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DIY Stompboxes => Building your own stompbox => Topic started by: WhiskeyMadeMeDoIt on July 18, 2014, 12:00:57 AM

Title: OMG Fuzz Version 1
Post by: WhiskeyMadeMeDoIt on July 18, 2014, 12:00:57 AM
I have had a few days of experimentation and breadboarding success.
After much part switching, jamming, whiskey, and good old fashion luck I present you with a new fuzz.
This fuzz has been tested by another member named CozyBuilder.
I was very fortunate that he was not only willing to try it but he offered feedback, suggestions, and a vero layout for this circuit.
The name "OMG Fuzz" is also from CozyBuilder! It stands for One Mighty Gnarly Fuzz.
This circuit is a way point for another design. It started with this and grew into something else which i will post as version 2.
It's a nice little fuzz and has some good sounds be sure to fire up a soldering iron and give it a whirl.
No demo yet for this one because its off the board for version 2.
The vero's haven't been verified yet but i will be building them and verifying soon unless someone beats me to it.
Be sure to look for the version 2. Coming soon...

The circuit:
(http://i.imgur.com/H9fObri.png)

The true bypass version:
(http://i.imgur.com/NsdHiip.png)

CozyBuilder sent me hand drawings of his layout so if there are mistakes it's probably mine when I converted it in DLC.
The millenium bypass version from CozyBuilder:
(http://i.imgur.com/fQn3Fly.png)


Title: Re: OMG Fuzz Version 1
Post by: Cozybuilder on July 31, 2014, 06:59:14 PM
Mine has a lot of bite to it, tons of sustain, a fun pedal! You can turn the gain down all the way and have a decent overdrive- this has an incredible amount of volume on tap. Unity is about 9:00, with the gain all the way down, about 7:30 with the gain pegged. Turn up the gain and its a whole new pedal.

In my build, the coupling caps between Q1-Q2 and Q2-Q3 are changed from 100nF to 10nF. You should play with these values to suit your taste, 22nF knocks off a lot of treble. This build uses standard 16mm Alpha pots, watt resistors, poly film caps, and has an additional 220pF filter cap paralleling the 100uF cap.

(http://i1362.photobucket.com/albums/r688/russrutledge/DSCN2014_zps62e18523.jpg)

(http://i1362.photobucket.com/albums/r688/russrutledge/DSCN2016_zps20fe94c4.jpg)
Title: Re: OMG Fuzz Version 1
Post by: Cozybuilder on August 05, 2014, 03:37:02 PM
I changed 2 of the coupling caps (from 10nF to 22nF and 33nF), the gain pot (from B100K), and am very happy with the sound now- meaty, gnarly, tons of sustain at max gain, great overdrive at minimum gain, completely usable pot travel. The volume is incredible, you definitely want to start at the low end of the scale.

(http://i1362.photobucket.com/albums/r688/russrutledge/c3743727-7d38-41d6-ad1b-64512ec200b5_zps4e08d968.jpg)
Title: Re: OMG Fuzz Version 1
Post by: Cozybuilder on August 28, 2014, 12:26:02 PM
Heres a VERO version of the OMG Fuzz, with switchable diode, and tone control. The range of sounds it covers is incredible, from ultra clean with the Germanium diode at minimum grit, to great 60's grinding fuzz tones, to metal with incredible sustain. The tone circuit is simple as could be, and surprisingly effective. This build uses standard 16mm pots, miniature SPDT switch, 1/4W metal film resistors, film box caps, 16V electrolytic cap, Millennium bypass switch. The board is mounted on " standoffs.

