefx]

Ugh, a massive PCB (particularly for SMD!) with what appear to be pots directly soldered to the board.  How much do they charge for this thing??

[jondog]

The price is RIDICULOUS! I think $275 US.

[jondog]

I've got a pretty good working model of it on breadboard. Sputta works (although I'm using a linear pot instead of logical which might work better), wrath works. Not sure if my resistor valus are correct though. Good news is I found a Fuzz God in the classifieds for a decent price and it's being shipped today hopefully.  Hope o get a better look at the values. I'll just sell it when I'm done with it.

[rocket88]

Awesome. Once we know everything I correct and finish the layout. This will be one great effect to build. Great job.

[negativefx]

LOL, that must be to cover the cost of the 30" x 90" pcb fabrication.

[jondog]

Got the pedal today. Don't have time to go in depth with it, but it appears all my resistor values are correct, just the schematic is probably not drawn right. Gave it a quick test side by side with my breadboard lay out and they sound pretty close. Actually mine sounds thicker and heavier!

[jondog]

This is what I came up with, not much different from my original, but I see where I may of went wrong with the Fuzz control.

[jondog]

Did a bread board layout of this schematic this morning. It's a winner! Side by side work-alike of the Fuzz God ll. Guess I just had the fuzz control wired up wrong in my original schematic.

[rocket88]

Awesome. I'll correct the layout when I get home and post it in the usual place.

[jondog]

Side by side they sound quite the same. I am using different transistors. One thing I might suggest is playing with cap values on C4 and C6. The treble switch doesn't do much but a very slight almost unnoticeable difference. I put a 22n and a 220pf. I think C$ is supposed to be 22n, not 2.2n. Sounds more the same with 22n. Put the pedal up for sale and it sold within a half hour! Thought I'd be stuck with it for a while. Got all my money back on it!

[jondog]

Haven't tested yet

[Heath]

Heh, the stripboard looks smaller than the PCB.  

[jondog]

1/3 the size!

[rocket88]

I'll still get one up, and try to make it even smaller if I can . I haven't had time since yesterday was my gf's birthday, and today had to stay late to get my kits to work on an engineering project for a competition. Hopefully I can get it done tomorrow. My goal is no more then 20x10.

[negativefx]

Buahaha, I thought the same thing when I saw the PCB... "Wow, this'll be tiny on vero"  Layout is great, but I suspect someone is going to post a much smaller one soon.  SHO sized!  :P

Edit: yep, rocket's on the case.

[Synsound]

Is it possible that the 100k , that is switched in and out for the gain boost, should be a lower value?
From what I can tell, when the 2 switch leads are connected the input signal is bypassing that 100k. On my build all is fine when that is the case. When I switch to where that connection is broken and the 100k comes into play my sound is dropping way beyond usable levels. On the demos they speak of that switch doubling the gain. If this is the case and not just generalizations on the demo a 1k would accomplish it.