Schematic and info avaiable at Deadend Fx
**Edit 220421* Deadend Fx recently traced this circuit and it turns out that the initial traace and schematic posted at Ilovefuzz forum had some bugs. Layout below is based on the most recent trace. Notice that it is highly recommended to so socket Q6 and Q7 since you'll likely need to go through a bunch of transistors to make the fuzz section operate properly. See voltages in the build doc above.
**Edit 220421* Deadend Fx recently traced this circuit and it turns out that the initial traace and schematic posted at Ilovefuzz forum had some bugs. Layout below is based on the most recent trace. Notice that it is highly recommended to so socket Q6 and Q7 since you'll likely need to go through a bunch of transistors to make the fuzz section operate properly. See voltages in the build doc above.
Hey man I have a idiotbox dungeon master sitting around..would you be interested in doing a layout for that..i can send it to you if that helps
ReplyDeleteCool!. Would love to find out whats inside of it and build a clone since it sounds awesome.
DeleteIt might be traceble by pics, a multimeter on your behalf and our assistance. Is it possible to take high resolution Pictures of both sides of the board?
If it turns out that it wont work you could send me the pedal if you are in Europé. If you are in the US I know some people that might be willing to help us out.
Awesome whats your email
ReplyDeleteanders.sjodal@gmail.com
DeleteCouple errors maybe.. bottom mix2 should be mix1, the 1n next to the 68k over by in3 is a 10n in the schematic and Q8 next to D1 should be Q7. I built he non charge pump model and it works, but something g is wrong. It's all misbiased and weird sounding. I'll keep looking. The bias of the J201 seems huge too .
ReplyDeleteAlso the 470k pulldown is before the 100n in the layout, but after in the schematic- I just dropped it to the bottom of the 100n and did a standing resistor to the ground rail 3 rows down
DeleteThanks for giving it a go. Will fix the 10nF cap and the labels in a couple of days.
DeleteNot sure about the pulldown resistor though. There is a 1M horizontal pulldown resistor before the input cap. The 470k resistor needs to connect to gate of Q1 to bias it up.
Yes I mean at the output sorry. Having the 470k inside the 100n puts it in parallel with the output pot and changes that somewhat.
DeleteLayout is updated.
DeleteSo what is it that makes it sounds wrong?. An overall misbiased sound? Erratic decay?
Some updates on the ILF thread about this. Dig2t posted his version of the DN here - looks to have some change to the EYG version.
ReplyDeletehttps://drive.google.com/file/d/156JFXVwj6Jt65MFF6aLoMADtHWMzEhl-/view
Thanks for the heads up.
DeleteBy a quick glance there is a few cap and resistor value changes. And some socketing to do for Q6 and Q7,
I'll update the layout in a couple of days. Will give a shout out when it is done.
Layout has been updated reflecting the latest and accurate trace by Deadend Fx.
ReplyDeleteI think Q6 and Q7 are swapped, they are reverse biased in the schematic like DBA does, and why they are so hard to match.
ReplyDeleteThank for spotting that, eagle eye. Layout is updated.
DeleteI've been working on this circuit for months. I kind of just want it to go away lol. I'll keep at it
ReplyDeleteWell I think it's safe to say this is verified. I've got it working and everything sounds good, but I'm still sorting MPSA18s for Q6 and Q7, but I have a couple that are pretty close to the deadend voltages.
ReplyDeleteFinally! Great job! Glad you managed to get this "circuit-of-tears-andmisery" working.
DeleteSo what do you think about it? Does it reminds you of other fuzzes or has it its own thing going on?
Tagged!
It's pretty fun I guess, it's the quintessential "clang" pedal but I think stuff like the HEQ-1 does it better. I also added the deadend mods to mine by connecting a toggle between the negative side of the 10u at Q2 and the base side of the 1n at Q5 with a 10n and a 680n, and then put that 1n also on a toggle as a bigger value adds more gain to the high side.
DeleteI've been curious about this one. What about using it stacked with another drive, mostly after another drive. An owner told me it worked best for him that way.
Delete