tag:blogger.com,1999:blog-6847048658257278783.post1546779467394562481..comments2024-03-28T18:53:30.726+00:00Comments on Guitar FX Layouts: T-Rex MudhoneyIvIarkhttp://www.blogger.com/profile/08416945174853142251noreply@blogger.comBlogger82125tag:blogger.com,1999:blog-6847048658257278783.post-55833463993261976912023-01-03T18:25:04.175+00:002023-01-03T18:25:04.175+00:00There's a new "V1.1" layout up on th...There's a new "V1.1" layout up on the page... :)<br /><br />Thanks K!<br />+mmirosolhttps://www.blogger.com/profile/02400327798106357876noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-17049830990936277552023-01-02T20:59:16.090+00:002023-01-02T20:59:16.090+00:00I was quite surprised myself when I traced it, as ...I was quite surprised myself when I traced it, as I too find this a bit odd. Actually, to be absolutely sure, I just went over it again... They are in fact parallel as written in the trace. :) Khttps://www.blogger.com/profile/11079155645884627907noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-60094164575213463572023-01-02T18:24:57.000+00:002023-01-02T18:24:57.000+00:00It's a good trace. I'm still a bit skeptic...It's a good trace. I'm still a bit skeptical if the 2K2 in parallel with the gain pot would work. Don't have the pedal myself, so i can't check it out. But.. If you are sure, well then..<br />Guess i'll need to draw a v1.1 layout soon :)<br /><br />Being the skeptic i am (quite compassionate, in merseyside style), i asked the same question on FSB. My first gut feeling says that it shouldn't work like that. But i've been proven to be wrong before.<br />+mmirosolhttps://www.blogger.com/profile/02400327798106357876noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-33627965029704457752023-01-02T12:25:33.933+00:002023-01-02T12:25:33.933+00:00I've now tried to trace the whole thing - here...I've now tried to trace the whole thing - here is my schematic: https://ibb.co/xzj3KDW<br />Also, to answer your question from earlier, C1 actually doesn't exist. In the old schematics there are 22 capacitors, but in reality there are only 21 in the circuit. So there must have been some small mistake happening there. <br /><br />My pedal is a v1.1<br /><br />Have a look and please notify me if something looks off; even though I think I've been over everything a few times, something surely can be missed or mistraced. Also, this is my first trace.. :-) Khttps://www.blogger.com/profile/11079155645884627907noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-72187037005812645712022-12-30T11:48:11.780+00:002022-12-30T11:48:11.780+00:00Hmm.. I think I will have to take a deeper dive. I...Hmm.. I think I will have to take a deeper dive. I mainly tried to figure out just the boost problem. I've incorporated the changes in my build, and the boost works much more as it should - but something is still off compared to the original. I will try do do a full trace and a new schematic in the next days. Khttps://www.blogger.com/profile/11079155645884627907noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-59813456110290656562022-12-30T08:51:17.924+00:002022-12-30T08:51:17.924+00:00The 2.2k resistor is moved in your corrected schem...The 2.2k resistor is moved in your corrected schematic, but where is the 100nF (C1 in the LJTHVMr schematic linked above) It is missing?Elijah-Baleyhttps://www.blogger.com/profile/16374916649117645180noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-56270773894610613352022-12-29T14:54:23.038+00:002022-12-29T14:54:23.038+00:00Both of the schematics are wrong, they must've...Both of the schematics are wrong, they must've been the result of the same incorrect tracing. I've just traced an original Mudhoney, and instead of trying to type out the differences, I've made corrections in the schematic - the correct way is this: https://ibb.co/x5pNG1H<br />Also the drive pot of mine is a 47K log instead of the linear 100K potKhttps://www.blogger.com/profile/11079155645884627907noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-5944864339910634052022-11-16T16:05:53.876+00:002022-11-16T16:05:53.876+00:00This comment has been removed by the author.Khttps://www.blogger.com/profile/11079155645884627907noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-88572585698301827022021-12-23T17:40:23.993+00:002021-12-23T17:40:23.993+00:00This comment has been removed