tag:blogger.com,1999:blog-6847048658257278783.post2383526960515738797..comments2024-03-29T01:36:12.851+00:00Comments on Guitar FX Layouts: DAM Drag'n'FlyIvIarkhttp://www.blogger.com/profile/08416945174853142251noreply@blogger.comBlogger39125tag:blogger.com,1999:blog-6847048658257278783.post-15557157393339575582014-08-23T03:26:45.308+01:002014-08-23T03:26:45.308+01:00Today I was helping a friend build one of these fr...Today I was helping a friend build one of these from the "mojo" layout and we came upon a real head-scratcher. The pedal oscillates like crazy unless I physically touch both the germanium transistor case and the and the collector lead. Then it sounds great. I reflowed all the solder joints, checked the pinouts and polarities, searched for solder bridges, and tried different power supplies and outlets and transistors, all to no avail. Any idea what might cause this?Matty Dhttps://www.blogger.com/profile/06077499345386901295noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-57436693012380705352013-08-01T15:05:12.219+01:002013-08-01T15:05:12.219+01:00Not sure if anyone has made the mojo layout but I&...Not sure if anyone has made the mojo layout but I'm not getting a sound from it. I've been over and over it and everything is correct so I'm guessing it was a faulty component but just thought I'd mention in case there was an error on mojo layout.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-2958154574333476882013-05-18T23:04:08.488+01:002013-05-18T23:04:08.488+01:00I finished this one up and it sounds awesome. I ha... I finished this one up and it sounds awesome. I had to roll my own resistor for R5 'teepee d' a 47k & 10k. I used a 22uF for C5. NOS Mullard Tropical fish caps for C3 and and C6 for some mojo and BC / Phillips axial electro's.<br />BC337 for Q1 and a CV7112 for Q2 - I have Q2 collector biased at 4.5v and that seems to sound good to me... also metal film resistors and I did not have a metal film for the 820r so I used a CC type I had laying around :-/<br />Not sure what the bias is suppose to be set at but it is just at the verge of sputter land but tighter... For sure this is a cross between a Vox tonebender and a fuzz face... best of both imo<br />Thanks |V|ark! This one is a keeper!Jimijamhttps://www.blogger.com/profile/04425566931407259771noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-56292732207103425822013-05-10T21:18:04.458+01:002013-05-10T21:18:04.458+01:00 I have an OC140 that is a 118 hFE, I hope that va... I have an OC140 that is a 118 hFE, I hope that value is good enough for this pedal. Also a few BC337 and other NPN Si transistors to test.<br />Waiting on a couple caps and then I will make this one!<br /><br />Thanks IvIark!Jimijamhttps://www.blogger.com/profile/04425566931407259771noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-11847899120743850102013-03-14T21:19:54.320+00:002013-03-14T21:19:54.320+00:00Thank you man!!!Thank you man!!!massdollhttps://www.blogger.com/profile/11674704759038209786noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-1125469922189847392013-03-14T20:39:56.012+00:002013-03-14T20:39:56.012+00:00Yes it's a parallel reverse polarity protectio...Yes it's a parallel reverse polarity protection diode. If you reversed the polarity on that extremely expensive pedal it would blow a hole in the bottom of the board because it isn't fused, so I omit them or use series protection instead sometimes :)IvIarkhttps://www.blogger.com/profile/08416945174853142251noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-67141295559721517492013-03-14T20:13:54.617+00:002013-03-14T20:13:54.617+00:00I listen good tones form this pedal but what is th...I listen good tones form this pedal but what is the diode on the original circuit? http://www.flickr.com/photos/terekhova/4933822855/lightbox/<br /><br />why is not on this layout, it can make diferent sound or is to protect the reverse polarity??<br /><br />Im begginer sorry my noob question :-)massdollhttps://www.blogger.com/profile/11674704759038209786noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-20978976047791519312012-11-30T15:49:33.998+00:002012-11-30T15:49:33.998+00:00Have to retract from my previous words. After a ca...Have to retract from my previous words. After a careful biasing by ear (it finally showed 4,3v on the Q2 collector) and replacing the 100k filter pot (seems that the original one was not totally OK) have to say:<br /><br />This effect is truly awesome, and yeah, it works exactly the same that you can check on youtube demos.<br /><br />Tried it with some AC180 NPN germaniums that I have at home, rated about 90-100 hfe, and the result was not satisfactory, but the OC140 from Mommoth Electronics, really rocks and wakes the beast on this little effect.<br /><br />Really the Meathead and the Drag'N'Fly have been two really socking effects. I LOVE fuzzes, but nothing until I built the Meathead seemed better to me than my classic germanium Fuzz Face (previously with AC128 and now wirh GT308B).... now the Meathead and the Drag'n'Fly are glued to my pedalboard, and the FF and the Fuzz factory are enjoying a long rest :)<br /><br />Will see the Grease Box (I have selected three GT308B for it (60-65-9 hfe), if it sounds just similar to the demos, and having red the Miro's opinion) I think i'll need some extra space on my pb.<br /><br />BR!JaviCAPhttps://www.blogger.com/profile/15831602988871935058noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-45600297921617677562012-11-28T20:23:02.814+00:002012-11-28T20:23:02.814+00:00Well, box was ready, so.... pedal finished!
