Jen Double Sound Super Wah-Fuzz Added to DIYG

[Paul Marossy]

Here's the link to what started it all:
http://diyguitarist.com/phpbb/viewtopic.php?p=3077#3077

PCB and Component Layout:
http://www.diyguitarist.com/PDF_Files/JenDoubleSoundV4.pdf

Repro Bottom Plate:
http://www.diyguitarist.com/PDF_Files/JenDoubleSoundBP.pdf

One person has said that this pedal pretty much nails the Hendrix tone. Just thought I'd share it in case anyone was interested in it. 

[KerryF]

Hmm looks awsome man.  Good job .

[Paul Marossy]

Thanks. I guess I'll have to make a page on it at some point.

[Paul Marossy]

Here's the schematic: http://www.diyguitarist.com/PDF_Files/JDSS-Schem.pdf

[KerryF]

Thanks.  Hows the wah on this?  Good?  Sound like a Crybaby, a Vox, something else?  I want to build a wah, but finding the enclosure is the hard part.

[$uperpuma]

NICE.  Its such a cool sound... and the project looks fun... Thank you for the work you did to make it available to everyone!

[Paul Marossy]

Thanks.  Hows the wah on this?  Good?  Sound like a Crybaby, a Vox, something else?  I want to build a wah, but finding the enclosure is the hard part.

Now, keep in mind that wah tone is a highly subjectuve matter, but the person that gave me the info to create the layout says that the wah section blows his Dunlop Crybaby and Vox V847 out of the water. It's just your basic CryBaby circuit, though. Maybe he got one where everything came together in a good way. 

NICE.  Its such a cool sound... and the project looks fun... Thank you for the work you did to make it available to everyone!

You're welcome. I think I'm going to build it sometime, just because. 

[puretube]

Looking at the schemo,
I missed a feedback-resistor
in the FUZZ-circuit where I
would expect one to be there
from 2nd transistor-emitter
to 1st transistor base.

Saw a series-input-resistor 68k however,
to the 1st transistor base...

In the PCB I don`t find latter,
see a feedback 68k, however,
like expected in the schemo?

What to trust blindly?

[Mark Hammer]

I sorta thought there was a missing resistor in there too, that would make the design more closely resemble a typical Fuzz Face topography.  Being largely naive in the ways of transistors, though, I was reluctant to declare the schem wrong or incomplete.  But yeah, I had the feeling like when you walk into a room and you know something's missing but you can't quite put your finger on it.

[Paul Marossy]

The schematic could have an error on it, I'm not that good at as-builting things, so it's quite possible. You could compare the PCB layout (which has been verified to be the same as the original): http://www.diyguitarist.com/PDF_Files/JenDoubleSoundV4.pdf

[Thomas P.]

maybe I'm just tired but I don't get the switching. To me it appears as it would be possible to connect the wha output to the input.

Regards,
tomboy

[Paul Marossy]

maybe I'm just tired but I don't get the switching. To me it appears as it would be possible to connect the wha output to the input.

Yeah, the switching is a little confusing. That's how it is according to the guy I have been working with who has an actual one in his possession. I don't have one to double check that.

I think I also had a mistake on my schematic regarding the fuzz section. I think that the 68K resistor is connected between the base of the first transistor and the emitter of the second transistor. That would make it more like the Fuzz Face circuit. Once again, however, I have to take his word for the transistor pinouts - he seemed pretty sure about the pinouts, though. At first I thought this was a carbon copy of the Dallas Arbiter Fuzz Wah, but it's different. Anyhow, here is a more formal revised schematic: http://www.diyguitarist.com/PDF_Files/JSDS-SchemV1.pdf

[Dan N]

Looks like that 68K is the culprit. Run the cap straight into the Q1 base, and hook that sucker from the base to the Q2 emitter.

Thanks Paul!

[jonathan perez]

YESSSS!!!!!!

[jonathan perez]

Marossy, you are the man! 

[Paul Marossy]

Marossy, you are the man!

He he. I thought a few people here would appreciate this one. 

[Paul Marossy]

I etched and populated the PCB last night. By this weekend sometime I should have a progess report. 

[Paul Marossy]

OK, here's an update:

I wired it up last night. It does certainly sound kind of like Jimi. The wah section is kind of messed up, though. When it's in wah/bypass mode, there is practically no signal. I've been looking at the DPST switch and the wires going to it from the DPDT switch. I don't think that is really how it's wired - "B" can be connected directly to the wah output, and the signal seems to get canceled out. It seems to me that the only way that it can be wired correctly is to replace the DPST switch with a DPDT switch. I'm going to make this change later when I get home from work. I think that should do it....

[Paul Marossy]

Here's a couple of pictures. It just barely fits in the CryBaby shell.




I've rewired the switch, I'm going to test it out in a little while. 

[Paul Marossy]

OK, the layout works as is. What I did is wire the DPST wrong. It was turned 90 degrees, so that in A+B or bypass mode the wah out never made contact with the output jack.

So now that that is fixed, the first thing that I have noticed with this circuit is that it sucks tone pretty bad. I wonder if there is a way to true bypass it? It really needs it since there is wah and a fuzz always connected to the input jack.