tag:blogger.com,1999:blog-6847048658257278783.post2930344844130035870..comments2024-03-29T01:36:12.851+00:00Comments on Guitar FX Layouts: EHX Muff Fuzzes!IvIarkhttp://www.blogger.com/profile/08416945174853142251noreply@blogger.comBlogger86125tag:blogger.com,1999:blog-6847048658257278783.post-19862470788024153962023-11-20T09:39:40.305+00:002023-11-20T09:39:40.305+00:00Sorry, just a question about the off board wiring ...Sorry, just a question about the off board wiring . How i connect the potenziometer ground if there is another one in the pcb? im new in pedal building and i don't understand the ground wiring.Edoardo villahttps://www.blogger.com/profile/15914533606937189125noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-80907779966121194942022-09-01T18:13:44.698+01:002022-09-01T18:13:44.698+01:00Thanks.I'd never seen the Jack Orman one befor...Thanks.I'd never seen the Jack Orman one before (i see it was drawn in 2020 which explains that). But for anyone experiencing gating low output fuzz with the opp amp layout I'd say try sticking a resistor across the diodes to add boost there before giving up on the build. That seems to be the element that's missing from many of the schematics (even taking into account EHX s approach to changing circuits apparently randomly).SWhttps://www.blogger.com/profile/04012077863633210810noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-14274752939693257472022-05-22T11:10:01.298+01:002022-05-22T11:10:01.298+01:00I'm not sure about an original schematic, I co...I'm not sure about an original schematic, I could say that the this IC Muff had at least a brief period of a slightly different production. (Electro Harmonix used to do it: see the classic Big Muff!).<br />Actually the most accurate schematic, or at least the most available and easier to find is the one used to draw the layout at the top of the page and other layouts.<br />Indeed, I found several of this version, but I post one for all:<br />http://beavisaudio.com/schematics/Images/Electro-Harmonix-Muff-Fuzz-Opamp-Schematic.png<br /><br />Then I found this one:<br />http://www.montagar.com/~patj/fuzz001.gif<br /><br />This one, I guess directly drawn got from an original pedal:<br />https://i1268.photobucket.com/albums/jj574/nwells200/20170408_215339_zpsw1nqh3xu.jpg<br /><br />And this one, maybe a modern version based on that alternative version:<br />https://www.muzique.com/schem/EHX_Muff_Fuzz.png<br /><br />I just find all these schematic on google. Maybe you should try to do it, and to go into the pages for more details.Elijah-Baleyhttps://www.blogger.com/profile/16374916649117645180noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-31940575685971574532022-05-21T07:55:25.721+01:002022-05-21T07:55:25.721+01:00Elijah, would you be able to post links to those o...Elijah, would you be able to post links to those other schematics, if you have them? Cheers.SWhttps://www.blogger.com/profile/04012077863633210810noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-23157171669105788422022-05-21T07:49:47.161+01:002022-05-21T07:49:47.161+01:00I forget which forum I saw it on, but the guy was ...I forget which forum I saw it on, but the guy was actually holding the pub from an original unit and labelling the parts. I'd bread boarded the I C version a while back using the schematic without these parts. I never went further with it. I'll try again! There were different versions, but i think that was mainly around changing the bias resistors, nothing that would effect the operation or sound. SWhttps://www.blogger.com/profile/04012077863633210810noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-10528570034702099372022-04-06T09:04:51.117+01:002022-04-06T09:04:51.117+01:00I don't know if the schematic of this layout i...I don't know if the schematic of this layout is incorrect, actually, I found some schematics with some other difference, not just the 470k resistor in parallel with the diodes: but even a ceramic cap; some values are different; and there's a coupling cap between the two stages.