Guyatone - HD2 Harmonic Distortion [schematic]
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Hi! first post here...
I own a little mean Guyatone HD2, a distortion/fuzz pedal, plenty of gain and very bright... The manufacturer's website claims it is similar to a 70's Big Muff, but I've never made any confrontation... The sound is very good, very "harmonic" but it lacks a tone control... I guess with some little mods it could be a great effect.
I could try and take some gutshots if anyone is interested...
I own a little mean Guyatone HD2, a distortion/fuzz pedal, plenty of gain and very bright... The manufacturer's website claims it is similar to a 70's Big Muff, but I've never made any confrontation... The sound is very good, very "harmonic" but it lacks a tone control... I guess with some little mods it could be a great effect.
I could try and take some gutshots if anyone is interested...
- RnFR
- Old Solderhand
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yeah, that one always seemed to be a nice sounding pedal. i'm interested!
"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
Blog-APOCALYPSE AUDIO
Blog-APOCALYPSE AUDIO
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all right, as soon as i find my camera i'll take some photos!
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Here are the gutshots... my camera isn't very good at macros
IC is a JRC4558, transistors are 2 c1815 and 3 k30a
I'm gonna send Guyatone an email, and ask if they could send me the schematic, because the circuit is pretty damn tight...
IC is a JRC4558, transistors are 2 c1815 and 3 k30a
I'm gonna send Guyatone an email, and ask if they could send me the schematic, because the circuit is pretty damn tight...
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- Ben N
- Cap Cooler
Maybe an opamp Little Big Muff or Muff Fuzz with buffered bypass? Sure ain't a BMP... BTW, I had a number of those tiny Guyatone pedals (not this one) some years back, and sold them all because of their significant tone-sucking--not a good bypass at all, whatever it is.
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So the guys @ Godlyke kindly sent me the original schematic...
i've read the forum rules but i didn't understand if i can post it or if i have to redraw it...
or perhaps i could just upload it to an hosting site and post the link?
i've read the forum rules but i didn't understand if i can post it or if i have to redraw it...
or perhaps i could just upload it to an hosting site and post the link?
- soulsonic
- Old Solderhand
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You can attach it to a message here with the upload feature at the bottom of the reply screen.
Or you could send it to me to re-draw.
Or you could send it to me to re-draw.
"Analog electronics in music is dead. Analog effects pedal design is a dead art." - Fran
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all right, here it is!
i hope i can come up with some mods to make it more "usable"... for example, a tone control, or a true bypass mod...
i hope i can come up with some mods to make it more "usable"... for example, a tone control, or a true bypass mod...
- Attachments
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- HD-2 SCHEMATIC.PDF
- Guyatone HD-2 Schematic
- (47.39 KiB) Downloaded 843 times
- RnFR
- Old Solderhand
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hmmm... so it looks muff-like with a few differences. IC input and makeup stages, no muff-tone control, no true bypass, and what probably has the biggest impact on it's tone(besides lack of tone control), is the pair of 1n60's on the output of Q1 causing crossover distortion. maybe that's the "harmonic" in the HD2? haven't seen that mod in a muff circuit before, looks interesting...
"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
Blog-APOCALYPSE AUDIO
Blog-APOCALYPSE AUDIO
- soulsonic
- Old Solderhand
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Thanks!
It looks like all the components for the tone control are there, it is just permanently wired in the halfway position. You could remove R8 and R7 and replace them with a 100k control wired as is normally seen in a Big Muff.
Can you see the value of R9 on your unit? The value in the schematic is missing or incorrect.
It looks like all the components for the tone control are there, it is just permanently wired in the halfway position. You could remove R8 and R7 and replace them with a 100k control wired as is normally seen in a Big Muff.
Can you see the value of R9 on your unit? The value in the schematic is missing or incorrect.
"Analog electronics in music is dead. Analog effects pedal design is a dead art." - Fran
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i'll try and take a look, but as you can see from the gutshots all the components are mounted "upways" (dunno if it's the right term, sorry, i'm not a native english speaker )soulsonic wrote:Thanks!
It looks like all the components for the tone control are there, it is just permanently wired in the halfway position. You could remove R8 and R7 and replace them with a 100k control wired as is normally seen in a Big Muff.
Can you see the value of R9 on your unit? The value in the schematic is missing or incorrect.
so a switch to include/exlude the1n60s could turn it into a more "classic" muff?
- Ben N
- Cap Cooler
Well, I'll be. I'm so used to seeing discrete in/output buffers on opamp-based circuits that it didn't occur to me that they'd sandwich the heart of a Big Muff between opamp stages, but it does make sense. Pretty cool.
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Hi, i reuploaded the schematic beacause it was no longer online!
- Attachments
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- HD-2 SCHEMATIC.PDF
- (47.39 KiB) Downloaded 679 times
I just got one of these in a trade and it has a broken switch and led, fixed the switch and still havent figured out the led, but did you ever figure out a True Bypass mod? I'm sure this is similar to one of the old MXR spdt switches, right? Thanks, and I know this is half a decade old... regards ChrisJellyBelly wrote:all right, here it is!
i hope i can come up with some mods to make it more "usable"... for example, a tone control, or a true bypass mod...
- Manfred
- Tube Twister
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I could make a PCB-layout clone according the shots above, but all attachments does not exist anymore.EmmG wrote:Has anyone cloned this/ have a layout?