D*A*M - FZ-676 G-Type Fuzz

sinner · Post by **sinner** » 05 Apr 2012, 08:57

I'm on it today, but it's odd fucker. I was prepared for easy draw, as I was expecting Zonk Machine variant as DAM did before (here's the link) but I guess this is not. Firstly, it have few resistors missing and filter control makes no sense to me. I could misplace components in output part of the circuit as well, as it gives even less sense this way. Usually DAM stuff was easy to trace for me, so I fell like a moron asking for assistance with it. Have a look guys.

(*) - is value unconfirmed (can see it)

beedotman · Post by **beedotman** » 05 Apr 2012, 09:34

Yeah... I was thinking about it as well... But didn't have much time recently, so I think You could do the job

Have You traced B-13 Booster?

sinner · Post by **sinner** » 05 Apr 2012, 09:48

I'll do B-13 next. I didn't thinking what it is yet. Doesn't look like Red Rooster when I looked at it at first.

beedotman · Post by **beedotman** » 05 Apr 2012, 10:00

sinner wrote:I'll do B-13 next. I didn't thinking what it is yet. Doesn't look like Red Rooster when I looked at it at first.

I think it is something very similar.
4n7 and 4u7 input cap blend for sure, like in red rooster (4u7 in place of 2u2). I see 100K pot value on photo.
470K (or something like that, I can't see value here) + 56K bias string on transistor base.
F.A.C I think is output capacitor selector.
22u cap on emitter (I think there's hidden bias resistor under OC81D on photo) - 3k9 or something similar.
Second standing resistor is pull down like in red roosters.

G5120fx · Post by **G5120fx** » 05 Apr 2012, 10:00

My favorite Team strikes again! Thx Guys!!

sinner · Post by **sinner** » 05 Apr 2012, 10:11

beedotman wrote:
sinner wrote:I'll do B-13 next. I didn't thinking what it is yet. Doesn't look like Red Rooster when I looked at it at first.
I think it is something very similar.
4n7 and 4u7 input cap blend for sure, like in red rooster (4u7 in place of 2u2). I see 100K pot value on photo.
470K (or something like that, I can't see value here) + 56K bias string on transistor base.
F.A.C I think is output capacitor selector.
22u cap on emitter (I think there's hidden bias resistor under OC81D on photo) - 3k9 or something similar.
Second standing resistor is pull down like in red roosters.

Yeah, fuck... I forgot about Dave's addiction to place components on the other side of the board. Now the fuzz unit oddity can have an explanation. I wonder is this is what's happening here. I wonder too how this will sound with components as is... I really need to but this breadboard one day

sinner · Post by **sinner** » 05 Apr 2012, 10:17

Even if so, and there is something under the board Filter still have no sense to me. It wont mix in anything as is. It looks more like taking cap to ground.

I need to keep tantric practice more often

beedotman · Post by **beedotman** » 05 Apr 2012, 10:20

Maybe not under board, but I think that trannie just covers it.

beedotman · Post by **beedotman** » 05 Apr 2012, 10:23

sinner wrote:Even if so, and there is something under the board Filter still have no sense to me. It wont mix in anything as is. It looks more like taking cap to ground.

I need to keep tantric practice more often

No - on board there's no output cap, so I think F.A.C is output cap switch.
Pink wire from Level pot lug 2 goes to F.A.C common lug.

sinner · Post by **sinner** » 05 Apr 2012, 10:24

beedotman wrote:Maybe not under board, but I think that trannie just covers it.

I'm talking about the fuzz bro, there will be time for the boobster

BTW, I'm sure Dave Main is chocking right now laughing at me how I'm breaking my penis on this. Well done Mr.Main, well done

sinner · Post by **sinner** » 05 Apr 2012, 10:25

beedotman wrote:
sinner wrote:Even if so, and there is something under the board Filter still have no sense to me. It wont mix in anything as is. It looks more like taking cap to ground.

I need to keep tantric practice more often
No - on board there's no output cap, so I think F.A.C is output cap switch.
Pink wire from Level pot lug 2 goes to F.A.C common lug.

So we have to many caps then.

I'll leave it for now, do other shit, and I'll back on it tonite

beedotman · Post by **beedotman** » 05 Apr 2012, 10:27

sinner wrote:
beedotman wrote:Maybe not under board, but I think that trannie just covers it.

I'm talking about the fuzz bro, there will be time for the boobster

Oh... OK

sinner wrote:BTW, I'm sure Dave Main is chocking right now laughing at me how I'm breaking my penis on this. Well done Mr.Main, well done

mmolteratx · Post by **mmolteratx** » 29 May 2012, 04:30

I've been looking at this for the last hour and there just has to be something underneath the board. Otherwise it makes no sense at all. That 10nF cap in the middle of the board just throws everything off. If we assume that there's no jumpers, the bottom end can only connect to the base of Q1 or nothing. Neither makes any sense at all unless he's using feedback off the collector of Q2 and 3, which are connected if we assume there are no trace cuts there and both are connected to V- by a 15k resistor and there's the cap off the collectors back to the base of Q3. Q1 is the same input stage as a Zonk/TB MKI otherwise. The "gain" control is the same as well. It's there that things start to get goofy if you want to keep it a MKI/Zonk Variant.

phibes · Post by **phibes** » 29 May 2012, 05:10

It's hard to really say with just the one photo really. There's probably a jumper though.

mmolteratx · Post by **mmolteratx** » 29 May 2012, 05:53

Actually, move the collector of Q2 down one row and the bottom lug of the leftmost 100n cap down one row and it makes perfect sense. Other than the input cap values, IMO.

EDIT: Also, put a trace cut where the collector of Q2 currently is.

sinner · Post by **sinner** » 29 May 2012, 06:15

This is what I was thinking, top component side is not all it is there for sure. I would love to give away mu .diy file for your needs, but I'm going away in a minut, and I'll back day after tomorrow (if I'm lucky)

sinner · Post by **sinner** » 31 May 2012, 04:44

here's 676fuzz DIYLCv3 project file - not finished