<br /><br />I'm not sure, but maybe there are different versions?Elijah-Baleyhttps://www.blogger.com/profile/16374916649117645180noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-13535867804873448662022-04-05T15:06:18.703+01:002022-04-05T15:06:18.703+01:00From what I've read elsewhere, after a pretty ...From what I've read elsewhere, after a pretty extensive search, most of the schematics online are incorrect for the IC version. There should be a 470K resistor running parallel to the diodes and also a small capacitor (I think it was 100pf).SWhttps://www.blogger.com/profile/04012077863633210810noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-54114379198010131082021-12-31T18:27:11.415+00:002021-12-31T18:27:11.415+00:00Just built the transistor version and it sounds ni...Just built the transistor version and it sounds nice. The only problem is that it only works when the pedal after is on as well. Seems to me that indicates a grounding problem but I can't figure out in what way. I usually struggle with grounding my builds. Is there a general theory about grounding that can help me?Lauchmannhttps://www.blogger.com/profile/14406921490459328732noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-90797740726305515282020-12-23T11:50:19.992+00:002020-12-23T11:50:19.992+00:00I just built the transistor version. Used 1N4148 i...I just built the transistor version. Used 1N4148 instead of the 1N34A diodes. It seems that on my strat it really does not get fuzzy until I pass 8 on the strat volume. Is there something wrong? If I have a wha pedal on in front then I get more fuzz of course and through a bigger range on the guitar volume. The knob on the pedal I can use to get the amp to provide the fuzz, so the pedal seems more like a booster?Unknownhttps://www.blogger.com/profile/08622974839998682412noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-71599010253669035172020-11-18T02:22:08.605+00:002020-11-18T02:22:08.605+00:00Late to the party here but I messed around with Op...Late to the party here but I messed around with Opamp version. Like most people said here, it's very quiet. The R1 100K resistor looks off. The pedal PCB version uses a 1K resistor (also has 100uf electro cap from power to ground). The Double Muff which is transistor based has R1 as 22K. That 100K may be a typo. I tried both a 1K and 10K and the volume increased significantly. Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-85654828529609680232018-08-08T03:11:20.000+01:002018-08-08T03:11:20.000+01:00This comment has been removed by the author.Jasonhttps://www.blogger.com/profile/13463368355644979091noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-52279026579021764292018-04-02T17:22:30.282+01:002018-04-02T17:22:30.282+01:00Built the transistor version as my first pedal rec...Built the transistor version as my first pedal recently! Found a great little mod here for a little extra gain too, I think it makes it like a cross between a Muff Fuzz and a Fuzz Face... http://www.diystompboxes.com/smfforum/index.php?topic=77456.0Anonymoushttps://www.blogger.com/profile/16295503785376847491noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-28986596699674429232017-09-16T09:02:53.392+01:002017-09-16T09:02:53.392+01:00This comment has been removed by the author.ghalalbhttps://www.blogger.com/profile/16301768577775395722noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-43088116827118313702017-09-16T08:44:44.675+01:002017-09-16T08:44:44.675+01:00This comment has been removed by the author.ghalalbhttps://www.blogger.com/profile/16301768577775395722noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-48553996273484341312016-10-10T00:02:01.337+01:002016-10-10T00:02:01.337+01:00Hey man. Good info. The 47uF/100uF cap is just a p...Hey man. Good info. The 47uF/100uF cap is just a power filtering cap, so I think either value you're good. As for the transsistors, these were widely used by EHX back in the day, and it's their own numbering, and were 2N5133 transistors. Which are hard to get good ones now a days unless you pay through the nose. Zachhttps://www.blogger.com/profile/00044917566185720896noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-16415013175576786482016-10-09T21:46:21.840+01:002016-10-09T21:46:21.840+01:00My dad has an old one that I just popped open, and...My dad has an old one that I just popped open, and it's got a 100uF electrolytic cap (as opposed to the 47uF in the layout), but much more interestingly, it has a pair of old FS36999's in there too! :) Galapagoshttps://www.blogger.com/profile/14002330833026885261noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-88825805939754697102016-05-14T20:32:40.184+01:002016-05-14T20:32:40.184+01:00Built the transistor one and it works a charm. Did...Built the transistor one and it works a charm. Didn't have any 1N34a's so put some 1N4148's in and it sounds lovely. Built a second one when the 1N34a's had arrived and they created a much bigger fuzz tone. I can see why people would change the input cap to something smaller with the Ge's but with 4148's 0.1uf is about right for bass response. Also added a 47k lin pot before it (just acts like rolling off the volume on your guitar) and you can clean it right up.JSA Effectshttps://www.blogger.com/profile/17007168972057866949noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-68672986774811776732016-03-09T19:56:31.084+00:002016-03-09T19:56:31.084+00:00I've built these a bunch of ways so far and I ...I've built these a bunch of ways so far and I find them all pretty good to great. Using ge transistors nte101, it can dial in a really nice dirty overdrive, even better if you change the input cap to something smaller, like 10n.