by the author.Woojhttps://www.blogger.com/profile/12671476916580434575noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-8179777337141587162021-01-04T18:30:16.010+00:002021-01-04T18:30:16.010+00:00Possibly you didn't connect pin 2 (op amp) to ...Possibly you didn't connect pin 2 (op amp) to the 2.2k->100n->Gnd? That would explain unity gain until boost is engaged.BKYhttps://www.blogger.com/profile/14936051951094134098noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-14006320381108285732020-12-06T17:45:05.917+00:002020-12-06T17:45:05.917+00:00What doesn't match? The gain section has a 15...What doesn't match? The gain section has a 150R resistor from pin 2 which then goes to the Gain pot. The other side of the Gain pot then goes to pin 6. All with a 100p cap in parallel between pins 2 and 6. The switch then brings the filters (that are always in circuit with a Rat). So the Boost switch is just changing the frequency response. <br /><br />The two schematics I have for this both agree on that gain structure.<br /><br />https://ibb.co/mX13s2n<br />https://ibb.co/LJTHVMrIvIarkhttps://www.blogger.com/profile/08416945174853142251noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-26473749219024956992020-12-06T17:01:17.722+00:002020-12-06T17:01:17.722+00:00I don't understand why the gain section of thi...I don't understand why the gain section of this layout appears to be nothing like the schematic?<br /><br />I'll hold my hands up and say I haven't built it on vero, but on a breadboard and modelling it on a PC it performs with the issues described above. No gain until you push in the boost switch and then all the gain! ;-)ctznsmithhttps://www.blogger.com/profile/12785040183084467031noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-71021907348287607652019-08-08T07:01:10.062+01:002019-08-08T07:01:10.062+01:00Same thing with my too. I thought that is because ...Same thing with my too. I thought that is because it is missing the bufferd bypass, and i made it with buffered bypass like it is on the schematic with 4066 and 4069 chips and with one more transistor, but iti is same as this version with true bypass, nothing really different, same amount of gaine and same volume issues.Anonymoushttps://www.blogger.com/profile/14337557231348277188noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-59086302946287567182019-08-07T02:37:30.528+01:002019-08-07T02:37:30.528+01:00I couldnt find my problem in my previous build so ...I couldnt find my problem in my previous build so I build I second one from scratch, the EXACT same problem, so not very sure this is totally verified as is.<br />Problame I have is that unity gain vs my clean sound is gain at 50% and volume at 100%, anything below that is just quieter than my clean sound. When I switch the boost however, I get full on fuzz at a much higher volume. I once had an original Mudhoney and it didn't acted like this, and I'm pretty sure my build is exactly right :(Bohttps://www.blogger.com/profile/15306918379271648496noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-78665866467658126462019-03-07T10:00:38.566+00:002019-03-07T10:00:38.566+00:00First and second: same thing is with my project. O...First and second: same thing is with my project. Original mudhoney has FET switching bypass, not true bypass. I think that maybe this is causing that problems, because in FET switching bypass there is one more gain stage on the end of the circuit. Third: switch level 1 and level 3 and problem solved.Anonymoushttps://www.blogger.com/profile/14841086435026736212noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-12641716737459364812018-03-25T19:42:37.808+01:002018-03-25T19:42:37.808+01:00I think this was it, obviously omitting the switch...I think this was it, obviously omitting the switching side of the schematic<br /><br />http://oi66.tinypic.com/2lwnpyc.jpgIvIarkhttps://www.blogger.com/profile/08416945174853142251noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-68086079225203837352016-12-17T15:06:33.555+00:002016-12-17T15:06:33.555+00:00This comment has been removed by the author.Demianhttps://www.blogger.com/profile/12573631448661019928noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-57476355970195945442016-12-17T15:05:35.132+00:002016-12-17T15:05:35.132+00:00This comment has been removed by the