(http://i1362.photobucket.com/albums/r688/russrutledge/DSCN2084_zpsad667dd5.jpg)

gut shot

(http://i1362.photobucket.com/albums/r688/russrutledge/DSCN2082_zps8618731b.jpg)

back of card

(http://i1362.photobucket.com/albums/r688/russrutledge/DSCN2079_zps242b6f2f.jpg)

Schematic

(http://i1362.photobucket.com/albums/r688/russrutledge/DSCN2069_zps7e785a6c.jpg)
Title: Re: OMG Fuzz Version 1
Post by: Cozybuilder on August 28, 2014, 12:38:29 PM
Heres the vero layout:

(http://i1362.photobucket.com/albums/r688/russrutledge/DSCN2068_zps09a10070.jpg)

and box layout:

(http://i1362.photobucket.com/albums/r688/russrutledge/DSCN2081_zps20b791dd.jpg)
Title: Re: OMG Fuzz Version 1
Post by: Luke51411 on August 28, 2014, 01:11:28 PM
3 16mm pots and an spdt in a 1590A  :icon_eek:
Much props. Very nice work.
Title: Re: OMG Fuzz Version 1
Post by: bluebunny on August 29, 2014, 03:01:24 AM
3 16mm pots and an spdt in a 1590A  :icon_eek:

Nah.  Photoshop.   :D
Title: Re: OMG Fuzz Version 1
Post by: WhiskeyMadeMeDoIt on August 29, 2014, 03:48:10 AM
Russ does some unbelievable 1590a builds.  He has an abductor delay he is working on   :icon_eek: in a 1590a !? Amazing is an understatement. 
Title: Re: OMG Fuzz Version 1
Post by: bluebunny on August 29, 2014, 08:23:49 AM
Russ does some unbelievable 1590a builds.  He has an abductor delay he is working on   :icon_eek: in a 1590a !? Amazing is an understatement.  

You're not wrong.  He's not "Cosybuilder" for nothing!    :icon_biggrin:
Title: Re: OMG Fuzz Version 1
Post by: duck_arse on August 29, 2014, 10:14:17 AM
gah!

with an external nut dc socket, maybe a fourth pot? very nice. can I see a pic with the plugs in plugged?
Title: Re: OMG Fuzz Version 1
Post by: Luke51411 on August 29, 2014, 10:44:01 AM
gah!

with an external nut dc socket, maybe a fourth pot? very nice. can I see a pic with the plugs in plugged?
Or the low profile dc jack like BLMS sells, you could put that under the LED possibly. Madness  :icon_evil: :icon_eek: :icon_exclaim:
Title: Re: OMG Fuzz Version 1
Post by: samhay on August 29, 2014, 11:05:49 AM
Seeing as were are way off-topic...

You can get 4 16mm pots into a 1590A with a regular DC jack and a 3PDT without too (I use this liberally) much trouble.
You can't see them, but there are 4 pots under the board in here: http://www.diystompboxes.com/smfforum/index.php?topic=102172.msg904975#msg904975

What blew my mind was where Russ put a Belton BTDR-2 reverb brick in one of these!
http://www.diystompboxes.com/smfforum/index.php?topic=105109.msg971201#msg971201
Title: Re: OMG Fuzz Version 1
Post by: Cozybuilder on August 29, 2014, 03:43:58 PM
Very happy to see this thread is being read- the circuit is worthy of a tryout.

@Sam- I hadn't seen your Decompression Overdrive- it looks interesting, and I look forward to breadboarding it- will probably build it too (I've got to try 4 16mm pots  :icon_lol: )
Title: Re: OMG Fuzz Version 1
Post by: Cozybuilder on August 29, 2014, 04:28:13 PM
@ DA: Here are a couple of close-up shots of the next build- jack holes are in the same location: Note that the sleeve connection tab is nipped from the input, and the output is the on/off.

(http://i1362.photobucket.com/albums/r688/russrutledge/DSCN2088_zpsa0f30e6c.jpg)

(http://i1362.photobucket.com/albums/r688/russrutledge/DSCN2090_zps3318cbbd.jpg)

(http://i1362.photobucket.com/albums/r688/russrutledge/DSCN2091_zps48f2b858.jpg)
Title: Re: OMG Fuzz Version 1
Post by: duck_arse on August 30, 2014, 10:42:29 AM
cozy - as rg says somewhere else, if all your pedals are external dc supply, why have an on/off jack switching? you could *save* some space with a pair of monos, no?

