Author Topic: Anyone build the Jen Fuzz III as per the Dragonfly Vero Layouts?  (Read 4436 times)

superferrite

I found a chunk of vero just big enough for this puppy, and there is scant info on it and no youtubes.  Looks like a silicon tonebender with some clipping diodes.  That sounds like a LOT of fun!

Now THAT"S Italian!
Anyone do this one?  It looks like it might be a sweet mod platform.  A nice input cap blend, maybe put those diodes on a pot, etc...

http://www.aronnelson.com/gallery/main.php/v/DRAGONFLY-LAYOUTS_0/album18/album144/JEN_FUZZ_III_VERO_001.gif.html

http://www.aronnelson.com/gallery/main.php/v/DRAGONFLY-LAYOUTS_0/album146/FUZZ/JEN+FUZZ+GUTS.JPG.html
Psychedelic Garage Metal

superferrite

Re: Anyone build the Jen Fuzz III as per the Dragonfly Vero Layouts?
« Reply #1 on: June 09, 2012, 03:15:54 AM »
Awww, MAN!  Nobody, huh?
Psychedelic Garage Metal

LucifersTrip

Re: Anyone build the Jen Fuzz III as per the Dragonfly Vero Layouts?
« Reply #2 on: June 09, 2012, 03:55:26 AM »
I usually build the first versions, so I built the "Jen Fuzz"



which is very similar to the "III".  It's actually closer to a Fuzz Face with an emitter follower up front and some clipping diodes.  It's a killer, loud, trebly fuzz with very good sustain. I don't think I modded anything...

I asked 2 times on this forum for ballpark voltages or even guesses for this or a similar circuit, and noone gave anything.

I can only give you a few tips. One, don't worry about the "odd" voltages for Q1. I still don't know if it's typical for an emitter follower/buffer, but I got this for e/b/c:
Q1 > 5.96, 6.12, 9.04

Two, don't use high gain transistors. I found that's probably the #1 biggest error when building vintage fuzzes. I blindly used 2N5088's as called for in the schematic, but wound up with ones with much lower gains (~200), which sounded far better.

Three, changing the diodes didn't have too much effect...though, I can't remember if I tried germanium.

In the end I got close to what jmusser described:
http://www.diystompboxes.com/smfforum/index.php?topic=43036.0

good luck

always think outside the box

joegagan

Re: Anyone build the Jen Fuzz III as per the Dragonfly Vero Layouts?
« Reply #3 on: June 09, 2012, 04:08:56 AM »
andrew's build lists a 220 instead of the 22 ohm on above schem. the 220 ohm makes a lot more sense to me.
interesting circ, regardless.  i always like to see early use of diodes to ground.

my life is a tribute to the the great men and women who held this country together when the world was in trouble. my debt cannot be repaid, but i will do my best. - Q

joegagan

Re: Anyone build the Jen Fuzz III as per the Dragonfly Vero Layouts?
« Reply #4 on: June 09, 2012, 04:14:37 AM »
based on past experience and j musser's build notes, i would try to make the thing more gnarlee by reducing the feedback 150k to 68k or so, and increasing cap size at input and between Q1 and Q2. possibly a larger cap to ground in place of the 22u. instead of a fuzzpot, possibly a pot between the diodes and ground would add to the versatility.
my life is a tribute to the the great men and women who held this country together when the world was in trouble. my debt cannot be repaid, but i will do my best. - Q

superferrite

Re: Anyone build the Jen Fuzz III as per the Dragonfly Vero Layouts?
« Reply #5 on: June 09, 2012, 11:46:15 AM »
Thanks guys!
Good suggestions, all.

John Lyons traded me for some transistors and now I have lots of low-gain silicon transistors for just such a project.  They're the key to lots of old tones, and you don't have all this piggyback BS to deal with!
Psychedelic Garage Metal

LucifersTrip

Re: Anyone build the Jen Fuzz III as per the Dragonfly Vero Layouts?
« Reply #6 on: June 10, 2012, 02:36:06 AM »

John Lyons traded me for some transistors and now I have lots of low-gain silicon transistors for just such a project.  They're the key to lots of old tones, and you don't have all this piggyback BS to deal with!

you don't need low gains ones for these...just ones around 200 for Q1/Q2
http://transistor-spravochnik.ru/description/bc238b/23994

I should've noted that Q3 could be higher gain
http://transistor-spravochnik.ru/description/bc238c/23997