author.Demianhttps://www.blogger.com/profile/12573631448661019928noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-37656071478510702152016-06-28T03:55:22.662+01:002016-06-28T03:55:22.662+01:00With the gain all the way up, my build is self osc...With the gain all the way up, my build is self oscillating when in boost mode, but just with the guitar plugged in. When I disconect the cable, the noise stops. Any ideas?Guilhermehttps://www.blogger.com/profile/06933426270421716475noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-59769507205336522832016-06-04T00:07:25.328+01:002016-06-04T00:07:25.328+01:00Having some troubles and I'm not sure if it...Having some troubles and I'm not sure if it's how the pedal is supposed to sound or if there is something wrong. If something is wrong all the things may be related I think: <br /><br />First, difference between normal and boost is MASSIVE, when gain and volume are at 12o clock my overdrive sound is quieter than my bypassed sound, this same setting on boosted results in full on fuzz (sounds good though).<br />Normal mode also doesn't have a lot of bass to my ears...<br /><br />Second, on boosted the gain really doesn't add anything more above 12 o clock, all drive seems to happen before that.<br /><br />Third, my tone control works backwards, counter clockwise results in more treble...<br /><br />Any Ideas?<br /><br />Thanks !Bohttps://www.blogger.com/profile/15306918379271648496noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-36940344582179574302015-01-14T11:59:20.124+00:002015-01-14T11:59:20.124+00:00Hi,
I build this one and it sounds very good! thx...Hi,<br /><br />I build this one and it sounds very good! thx!<br /><br />Everything works normal but, is it possible that I get noise comming true when my guitar is plugged in?<br /><br />Thx<br /><br />Anonymoushttps://www.blogger.com/profile/02263037712796075270noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-21799423525570986122014-06-01T17:18:28.275+01:002014-06-01T17:18:28.275+01:00That's pretty much where I was looking at but ...That's pretty much where I was looking at but thank you VERY much for the specifics, I'm not too familiar with the math. Also thinking of playing with the tone stack.Anonymoushttps://www.blogger.com/profile/15559641484345627677noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-10378755333471237452014-05-31T23:52:58.975+01:002014-05-31T23:52:58.975+01:00Increasing the input cap may help and so it's ...Increasing the input cap may help and so it's always worth trying, but you'll get more of an affect by altering the high pass filter at the inverting input. As standard there's a 2K2 and a 100n to ground which gives a cutoff frequency of around 723hz, and so you might want to try something like a 220n which will drop that cutoff frequency to 328hz meaning you'll be getting no attenuation between 328 to 723hz, which is right around the lower mids frequencies.IvIarkhttps://www.blogger.com/profile/08416945174853142251noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-587756794327695762014-05-31T23:16:26.042+01:002014-05-31T23:16:26.042+01:00I used to run a little green wonder before this ju...I used to run a little green wonder before this just to get a fat ass lower mid boost. I think I'm going to shoot for a modded version to achieve that sound with the mudhoney alone. Any ideas on how to approach that? I think I'm gonna start with just upping the input cap 'cause I run the gain at about 12 o'clock and it starts to get fat only after that. I have an idea of what components to play with but if anyone has a better understanding of how this circuit works, help is appreciated!Anonymoushttps://www.blogger.com/profile/15559641484345627677noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-30255462325128764692014-05-27T08:08:14.489+01:002014-05-27T08:08:14.489+01:00I just had a play on a real one, decided to check ...I just had a play on a real one, decided to check out the layout. One thing i noticed was that the tone knob just rolled off treble, wasn't one of those more bass or more treble knobs. And anything under say 3 o'clock was not nice. So maybe if change some cap values (not fully sure which caps) or make a buffered blend? It could add some mad growl whilst you keep your bottom end.Anonymoushttps://www.blogger.com/profile/09423619749260980539noreply@blogger.com