I use x-wings on my builds, so that's a bit more space in my box gone. that and the home-made, hand-bent with the wood and the extra brackets and all, and my crap measure, hit, drill process means I'd never be able to do fits like yours.

cases with fixed dimensions? luxury!
Title: Re: OMG Fuzz Version 1
Post by: Cozybuilder on August 30, 2014, 04:03:31 PM
You are right! So obvious now that its been pointed out. :icon_rolleyes: A 4-16mm pot pedal is now a priority.

Re hole accuracy, some of my earlier builds were embarrassing, lots of drill bit wander . The old (50yrs+) drill press was well worth repairing.
Title: Re: OMG Fuzz Version 1
Post by: samhay on September 01, 2014, 05:11:19 AM
@Sam- I hadn't seen your Decompression Overdrive- it looks interesting, and I look forward to breadboarding it- will probably build it too (I've got to try 4 16mm pots  :icon_lol: )

Probably best to consider this a circuit snippet rather than a finished product. It really needs some filtering/tone control and the 'decompression' and 'asym.' controls are possibly too interactive to warrant both of their inclusion. Worth a play with on the breadboard though.
Title: Re: OMG Fuzz Version 1
Post by: Cozybuilder on September 18, 2014, 05:19:29 PM
How about a small box build?

Same circuit as the Vero build above with choice of blue LED or Ge (1N34a) clipper, and tone control, in a 1590LB box. It sounds just like the Vero build.

(http://i1362.photobucket.com/albums/r688/russrutledge/18f7236c-8b75-42be-bfff-f67c4318752a_zpsd20b633f.jpg)

Guts:

(http://i1362.photobucket.com/albums/r688/russrutledge/bd30af83-859d-4b3c-9be1-4d7c2c5ca3b7_zps1818aaab.jpg)

Definitely smaller than a 1590A, but still a usable size.

(http://i1362.photobucket.com/albums/r688/russrutledge/DSCN2126_zps821f566f.jpg)
Title: Re: OMG Fuzz Version 1
Post by: bluesdevil on September 20, 2014, 01:27:38 AM
Hats off to you guys using the small boxes.... absolutely sick! Those pics are enough to inspire me to give a try one day soon.
About time to ween myself off my beloved 125-B.
Title: Re: OMG Fuzz Version 1
Post by: Plexi on August 26, 2017, 09:33:21 PM
Looks very very interesting... I should give it a try  :icon_confused:
 :)

Bump for this great looking fuzz!
Title: Re: OMG Fuzz Version 1
Post by: suryabeep on August 27, 2017, 10:19:27 AM
Aw man, this fuzz seems promising from the descriptions but all the picture are on photo bucket  so I can't see them [emoji20] could someone please repost them with a different image uploader? Also, Sound clips!
Title: Re: OMG Fuzz Version 1
Post by: dv8r601 on August 27, 2017, 11:04:08 AM
Aw man, this fuzz seems promising from the descriptions but all the picture are on photo bucket  so I can't see them [emoji20] could someone please repost them with a different image uploader? Also, Sound clips!

Just build OP'S Vero layout. I did and it blew me away. Or go to effectslayouts.blogspot.com and there is a perf layout and pcb layout. This is the most amazing fuzz ever
Title: Re: OMG Fuzz Version 1
Post by: GGBB on August 27, 2017, 01:24:43 PM
Aw man, this fuzz seems promising from the descriptions but all the picture are on photo bucket  so I can't see them [emoji20] could someone please repost them with a different image uploader? Also, Sound clips!

I have a tampermonkey/greasemonkey script if you use one of those plugins in firefox or chrome: https://openuserjs.org/scripts/gtranter62/PhotoBucketImageReplacer. Set up to work only on diysb but you can easily change that. One trick is that after you click the photobucket link you need to reload (F5) or you will still see the upgrade image.

