Dunlop - JHF3 Band of Gypsys Fuzz Face  [traced]

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Dunlop - JHF3 Band of Gypsys Fuzz Face

Postby FuzzMonkey » 06 Feb 2015, 03:55

Image

One assumes its the same circuit as its little brother.

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Re: Dunlop Band of Gypsys JHF3 Fuzz Face  [traced]

Postby The Rotagilla » 09 Feb 2015, 23:40

I thought I had read that it's the fuzz side of an Octavia pedal.
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Re: Dunlop Band of Gypsys JHF3 Fuzz Face

Postby FuzzMonkey » 10 Feb 2015, 10:34

So it seems.
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Re: Dunlop Band of Gypsys JHF3 Fuzz Face

Postby FuzzMonkey » 09 Mar 2015, 10:36

Some more images:

Image

Image

Image

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Re: Dunlop Band of Gypsys JHF3 Fuzz Face

Postby FuzzMonkey » 13 Aug 2015, 09:46

A few other images:

Image

Image

Image

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Re: Dunlop - JHF3 Band of Gypsys Fuzz Face

Postby FausterCraster » 18 Mar 2017, 21:27

Up.. I'm going to buil it.
Please note that looking to the board I noticed different values for R11 and R13

Anyone know what is the capacitor on C7 ?
What are NPN Transistor Q1 & Q2 ?

R1 680k
R2 820k
R3 180k
R4 220K
R5 1K
R6 220K
R7 470E
R8 47k
R9 100E
R10 1K
R11 470E (NO 560E)
R12 1K
R13 220E (NO 100E)

C1 22U
C2 CERAMIC MULTILAYER (150p maybe)
C3 100N
C4 100N
C5 22U
C6 22U
C7 POLARIZED ??
C8 4N7
C9 4N7
C10 1N

Q1 & Q2 ??
Q3 BC558

While R101, C101, C102, C103 are not present onto the board (as far as I see).

Double check is welcome.
TX
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Re: Dunlop - JHF3 Band of Gypsys Fuzz Face

Postby mirosol » 19 Mar 2017, 10:05

A few more shots would clear things up. However, i believe the R101, C101, C102 and C103 may be SMD parts under the board. This would be consistent with Dunlop build methods.
As for C7, my guess would be 1u axial tantalum. Again, the value isn't visible on the photos. C1 could also be 1n. This is based on the guess that all the rest of picofarad value caps may be SMD.

Maybe that's enough guesses? Breadboarding could help.

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Re: Dunlop - JHF3 Band of Gypsys Fuzz Face

Postby FausterCraster » 19 Mar 2017, 12:22

C1 can't be 1n.. maybe you meant C101.
All multilayer caps are yellow ones (clearly in the picture), so I suspect C101, C102, C103 are in pF.

BTW, what about NPN transistor (which one) ?

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Re: Dunlop - JHF3 Band of Gypsys Fuzz Face

Postby mirosol » 19 Mar 2017, 12:28

Ah! My bad. Typoed the designation. I meant C2. This would make sense as 1n since the 101 etc are most likely in picofarad range. Or it could possibly be 10n as well - as found in some tonebenders to tame the screeching highs from the input.

Again, guesses :) I haven't seen the original except for photos.
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Re: Dunlop - JHF3 Band of Gypsys Fuzz Face

Postby EmmG » 19 Mar 2017, 12:59

Here's another shot I found online. I looked up C7's label (1425) on the Kemet site and got this number back: T111B904K050AS. It's a 0.9uf.

Image

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Re: Dunlop - JHF3 Band of Gypsys Fuzz Face

Postby mirosol » 19 Mar 2017, 13:19

Nice! Still, for a build, the 1u will be close enough.

So what we're basically missing is the bottom images and a value for that MLCC. Transistor type is somewhat irrelevant as one could argue other being better than another for days.
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Re: Dunlop - JHF3 Band of Gypsys Fuzz Face

Postby ThiagoFaraday » 22 Mar 2017, 23:39

R13 120E
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Re: Dunlop - JHF3 Band of Gypsys Fuzz Face

Postby tube-exorcist » 23 Mar 2017, 12:51

ThiagoFaraday wrote:R13 120E


R13 = 10k
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Re: Dunlop - JHF3 Band of Gypsys Fuzz Face

Postby FausterCraster » 25 Mar 2017, 16:45

R13 ??
what is wrong in 220E ?
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Re: Dunlop - JHF3 Band of Gypsys Fuzz Face

Postby FausterCraster » 25 Mar 2017, 16:47

It's verified.
Nice fuzz.
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Re: Dunlop - JHF3 Band of Gypsys Fuzz Face

Postby Manfred » 25 Mar 2017, 18:03

FausterCraster wrote:R13 ??
what is wrong in 220E ?


I would rather say that that the ring colors are brown-black-black-red which determine the resistance value,
which would lead to a value of 10 Kiloohms.
The resistors R13 together with the capacitor C10 act as low-pass filter.
With a resistance of 220 Ohms gives a roll-off frequency of about 723 Kilohertz,
with 10 Kiloohms a roll-off frequency off about 16 Kilohertz.
This is why I believe that 10 Kiloohms are the right value,
because a low-pass filter with 723 Khz make no sense in this application but 16 Kilohertz is more likely.

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Re: Dunlop - JHF3 Band of Gypsys Fuzz Face

Postby swt » 21 Jun 2017, 14:00

do you guys know why they've chosen a 220k resistor inthe cathode follower stage?. it seems pretty high. the original had 22k in there.
i also think the last resistor is 10k. but it shouldn't be calculated as an isolated part...because it's part of a 2 pole low pass filter formed by r12,13 and c9,10.
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