Dunlop - JHF3 Band of Gypsys Fuzz Face  [traced]

General documentation, gut shot, schematic links, ongoing circuit tracing, deep thoughts ... all about boutique stompboxes.
User avatar
FuzzMonkey
Breadboard Brother
Information
Posts: 124
Joined: 28 Dec 2009, 22:10
Has thanked: 44 times
Been thanked: 27 times

Post by FuzzMonkey »

Image

One assumes its the same circuit as its little brother.

User avatar
The Rotagilla
Diode Debunker
Information
Posts: 744
Joined: 20 Aug 2007, 18:24
Has thanked: 7 times
Been thanked: 61 times

Post by The Rotagilla »

I thought I had read that it's the fuzz side of an Octavia pedal.
The television will not be revolutionized.

User avatar
FuzzMonkey
Breadboard Brother
Information
Posts: 124
Joined: 28 Dec 2009, 22:10
Has thanked: 44 times
Been thanked: 27 times

Post by FuzzMonkey »

So it seems.

User avatar
FuzzMonkey
Breadboard Brother
Information
Posts: 124
Joined: 28 Dec 2009, 22:10
Has thanked: 44 times
Been thanked: 27 times

Post by FuzzMonkey »

Some more images:

Image

Image

Image

User avatar
FuzzMonkey
Breadboard Brother
Information
Posts: 124
Joined: 28 Dec 2009, 22:10
Has thanked: 44 times
Been thanked: 27 times

Post by FuzzMonkey »

A few other images:

Image

Image

Image

User avatar
FausterCraster
Information
Posts: 34
Joined: 27 Sep 2016, 05:52
Has thanked: 17 times
Been thanked: 18 times

Post by FausterCraster »

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

User avatar
mirosol
Resistor Ronker
Information
Posts: 292
Joined: 11 Mar 2012, 16:15
my favorite amplifier: Been on Bogner for quite some time now.
Completed builds: Over 1000 and counting.
Location: TKU, FI
Has thanked: 192 times
Been thanked: 449 times

Post by mirosol »

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.
http://tagboardeffects.blogspot.com/
http://mirosol.kapsi.fi/
"No such thing as innocence" -Iron Chic

User avatar
FausterCraster
Information
Posts: 34
Joined: 27 Sep 2016, 05:52
Has thanked: 17 times
Been thanked: 18 times

Post by FausterCraster »

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) ?

TX

User avatar
mirosol
Resistor Ronker
Information
Posts: 292
Joined: 11 Mar 2012, 16:15
my favorite amplifier: Been on Bogner for quite some time now.
Completed builds: Over 1000 and counting.
Location: TKU, FI
Has thanked: 192 times
Been thanked: 449 times

Post by mirosol »

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.
http://tagboardeffects.blogspot.com/
http://mirosol.kapsi.fi/
"No such thing as innocence" -Iron Chic

User avatar
EmmG
Breadboard Brother
Information
Posts: 76
Joined: 11 Nov 2012, 02:03
Has thanked: 18 times
Been thanked: 46 times

Post by EmmG »

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

User avatar
mirosol
Resistor Ronker
Information
Posts: 292
Joined: 11 Mar 2012, 16:15
my favorite amplifier: Been on Bogner for quite some time now.
Completed builds: Over 1000 and counting.
Location: TKU, FI
Has thanked: 192 times
Been thanked: 449 times

Post by mirosol »

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.
http://tagboardeffects.blogspot.com/
http://mirosol.kapsi.fi/
"No such thing as innocence" -Iron Chic

User avatar
ThiagoFaraday
Information
Posts: 41
Joined: 18 Nov 2016, 11:34
my favorite amplifier: JTM45
Location: Brazil
Has thanked: 49 times
Been thanked: 22 times

Post by ThiagoFaraday »

R13 120E
Attachments
Sem título.jpg

User avatar
tube-exorcist
Resistor Ronker
Information
Posts: 445
Joined: 05 Jul 2007, 20:09
Has thanked: 173 times
Been thanked: 67 times

Post by tube-exorcist »

ThiagoFaraday wrote:R13 120E
R13 = 10k
"I've noticed there's an inverse relationship between cost of gear and talent. If you need the most expensive gear to get decent tones, then you suck as a player."

User avatar
FausterCraster
Information
Posts: 34
Joined: 27 Sep 2016, 05:52
Has thanked: 17 times
Been thanked: 18 times

Post by FausterCraster »

R13 ??
what is wrong in 220E ?
Attachments
R13.jpg
R13.jpg (20.67 KiB) Viewed 5895 times

User avatar
FausterCraster
Information
Posts: 34
Joined: 27 Sep 2016, 05:52
Has thanked: 17 times
Been thanked: 18 times

Post by FausterCraster »

It's verified.
Nice fuzz.
Attachments
Board.jpg

User avatar
Manfred
Tube Twister
Information
Posts: 1937
Joined: 04 Apr 2009, 23:42
Has thanked: 1671 times
Been thanked: 1344 times

Post by Manfred »

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.

User avatar
swt
Breadboard Brother
Information
Posts: 112
Joined: 07 Sep 2007, 16:52
Has thanked: 7 times
Been thanked: 13 times

Post by swt »

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.

User avatar
crazyhendrix
Information
Posts: 3
Joined: 24 Jun 2017, 12:54
Been thanked: 2 times

Post by crazyhendrix »

FausterCraster wrote:It's verified.
Nice fuzz.
This works? Any suggestions?

User avatar
EmmG
Breadboard Brother
Information
Posts: 76
Joined: 11 Nov 2012, 02:03
Has thanked: 18 times
Been thanked: 46 times

Post by EmmG »

I built one using Storyboardist's layout:
https://effectslayouts.blogspot.com/201 ... -face.html
Image

It's very high gain with overwhelming "bloom" type fuzz and strong sustain. The gain knob is useful all the way and very interactive with the guitar's volume control - like a good fuzz.

Thread for the "mini" version:
viewtopic.php?f=7&t=25252

Telecaster forum thread pointing to this one and with accurate reviews:
http://www.tdpri.com/threads/npd-band-o ... ce.584287/

There's a newer Dunlop "Gypsy Fuzz" in a 1590B with a tone control.

User avatar
bc108
Breadboard Brother
Information
Posts: 74
Joined: 04 May 2017, 15:39
my favorite amplifier: BE100
Has thanked: 34 times
Been thanked: 5 times

Post by bc108 »

Any confirmation about Q2 and Q3?
I've read that they're MPSA3904's there

Post Reply