http:...Well, box was ready, so.... pedal finished!<br /><br />http://img22.imageshack.us/img22/2805/dragnfly.jpg<br /><br />BR!JaviCAPhttps://www.blogger.com/profile/15831602988871935058noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-35811532194524626282012-11-28T13:06:41.579+00:002012-11-28T13:06:41.579+00:00Hehehehehehehe, setting different bias to the germ...Hehehehehehehe, setting different bias to the germanium now, seems to be better when getting 5,5-6 volts on the collector.<br /><br />Will keep on checkin!JaviCAPhttps://www.blogger.com/profile/15831602988871935058noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-55059895910238383742012-11-28T12:52:20.477+00:002012-11-28T12:52:20.477+00:00There was an classic Benny Hill gag; Benny as a te...There was an classic Benny Hill gag; Benny as a teacher wrote to the blackboard: "assume" and said "Don't you ever assume boy! When you do, it makes an Ass out of U and Me!"<br />+mmirosolhttps://www.blogger.com/profile/02400327798106357876noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-41073099960641606992012-11-28T12:22:45.238+00:002012-11-28T12:22:45.238+00:00Hah. True. I didn't take notice of this being ...Hah. True. I didn't take notice of this being negative ground, so my assumption was wrong.<br />+mmirosolhttps://www.blogger.com/profile/02400327798106357876noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-61763258029429779962012-11-28T12:12:33.992+00:002012-11-28T12:12:33.992+00:00Miro, by the way, could not try the AC128, OC140 i...Miro, by the way, could not try the AC128, OC140 is NPN. I tried some AC180 but they're too weak.<br /><br />BRJaviCAPhttps://www.blogger.com/profile/15831602988871935058noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-75922434793412885242012-11-28T12:11:20.865+00:002012-11-28T12:11:20.865+00:00Just built this circuit.
Well, it sounds great, b...Just built this circuit.<br /><br />Well, it sounds great, but as an usual fuzz, so, all knobs kranked up, not many options. Volume an attack work great... in a similar way to a classic Fuzz Face. Attack rom 3 o'clock onwards and controlling it with guitar volume. <br /><br />Filter knob behaviour is not by any means similar to the demos you can see on youtube, when you turn it CCW it starts to sound weak and no musical at all.<br /><br />Built it with a BC337-25 290hfe (tried a BC-337-16 180 hfe and a 2N3904 180 hfe) and a nos OC140 115hfe.<br /><br />Will have to check it more in deep, but I'm a bit frustrated as is no even close to the behaviour I was expecting.<br /><br />BRJaviCAPhttps://www.blogger.com/profile/15831602988871935058noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-91879127638204017022012-11-18T13:20:57.756+00:002012-11-18T13:20:57.756+00:00I'll try the AC128s for sure, but shall order ...I'll try the AC128s for sure, but shall order too an OC140 120hfe, have plenty of time to get it, as I'll build no other pedal in a month or so. <br /><br />Last builts (Klon Centaur, King of Tone, Deep Blue Delay, Triple Wreck and Meathead in an 1590A) have been exhausting so I'll have a break before facing the DAM Fuzzes series :)<br /><br />BRJaviCAPhttps://www.blogger.com/profile/15831602988871935058noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-89972638289464110452012-11-15T15:35:13.601+00:002012-11-15T15:35:13.601+00:00Doesn't cost you too much to try AC128 in it.....Doesn't cost you too much to try AC128 in it... It might sound good or it might not. But as you have those, then build the first one with sockets and try it out.<br /><br />There could be something magical about OC transistors, but personally.. I think that's a myth.<br />+mmirosolhttps://www.blogger.com/profile/02400327798106357876noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-40867129029451593512012-11-15T13:31:25.871+00:002012-11-15T13:31:25.871+00:00*stick to the specification, i mean*stick to the specification, i meanJaviCAPhttps://www.blogger.com/profile/15831602988871935058noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-45484705906315535552012-11-15T13:28:11.593+00:002012-11-15T13:28:11.593+00:00Thanks Miro, I'll check this thread.
