Mad Professor - Stone Grey Distortion  [traced]

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Mad Professor - Stone Grey Distortion

Postby roseblood11 » 07 Jun 2011, 10:20

A friend gave me one of these pedals today. First glance: Based on CD4049ube, two 2n3819 Jfet's, one opamp. I´ll retrace it next weekend, I guess it will be easy as most traces are visible.
Sound is good, but not overwhelming...

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Re: Mad Professor Stone Grey Distortion

Postby roseblood11 » 07 Jun 2011, 11:39

ups... typo: itś a CD4069ube
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Re: Mad Professor Stone Grey Distortion

Postby roseblood11 » 07 Jun 2011, 14:18

Parts values:

r1: 4,7k
r2: 14,7k
r3: 470k
r4: 470k
r5: 200k
r6: 1m
r7: 1m
r8: 1m
r9: 1m
r10: 1k
r11: 100R carbon
r12: 10k

c1: 47n
c2: 47nF
c3: 100pF ceramic
c4: 100pF
c5: 100pF
c6: 15pF
c7: 2,2nF
c8: 100nF
c9: 10nF
c10: 100µF
c11: 4,7µF
c12: 22nF

d1: Zener, maybe 5,1V
d2: 1n4007

u1: tl051
u2: cd4069ube

t1: 2n3819
t2: 2n3819

p1 (distortion): 1m log (measures almost 1,2m), ("10A1M")
p2 (tone): 50k log
p3 (volume): 50k log

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Re: Mad Professor Stone Grey Distortion

Postby ShortScaleMike » 07 Jun 2011, 15:57

Excited about this one!
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Re: Mad Professor Stone Grey Distortion

Postby Sikor » 08 Jun 2011, 13:29

I've played one yesterday :)
I like it a lot, but it was very bright.
While playing through bright clean channel I had to turne Tone knob at least down to 9 o'clock.
Untill 3 o'clock at the Gain knob it was becomming more gainy, but still dynamic.
Turning gain more didn't really brought new gain, but mostly compression.
SGD has definitely my interest :)
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Re: Mad Professor Stone Grey Distortion

Postby roseblood11 » 08 Jun 2011, 23:20

Done!

I´ll have to redraw the schematic before I can post it. Veroboard layout is finished as well, I´ll build it on friday to verify the schematic.

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Re: Mad Professor Stone Grey Distortion

Postby Lawnchair » 09 Jun 2011, 02:56

Irons hot.
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Re: Mad Professor Stone Grey Distortion

Postby ShortScaleMike » 09 Jun 2011, 12:12

Fast work! I was going to offer to do a vero layout but it seems you've got it all under control - nice work.
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Re: Mad Professor Stone Grey Distortion

Postby roseblood11 » 10 Jun 2011, 01:41

pictures:
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Re: Mad Professor Stone Grey Distortion  [traced]

Postby roseblood11 » 10 Jun 2011, 01:42

schematic and veroboard layout.

UNVERIFIED!
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Re: Mad Professor Stone Grey Distortion

Postby WhiteKeyHole » 10 Jun 2011, 17:18

I wonder by how much, if at all, the Bearfoot Model H differs.
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Re: Mad Professor Stone Grey Distortion

Postby roseblood11 » 11 Jun 2011, 00:13

Schematic and veroboard layout are VERIFIED!

I used a 1n5817 schottky for D2 (because of the lower voltage drop) and a OPA134 instead of the TL051. There´s only a subtile difference in sound compared to the original pedal, but I definitely prefer the clone.

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Re: Mad Professor Stone Grey Distortion

Postby muhd85 » 11 Jun 2011, 17:20

Hi! just to report that i've build that layout and i would say that it sounds marvelous! just like the video. but i used tl071 instead of tl051.. i like this much better than bjf DRD.. its worth it! :D

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Re: Mad Professor Stone Grey Distortion

Postby DimebuGG » 12 Jun 2011, 03:06

PCB...
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Re: Mad Professor Stone Grey Distortion

Postby roseblood11 » 12 Jun 2011, 15:04

This is my pedal... I only had that big mojo carbon comp resistor for the 100R. It looks good, but it doesn´t fit into the enclosure... :slap:
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Re: Mad Professor Stone Grey Distortion

Postby euronymous0001 » 12 Jun 2011, 15:19

roseblood11 did you try to sub the fet with other types (e.g. J201, 2N5457 and/or MPF102 )
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Re: Mad Professor Stone Grey Distortion

Postby roseblood11 » 12 Jun 2011, 15:26

They are just uses as clipping diodes. You can sub them with whatever you want.
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Re: Mad Professor Stone Grey Distortion

Postby chriscustom » 12 Jun 2011, 15:39

euronymous0001 wrote:roseblood11 did you try to sub the fet with other types (e.g. J201, 2N5457 and/or MPF102 )



good result also with the type of BF245A
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Re: Mad Professor Stone Grey Distortion

Postby chriscustom » 12 Jun 2011, 17:35

DimebuGG wrote:PCB...


R4=470k.
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Re: Mad Professor Stone Grey Distortion

Postby Kaos » 29 Jun 2011, 14:39

Oh yeah!

You guys are my personal heroes of the day!
I just saw a demo(http://www.youtube.com/watch?v=eex8xpJ6OD0&feature=feedu) of the pedal and instantly wanted it. That'll beef up my Fender Supersonic.

Cheers
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