axial fuzz - schematic and verified vero

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Nocentelli
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Post by Nocentelli »

I recently made this silicon tonebender mkII-type fuzz:
Axial fuzz schem_nocentelli.bmp
Axial fuzz schem_nocentelli.bmp (395.04 KiB) Viewed 2928 times
It has a big muff sustain control between Q1 and 2/3 instead of using a pot on the Q3 emitter to control gain. Q1 is a simple boost stage with bias resistor values pretty much lifted from the wampler velvet fuzz, but minus the emitter resistor bypass cap for less woolly low end boost. Q2+3 are essentially the fuzzface-like portion of the Skreddy lunar module fuzz running at full tilt: This section has to be my favourite "fuzz circuit block" of all fuzzes I've breadboarded or built so far. It biases up perfectly with pretty much any si bjt I've tried, giving a long, smooth sustain with little or no gating to pinch off the tail of the note at low or higher gain levels.

Just finished up building it and it fired up first time using this layout:
axial fuzz_vero_nocentelli_.gif
The BMP sustain control means some low end drops out as the sustain is wound right back, making it less fuzzy and more overdrive-y.
modman wrote: Let's hope it's not a hit, because soldering up the same pedal everyday, is a sad life. It's that same ole devilish double bind again...

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~arph
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Post by ~arph »

I was planning on building mictesters hot silicon ( :lol: ) but I think I'm boldy going for this one. I have no BCXXX transistors so I'm going to experiment with my low gain silicon metal can collection. ( I love the 2N3440 ). Let's see how forgiving the biasing is :horsey:
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Nocentelli
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Post by Nocentelli »

It's fine with metal can 2N2222s, if they're similar
modman wrote: Let's hope it's not a hit, because soldering up the same pedal everyday, is a sad life. It's that same ole devilish double bind again...

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Post by Nocentelli »

I've just googled 2n3440.... It suggests hfe 40-160.... :shock:
...maybe they'll work.
modman wrote: Let's hope it's not a hit, because soldering up the same pedal everyday, is a sad life. It's that same ole devilish double bind again...

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~arph
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Post by ~arph »

They work fine, I've tried a whole bunch of transistors they all sound pretty similar. Somehow my output volume is not so high but the sound is right so I must have goofed up somewhere on the temp pot connections. It is incredibly bass heavy though. Is that meant to be, of is there something else wrong? ( I can always lower the input cap I have it at 330n now, the rest is as per schematic). Sustain pot works good. Shouldn't the filter pot be more like 10k? Anyway, it sound promising!
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Post by Nocentelli »

I'm glad it's worked for someone else. Mine doesn't sound particularly bass heavy, or particularly quiet, though: It might be worth checking over again. The filter is lifted straight from the Rat/Lunar module, and sounds about right at noon to me. However, as always it's down to personal taste and the guitar+amp used of course, so tinker away!
modman wrote: Let's hope it's not a hit, because soldering up the same pedal everyday, is a sad life. It's that same ole devilish double bind again...

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Post by ~arph »

I'm going to check my connections and values. It made my tele bridge PU sound like a humbucker neck PU. Might replace the filter with a SWTC. as it gives some more flexibility. I don't think it's the filter. With the pot at 50k it cuts at around 960Hz, so that is still pretty high.
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Post by ~arph »

Yup, connecting traces. It's loud as hell now :)
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Post by storyboardist »

Gonna give this a go this evening. Here's a perf and PCB layout I drew up. I added a polarity protection diode and reduced the power filter cap to 47µ (just because I have a ton of them and it was smaller than a 220µ). Unverified as of yet, but should be right.

Image

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Post by Nocentelli »

Wow, tidy layouts! Thanks for this.
modman wrote: Let's hope it's not a hit, because soldering up the same pedal everyday, is a sad life. It's that same ole devilish double bind again...

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Post by allesz »

I really like this project, recently I would like to build a "splitted" tonebender: a booster (that can be used by himself) and a low gain fuzz (that can be used by himself too) that, joined, will give tonebenderish sounds.

The output section reminds me of a rat... I like it too.

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Post by allesz »

I am experimenting this circuit on the breadboard at the moment; of course I think I will make some mods, but the basic sound is really good; what I really like is the sound of the fuzz face part and, in particular, the effect of that 100K from collector to base of Q1 (well, Q2 actually): wile experimenting I removed it and.... it went back in a second! The sound gets way bigger and bold wile, without, the sound it's thinner. Then you add Q1 in front of it and... whoa 8) The tone control really gives a nice final touch.
Bravo.

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V1nce69
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Pcb builds:
Fulltone 69 (GGG kit)
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Clone Theory Chorus (Celeste pcb from lectric-fx)
Cornish G2 (home etch, layout thx FSB)
Shin-Ei FY-2 Ge version (home etched, own layout)
Klon (Aion Refractor pcb)
Mutron Phasor II (home etched, layout thx JohnK)
Sunny-T (pcb by guitar pcb)
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Post by V1nce69 »

[quote="Nocentelli"]I recently made this silicon tonebender mkII-type fuzz:
The attachment Axial fuzz schem_nocentelli.bmp is no longer available
Just built this one on perfboard and it works very fine, even on bass. Thanks ! :applause:

I just replaced the two 220n caps around the sustain pot with 330n, and used a 1µF film as input cap. All other values are as per the schematic.
There's just a 2k2 resistor added for the on/off led.

I used storyboardist's layout and slightly adapted it (swapped diode and 220µF cap).
Axial Fuzz.pdf
Axial Fuzz_perfboard layout
(38.3 KiB) Downloaded 128 times
Axial Fuzz_board
Axial Fuzz_board
Axial Fuzz_detail
Axial Fuzz_detail

User avatar
V1nce69
Information
Posts: 49
Joined: 10 Nov 2013, 08:01
my favorite amplifier: Ampeg
Completed builds: Veroboards builds:
Throbak Overdrive Boost
Wampler Ecstasy
Creepy Fingers Doomidrive
Black Arts Quantum Mystic
Roger Mayer Voodoo Bass
Idiot box Blowerbox
Hudson Sidecar

Pcb builds:
Fulltone 69 (GGG kit)
Russian Big Muff (Musikding kit)
EHX Bassballs (home etched using Topopiccione layout)
BJFE BBOD (home etched, thx FSB)
Triangle Muff (Guitar PCB board)
Deluxe Bass Fuzz (home etched,gausmarkov.net layout)
Clone Theory Chorus (Celeste pcb from lectric-fx)
Cornish G2 (home etch, layout thx FSB)
Shin-Ei FY-2 Ge version (home etched, own layout)
Klon (Aion Refractor pcb)
Mutron Phasor II (home etched, layout thx JohnK)
Sunny-T (pcb by guitar pcb)
Rocket Overdrive (pcb by Pepers' pedals)
Sonomatic Deluxe Tape Delay (pcb by Skidmark)
Black Arts Quantum Mystic (adapted storyboardist layout)
Location: Lausanne, Switzerland
Has thanked: 36 times
Been thanked: 110 times

Post by V1nce69 »

Box etched, painted and build completed !

It definitely sounds great on bass!

Gutshot
https://www.dropbox.com/s/n4i9xblz33h3z ... 8.jpg?dl=0

Front
https://www.dropbox.com/s/wahyui1a4poz6 ... 5.jpg?dl=0

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