Title: Re: OMG Fuzz Version 1
Post by: Plexi on August 27, 2017, 01:41:03 PM
Aw man, this fuzz seems promising from the descriptions but all the picture are on photo bucket  so I can't see them [emoji20] could someone please repost them with a different image uploader? Also, Sound clips!

Just build OP'S Vero layout. I did and it blew me away. Or go to effectslayouts.blogspot.com and there is a perf layout and pcb layout. This is the most amazing fuzz ever
Thats right!
David made an excelent work there
Title: Re: OMG Fuzz Version 1
Post by: Cozybuilder on August 27, 2017, 02:14:18 PM
Another Photobucket casualty. I built a total of 4 of these, 3 in 1590A,s and 1 in a 1590LB. I sent the 1590A's to Michael to record, he still has them. The 1590LB is still one of my favorites.

Here are the docs for the as-built perf version. If I were to redo this, I would change the power scheme: instead of 1N4001, I would use a 1N5817 Schottky, followed by 47R in series, then 100uF electro and 100nF ceramic in parallel to ground.

(https://s26.postimg.org/gyyxeq0m1/DSCN2069.jpg)  (https://s26.postimg.org/o3gqnr7vd/DSCN2067.jpg)  (https://s26.postimg.org/csiod4qe1/DSCN2068.jpg)  (https://s26.postimg.org/sf9xqi461/DSCN2073.jpg)  (https://s26.postimg.org/rr137k5g9/DSCN2074.jpg)  (https://s26.postimg.org/i7ree3hy1/DSCN2084.jpg)  (https://s26.postimg.org/qrasbuqah/DSCN2082.jpg)

(https://s26.postimg.org/psuf9kcyh/DSCN2128.jpg)  (https://s26.postimg.org/j1406pnyx/DSCN2129.jpg)
Title: Re: OMG Fuzz Version 1
Post by: Plexi on August 27, 2017, 07:01:24 PM
Cozy.. amazing job!
I hate the veroboards...but your work made me reconsider it
Title: Re: OMG Fuzz Version 1
Post by: Cozybuilder on August 27, 2017, 10:31:22 PM
Thank you! Vero is not my favorite either, but enough people use it I thought it was worthwhile to do a layout, and of course had to build it to verify. Most of my builds are on plain perf, with occasional PCB builds.
Title: Re: OMG Fuzz Version 1
Post by: Egon Juver on February 14, 2018, 06:28:34 AM
Hello, I'm from Brazil and I have a question: does the blue LED (first layout) work like a led flash or something like that, does it change the brightness (as if it blinks) how much do I play? If not, would there be any way to do it, then a led "blinking" in addition to the led on / off? I hope I have been able to explain my doubt ...  Thanks for any reply / info.reply / info.
Title: Re: OMG Fuzz Version 1
Post by: duck_arse on February 14, 2018, 08:22:37 AM
Hello, Brazil, welcome to the forum.

the blue led - no, and maybe. it might flash sometimes, but it will be a disappointing effect. it is only meant to clip/bias the transistor, not provide visual display. there are some "sound to light" circuit things to find on this forum, tho, which might be the easiest way to do your thing.
Title: Re: OMG Fuzz Version 1
Post by: Egon Juver on February 15, 2018, 05:52:28 AM
Thanks duck_arse.
I'll try to find something here in the forum then.
Title: Re: OMG Fuzz Version 1
Post by: dv8r601 on February 15, 2018, 03:20:27 PM
I love this circuit. It can tell you when clipping is going on but a lower Vf LED is needed. I tried a pair of 3mm IR(infrared-Purple) LEDs and they start lighting up and flashing as soon as the gain is past 9 o clock. I have 2 holes drilled in tg3 enclosure for them and they are like the seeing eye mod keeley does on the Boss DS1. But that said the Vf of these is nearly half that of the blue LED the scheme calls for.