Just check your voltages...I got the best sound in the typical 4-5v range for Q3C
always think outside the box

superferrite

Re: Anyone build the Jen Fuzz III as per the Dragonfly Vero Layouts?
« Reply #7 on: June 10, 2012, 12:08:16 PM »
Spaseeba, tovarishch!
Psychedelic Garage Metal

kaycee

Re: Anyone build the Jen Fuzz III as per the Dragonfly Vero Layouts?
« Reply #8 on: June 10, 2012, 02:57:21 PM »
Built the 1st one, I think I used 2N3904's or maybe BC108's. Its loud, quite trebley with lots of sustain as noted- myself, I didn't like it much, found it harsh and unmusical and ebayed it on - its painted all black and stamped 'Stealth Fuzz' if anyone ever comes across it :icon_lol:

superferrite

Re: Anyone build the Jen Fuzz III as per the Dragonfly Vero Layouts?
« Reply #9 on: June 10, 2012, 06:11:13 PM »
I'll probably build it tomorrow or the next day.  I could always throw on a SWTC for a little bassiness.
Question:  Did the fuzz pot do anything, or was it just for show like a Shin-ei FY2?

Psychedelic Garage Metal

LucifersTrip

Re: Anyone build the Jen Fuzz III as per the Dragonfly Vero Layouts?
« Reply #10 on: June 10, 2012, 10:42:17 PM »
I'll probably build it tomorrow or the next day.  I could always throw on a SWTC for a little bassiness.
Question:  Did the fuzz pot do anything,

the attack is the same as on a Fuzz Face...and fully works

Quote
or was it just for show like a Shin-ei FY2?

??? not sure what you mean...the Fuzz pot in definitely not for show on both the silicon & germanium versions...


always think outside the box

superferrite

Re: Anyone build the Jen Fuzz III as per the Dragonfly Vero Layouts?
« Reply #11 on: June 10, 2012, 11:33:07 PM »
Hmm, my FY2 does "really fuzzy" to "REALLY,REALLY fuzzy" 
Not a bad thing, just an observation.
Psychedelic Garage Metal

DougH

Re: Anyone build the Jen Fuzz III as per the Dragonfly Vero Layouts?
« Reply #12 on: June 11, 2012, 09:17:28 AM »
I usually build the first versions, so I built the "Jen Fuzz"



which is very similar to the "III".  It's actually closer to a Fuzz Face with an emitter follower up front and some clipping diodes.  It's a killer, loud, trebly fuzz with very good sustain. I don't think I modded anything...

I asked 2 times on this forum for ballpark voltages or even guesses for this or a similar circuit, and noone gave anything.

I can only give you a few tips. One, don't worry about the "odd" voltages for Q1. I still don't know if it's typical for an emitter follower/buffer, but I got this for e/b/c:
Q1 > 5.96, 6.12, 9.04

Two, don't use high gain transistors. I found that's probably the #1 biggest error when building vintage fuzzes. I blindly used 2N5088's as called for in the schematic, but wound up with ones with much lower gains (~200), which sounded far better.

Three, changing the diodes didn't have too much effect...though, I can't remember if I tried germanium.

In the end I got close to what jmusser described:
http://www.diystompboxes.com/smfforum/index.php?topic=43036.0

good luck



The emitter follower voltages look pretty reasonable. Ve "follows" Vb and is roughly half of the supply voltage. Guitar pickup signal is a few hundred millivolts to a volt so the bias is not crucial.

Metal can 2n2222's sound good for vintage fuzzes. They have low hfe.
« Last Edit: June 11, 2012, 09:19:00 AM by DougH »
"I can explain it to you, but I can't understand it for you."

LucifersTrip

Re: Anyone build the Jen Fuzz III as per the Dragonfly Vero Layouts?
« Reply #13 on: June 11, 2012, 03:00:49 PM »

 I still don't know if it's typical for an emitter follower/buffer, but I got this for e/b/c:
Q1 > 5.96, 6.12, 9.04



The emitter follower voltages look pretty reasonable. Ve "follows" Vb and is roughly half of the supply voltage. Guitar pickup signal is a few hundred millivolts to a volt so the bias is not crucial.


at the time, what I thought was "odd" was that the voltages of the emitter and base were so close. I tried various gain transistors in that Q1 slot and the overall sound did change (not drastically)...and of course, the emitter & base voltages shifted up or down together, reamining almost the same as before.

« Last Edit: June 11, 2012, 06:12:27 PM by LucifersTrip »
always think outside the box