Boot-Leg Effectors - Jazz Fuzz JZF-1.0

picassochild · Post by **picassochild** » 13 Apr 2009, 20:25

Hey guys, check pics of Boot-Leg Jazz Fuzz guts. Here's some info from japanese site

http://translate.google.com/translate?p ... ry_state0=

Gila_Crisis · Post by **Gila_Crisis** » 13 Apr 2009, 21:12

here you go, maybe when i've more time i'll draw a schem

Gila_Crisis · Post by **Gila_Crisis** » 13 Apr 2009, 21:28

ok... i was so much in this thing that i've draw a first schem... the first part untill the 2k2 after the opamp is ok to me, but the volume and vintage pots section is looking really strange

have I done something wrong???

culturejam · Post by **culturejam** » 13 Apr 2009, 22:44

Gila_Crisis wrote:ok... i was so much in this thing that i've draw a first schem... the first part untill the 2k2 after the opamp is ok to me, but the volume and vintage pots section is looking really strange
have I done something wrong???

The only thing I don't like the looks of is that the entire signal path is grounded just after the 2K2.

That, and it looks like there is a 900M resistor right before the "vintage" pot.

Gila_Crisis · Post by **Gila_Crisis** » 14 Apr 2009, 05:18

well i took a look at the pics on the japanese website and now i corrected the pads.

well, i agree that it's not possibile that the signal is grounded like this... i checked again the pcb and now it look like this:

but i still have those crazy groundings (marked in red) ....

kusi · Post by **kusi** » 14 Apr 2009, 08:35

vintage-contol should work like this;

Gila_Crisis · Post by **Gila_Crisis** » 14 Apr 2009, 08:50

ops.... thank you so much Kusi! ^_^

this explain something i was wondering when i managed to understand what are the pads for the wires, and how the 2DPT footswitch wiring is.
this fuzz is not true bypass, but it seams that when in bypass the opamp out (pin6) after the 2k2 is grounded.

then i'm gonna draw a new better schem for this one

Gila_Crisis · Post by **Gila_Crisis** » 14 Apr 2009, 12:19

so here you go with the schem

enjoy it

culturejam · Post by **culturejam** » 14 Apr 2009, 14:31

Nice work, Gila.

SPeter · Post by **SPeter** » 14 Apr 2009, 14:50

Gila_Crisis wrote:so here you go with the schem

enjoy it

IMO when the circuit is in the bypass mode and the Volume pot rotated fully clockwise the output will be shorted to ground by the switch !I do not think it has to be like that? Input can be shorted but the output?

Cheers!

~arph · Post by **~arph** » 14 Apr 2009, 14:51

That bypass switching can't be correct.. if when on the volume is at full, then it is dead silent in bypass..

EDIT: you beat me.

SPeter · Post by **SPeter** » 14 Apr 2009, 14:55

SPeter wrote:
Gila_Crisis wrote:so here you go with the schem

enjoy it
IMO when the circuit is in the bypass mode and the Volume pot rotated fully clockwise the output will be shorted to ground by the switch !I do not think it has to be like that? Input can be shorted but the output?

Cheers!

The same is true when the Volume pot is rotated fully anticlockwise!

Cheers!

Gila_Crisis · Post by **Gila_Crisis** » 14 Apr 2009, 15:05

i know this particular bypass switching is a bit strange. but is what i could tell by looking at the pictures found on effector-repair.com!

it would be fine if picassochild could send us some more pics of the wiring between swtich, pcb and jacks or at least check out if the schem is right

Naz Nomad · Post by **Naz Nomad** » 14 Apr 2009, 15:30

Using the photos ^^^ and Gila's schem, I though I better finally contribute to this forum.

... there may be something blindingly obvious that I missed, please critique.

Gila_Crisis · Post by **Gila_Crisis** » 14 Apr 2009, 17:24

Gila_Crisis wrote:i know this particular bypass switching is a bit strange. but is what i could tell by looking at the pictures found on effector-repair.com!

it would be fine if picassochild could send us some more pics of the wiring between swtich, pcb and jacks or at least check out if the schem is right

btw the schem seams now right, and for the bypass i think all ara gonna make it true-bypass, so what ever.

now the last point is to know what diodes are those, an idea is 1N400x, but also some schottky diodes look like this

audiohub · Post by **audiohub** » 14 Apr 2009, 18:02

In the posted schematic, it looks like the values for the vintage and volume pots are reversed.

Gila_Crisis · Post by **Gila_Crisis** » 14 Apr 2009, 18:15

ops you're right

Gila_Crisis · Post by **Gila_Crisis** » 15 Apr 2009, 13:31

so i took again a look at the pics from effector repair and with the jaw breaker schem from soulsonic i corrected the bypass switch.
now the schem is 100% RIGHT

culturejam · Post by **culturejam** » 15 Apr 2009, 14:14

Hey Naz, can you double-check the final schematic to make sure it jibes with your layout and PCB transfer?

Thanks for that, by the way.

Naz Nomad · Post by **Naz Nomad** » 15 Apr 2009, 18:35

CJ, it certainly seems to be correct (possibly with the exception of the bypass switching - I just drove 700 miles and can't even see straight

) ... but hey, you know my old eyes

I did double-check my layout (a few times, so 6 checks??) last night, and I'm convinced that is true to the PCB shown on the Japanese site.

From the photos on the Japanese site, I managed to untangle their switching too ... can't edit my initial post, so here it is in its entirety.

Naz

Edit: ... just looked again after some caffeine, and yes, the schem is good to go.

And 'scaling' aside ...this might be a useful add-on if anyone needs it.

Boot-Leg Effectors - Jazz Fuzz JZF-1.0 [traced]