DOD FX33 Buzz Box

[Alex]

I add this one here cause the schematic is not verified (will move it eventually)
Came out quite large.
Hope it works!

[Hozy31]

Am so going to have to build this. Just clocked a video on YT and it sounds like a fun beast. Thanks Alex.

[mirosol]

Built it, works - but there are number of issues with the unverified schematic. For example, the stray bypass path buffer transistor is in the sgnal path. And there are tons of values wrong.

I took the liberty of snipping the factory schematic to suit true bypass. This should yield smaller layout and higher success rate.

[Sphere80]

They used a Grunge (pre tonestack) for the distortion half of this.  If you ever want to lay out the Metal Zone, or  any of the 5 or so DOD  pedals  derived from the Grunge, most of your work is done.

[Alex]

Hi Miro.
Did you try to sub the new values and eliminate the extra transistor?
There are also a couple of reversed Elec. Caps compared to the other schematic.

[mirosol]

Tried bypassing the extra transistor stage. Got it to sound somewhat closer, but not completely right. Need to go through it at least once more before saying anything more.
+m

[Hozy31]

Ok i Built this one, completely forgetting about the comments, and mine is only just slightly different from the videos. It feels like it just needs a tiny tweek. Could the JFET voltage at the drain be playing a role? Mine measures 4.11v.

EDIT: Its sounds really really good though.