PCB RFC - Grindhaus Fuzz

leadfoot

leadfoot

Well-known member
After seeing the DOD Grindhaus Fuzz show up in the wish list section and reading up on it and figured I'd make a version of it.

I based it off of the Hype Fuzz from FuzzDog, tossed in the Big Muff tone stack (with the ability to bypass), and then the make up boost as seen in the DOD Grindhaus documentation.

I've attached the schematic circuit and the pcb routing and would like feedback on how to make it better. I'll be using a ground pour on front and back to handle the grounds. When it is all done, I'm using the mad bean suggested trace sizes for power and signal.

I'll be happy to share the gerbers so others can make it as well.

Thanks!

Schematic:
Grindhaus Fuzz - Schematic.jpg

PCB:

grindhaus-fuzz-pcb.png
 
Nice! I'm no expert so take all of this with a grain of salt. I also mostly route SMD layouts but I think most of the advice will hold.
Some specific feedback:

- Kicad's default track width is soooo smol. Even with SMD components I try to keep my trace width at 0.5mm instead of the default of 0.2mm.
- Try to avoid routing back side if you can. The less stuff you have on the back, the better your ground pour. I see a few places where you're routing on the back where you probably don't need to.
- Don't be afraid of routing longer than you need to, even routing around the outside edge to avoid crossing. I've found that it works well for me to route 9V or VREF around the outside edges since that often needs connections on various places around the board.
- For example pin2 of upper left pot could go all the way around the outside to output to avoid crossing thru the middle of the board.
- Likewise for the input.
- (And it almost feels like the input half and output half want to be switched, since the output comes in on the right but is controlled by the left pot, and vice-versa. Maybe not that big of a deal but then you potentially have more crosstalk)
- C11 is near, but not on, the center line of the board (eye twitch)
- For the silkscreening, it can be nice to have the component value visible after population so you don't need to bring a map when you are trying to diagnose something. But I do see a lot of through-hole designs like this.
 
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