<br />I had a harder time getting the opamp to sound the way I wanted, and ultimately changed the chip for a 5532 and swapped the diodes for silicon ones... I've tried a bunch of se diodes and they're all pretty good. The key is changing the diodes. I love the 5532's, they are a lot quieter at the highest setting, but with ge diodes, its tough getting enough headroom. <br />anyway... I think this is a great circuit, and certainly a great base circuit to build off of.geof hancockhttps://www.blogger.com/profile/18237710688339153919noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-69330691543215378082016-02-07T21:09:54.215+00:002016-02-07T21:09:54.215+00:00got this (Transistor version 2n5088's) built w...got this (Transistor version 2n5088's) built with flying leads to be able to switch between different clipping diodes, and also with a 100k lin pot in place of the far right 100k resistor to act as a gain control. Works nicely but there is silence until the 'gain' control is up to around 3ish and then nice smooth sweep to full, nice warm sounding fuzz/overdrive, especially on a slightly crunchy amp. With the clipping diodes switched out there is an immediate volume boost but of course a cleaner sound, more like a clean boost that starts to get a little bit of grit on full. Any particular recommendations for the best clipping diodes to try? and how do I make the 'gain' pot usable over it's full range?<br /><br />Thanks In advance :o)Pavloshttps://www.blogger.com/profile/01014262540021503034noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-30871122196781068872015-06-15T17:33:41.199+01:002015-06-15T17:33:41.199+01:00I really want to make the op-amp version but i wou...I really want to make the op-amp version but i would like a gain control. How should I do such a thing. Put a pot in parallel with the diodes? I'm really just getting in to making my own pedals and help would be much appreciated. <br /><br />Anonymoushttps://www.blogger.com/profile/18345429744564192952noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-69981180671191875792015-05-20T21:46:36.425+01:002015-05-20T21:46:36.425+01:00Mark swapped around the channels of the IC to bett...Mark swapped around the channels of the IC to better suit his drawing style. Both layouts match the schematic but this one left side of the dual opamp first while the other uses the right side first. This makes no difference to sound/operation.Ciaran Hasletthttps://www.blogger.com/profile/14841971807120256954noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-81922441821581903212015-05-20T18:52:17.583+01:002015-05-20T18:52:17.583+01:00So strange that manny have built the opamp version...So strange that manny have built the opamp version succesfully, wich means the Andrew Carrel 2006 version is with the opamp upside down. Or maybe It's just my eyes. :-)<br /><br />https://guitar-gear.ru/forum/index.php?app=core&module=attach&section=attach&attach_rel_module=post&attach_id=13220RareDevilhttps://www.blogger.com/profile/08659408560527704081noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-61032993491313021312015-04-13T18:14:05.978+01:002015-04-13T18:14:05.978+01:00Built both of these today. For the transistor vers...Built both of these today. For the transistor version i tried 1N60P 1N4148 and OA91s. The nicest seemed to be the OA91s. However, the Ges do make it a lot quieter so i use a boost pedal to give it some ass.<br />The opamp version seems to sound good with both silicon and Ges i found the best Ges were 1N60P and the silicon 1N4148s, but mess around as i only have a few diodes worth trying.Hozy31https://www.blogger.com/profile/16714771534041521767noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-44878300607240050952014-06-30T21:47:15.316+01:002014-06-30T21:47:15.316+01:00I was wondering if it's possible to add a gain...I was wondering if it's possible to add a gain pot to op amp version? I was able to on the transistor version by replacing the 100k on the far right side with a 100kb pot. It sounds really good!MadWagnerhttps://www.blogger.com/profile/01829209684898478688noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-30477296756773107552014-05-18T01:03:25.321+01:002014-05-18T01:03:25.321+01:00Just pulled the 10uf cap thinking the polarity mig...Just pulled the 10uf cap thinking the polarity might be off and now my board is giving out an overdriven sound. It's a bit muddy and quiet. is that the muff sound?BoltBagshttps://www.blogger.com/profile/03121448579741578565noreply@blogger.com