EHX - Graphic Fuzz [schematic]
- soggybag
- Resistor Ronker
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Has anyone seen a schematic for the EHX Graphic Fuzz? This looks pretty interesting. I'm curious how it works.
Blog: http://super-freq.com
- dune2k
- Breadboard Brother
i got the factory schematic, if anyone wants to redraw it pm me & i'll send it to them so they can post it.
JOHNO wrote:P.S Great pedal for playing 70's porn music.
- RnFR
- Old Solderhand
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moved to modern section. and yes, it needs to be redrawn before we can post it.
"You've converted me to Cubic thinking. Where do I sign up for the newsletter? I need to learn more about how I can break free from ONEism Death Math." - Soulsonic
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- Sweetalk
- Solder Soldier
I JUST got one this week, I love the EQ and wanted to see the schematic. A little bit annoying the 40V supply. It came with the original EHX power supply but 110V (220V AC line in my country).
- borislavgajic
- Opamp Operator
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EHX bassmicrosynth,EHX EnglishMuffin,Tube Phaser,springtubereverb ,greyDOD,FulldriveII mosfet,OCD,VOX repeat percussion,RingStinger,Meatball,12stage phaser.... - Location: Sombor , Serbia
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Thanks....it is more then 2 cents!!!!!
if it is possible to unscrew 3 screws and take photo of component side?
thanks
Boris
if it is possible to unscrew 3 screws and take photo of component side?
thanks
Boris
- borislavgajic
- Opamp Operator
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- Posts: 1542
- Joined: 27 Feb 2008, 14:23
- Completed builds: ...script phase90,ETI phaser,Ross phaser,mutronC200,vox wah,WH10,FW-3,mutronIII,DrQuack,Penfoldautowah,Tubezipper,
Dipthonizer,seekwah,Talkingpedal,morleywha
...soulpreacher,dynacomp,compulator
...buzzaround,fuzzfactory,screwdriver,sho,superdouper,St-9,RogerMayer octavia,Tychobrahe octavia,paralelluniverse,string damper,slowgear
...CE-2,ibanez fL301,EH theCloneTheory
EHX bassmicrosynth,EHX EnglishMuffin,Tube Phaser,springtubereverb ,greyDOD,FulldriveII mosfet,OCD,VOX repeat percussion,RingStinger,Meatball,12stage phaser.... - Location: Sombor , Serbia
- Has thanked: 131 times
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Can somebody please post component side of this pedal?
thanks
Boris
thanks
Boris
- Dirk_Hendrik
- Old Solderhand
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Can anyone give a comment on the sound? I played one some 2 years ago after fixing it and still wonder why anyone would spend money in this thing while there's many, far better sounding and cheaper, Behringers around?
- Dirk_Hendrik
- Old Solderhand
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andborislavgajic wrote: if it is possible to unscrew 3 screws and take photo of component side?
thanks
Boris
borislavgajic wrote:Can somebody please post component side of this pedal?
thanks
Boris
Slut.....
- borislavgajic
- Opamp Operator
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- Posts: 1542
- Joined: 27 Feb 2008, 14:23
- Completed builds: ...script phase90,ETI phaser,Ross phaser,mutronC200,vox wah,WH10,FW-3,mutronIII,DrQuack,Penfoldautowah,Tubezipper,
Dipthonizer,seekwah,Talkingpedal,morleywha
...soulpreacher,dynacomp,compulator
...buzzaround,fuzzfactory,screwdriver,sho,superdouper,St-9,RogerMayer octavia,Tychobrahe octavia,paralelluniverse,string damper,slowgear
...CE-2,ibanez fL301,EH theCloneTheory
EHX bassmicrosynth,EHX EnglishMuffin,Tube Phaser,springtubereverb ,greyDOD,FulldriveII mosfet,OCD,VOX repeat percussion,RingStinger,Meatball,12stage phaser.... - Location: Sombor , Serbia
- Has thanked: 131 times
- Been thanked: 277 times
Hey Dirk what do you say???
Hey Sweetalk...thank you very much...if you find time.....I know you have other important things in your life....so take your time
thanks
Boris
Hey Sweetalk...thank you very much...if you find time.....I know you have other important things in your life....so take your time
thanks
Boris
- mictester
- Old Solderhand
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Sorry it's a bit late, but here's my slightly modified Graphic Fuzz. I haven't made any changes to the signal path, just to the stupid power supply arrangement. The circuit works on +/-12 Volts at low current, so a simple pair of half wave rectifiers and two regulator ICs with a bit of filtering is perfect for the job. The power supply that was originally in this pedal was just plain stupid - 40 Volts and big power resistors to drop most of those volts and radiate much of the power fed to the board as heat!
Here's the re-draw: I've got a lashed together version of this thing, and it's quite good, but more can be done with the distortion section....
Here's the re-draw: I've got a lashed together version of this thing, and it's quite good, but more can be done with the distortion section....
"Why is it humming?" "Because it doesn't know the words!"
- Ben N
- Cap Cooler
Son of a Gun! I thought it was something more like a Quadrafuzz, with separately distorted bands, but it's really a distortion with an eq tacked on.
- mictester
- Old Solderhand
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Exactly. It could be interesting to make the bands each feed their own distortion stage (like the quadrafuzz), make the distortion stages switchable (feedback diodes around an op-amp or diodes to ground), and introduce similar filters after each distortion stage.....Ben N wrote:Son of a Gun! I thought it was something more like a Quadrafuzz, with separately distorted bands, but it's really a distortion with an eq tacked on.
"Why is it humming?" "Because it doesn't know the words!"
- Ben N
- Cap Cooler
I was thinking something like the eq stage of the Graphic Fuzz feeding CMOS--two hex inverters gives you six 2-inverter distortion blocks.mictester wrote:Exactly. It could be interesting to make the bands each feed their own distortion stage (like the quadrafuzz), make the distortion stages switchable (feedback diodes around an op-amp or diodes to ground), and introduce similar filters after each distortion stage.....Ben N wrote:Son of a Gun! I thought it was something more like a Quadrafuzz, with separately distorted bands, but it's really a distortion with an eq tacked on.
Can anyone post the schematic of the original power supply for this effect? I'm trying to fix the effect, which was heavily modified and I need to know how the original power supply looked like. Another problem that I have is with 4kHz filter. It does not work but what is interesting I simulated the schematic posted above and it also does not work (most probably due to some other reason). Is the 4kHz part drawn correctly on the schematic?
Mark
Mark