Can try...Thanks Miro, I'll check this thread. <br /><br />Can try with an AC 128 (have a copuple hfe 110 at home), but after dealing with Rangemaster clones, I seen that while nearly all pnp AC germaniums cand be replaced by other AC's or even russian o japanese ones with no problem, just a few bias tweaks. <br /><br />But dealing with OC's is not the same in my opinion (Rangemaster example), and if we're talking about a D.A.M. pedal.... . Being a David's creation, if he decided to use an OC140 there must be a reason.<br /><br />If it was another brand, would replace the trannie with no problem, but in this particular case I think will fit the specification :)<br /><br />BRJaviCAPhttps://www.blogger.com/profile/15831602988871935058noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-68830578938370646202012-11-15T10:19:04.309+00:002012-11-15T10:19:04.309+00:00Check this:
http://www.diystompboxes.com/smfforum/...Check this:<br />http://www.diystompboxes.com/smfforum/index.php?topic=83401.0<br /><br />People are saying that ~120-130 hFE could be at the butterzone... You could definitely try something a lot cheaper instead of OC140. You can get tested AC122 or AC128 from musikding for 2,50€.<br />+mmirosolhttps://www.blogger.com/profile/02400327798106357876noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-56080803098098507082012-11-15T09:23:54.407+00:002012-11-15T09:23:54.407+00:00Hi Mark,
Which hfe is recommended for the OC140? ...Hi Mark,<br /><br />Which hfe is recommended for the OC140? This is an expensive trannie, so I'll try to get a checked and hfe selected one. No way buyin' ten unchecked ones at 5 euros each and find that no one works. Prefer pay 9 euros for selected to specs one.<br /><br />BRJaviCAPhttps://www.blogger.com/profile/15831602988871935058noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-45139760458774733632012-04-15T07:11:46.689+01:002012-04-15T07:11:46.689+01:00Works beautifully! Thanks so much for your help! I...Works beautifully! Thanks so much for your help! I had another trimpot that had the correct spacing. What a killer sound. I'll send some photos when she is all painted and full of knobs. Thanks again!Kinskihttps://www.blogger.com/profile/05289368766380894271noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-13368777272378961362012-04-15T03:47:01.725+01:002012-04-15T03:47:01.725+01:00Holy moly, you are right! I never would have seen ...Holy moly, you are right! I never would have seen that. I'm on it...Kinskihttps://www.blogger.com/profile/05289368766380894271noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-42086033925796241662012-04-14T23:55:21.976+01:002012-04-14T23:55:21.976+01:00That's just part of that cap symbol and is sup...That's just part of that cap symbol and is supposed to signify where the lead comes out of the bottom of the cap, there's one at the other side too but it's obscured by the white "-" mark. It's probably unnecessary to even see that in most instances but it is quite useful sometimes to show the pitch of the cap. It's just the two outer connections that matter and so that cap should be between the base and Filter 3 wire.<br /><br />Actually I think I see what the problem is. You've used a trimmer with a 5mm pitch between the two outer pins, but only a 2.5mm pitch up to the wiper instead of 5mm shown in the layout. So at the moment you have the wiper attached to Q2 emitter instead of the row with the 1K resistor and 10n cap. <br /><br />To fix it you'll either have to remove the trimmer and maybe use another one with the wiper bent up and back out again to give you the correct 5mm pitch, or if you don't mind hacking it, put a cut to the right hand side of Q2 emitter (and so separate the emitter from the trimmer wiper) and then put a little link in at the far right hand side between rows 4 and 5. That will make the required connections for you. It may be a bit fiddly to get that cut in because you have solder round there, but if you're careful with a drill bit you should be able to clean that out to break the track.IvIarkhttps://www.blogger.com/profile/08416945174853142251noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-73555974094464544312012-04-14T22:45:17.488+01:002012-04-14T22:45:17.488+01:00Hmmm, okay, one thing I noticed. If you look (rea...Hmmm, okay, one thing I noticed. If you look (really closely!) at the 10uf cap next to Q1, you actually have a blue dot on the positive side of the cap right under where it is placed (in front of C of Q1, and then an additional lead to right in front of B of Q1. Is that correct? Because I just have the two outer connection and not the one next to C of Q1. Hope thats clear!Kinskihttps://www.blogger.com/profile/05289368766380894271noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-56399280938863677382012-04-12T11:13:56.169+01:002012-04-12T11:13:56.169+01:00Excellent, if you take any pics send me the links....Excellent, if you take any pics send me the links. I like to keep a collection of builds done using my layouts. CheersIvIarkhttps://www.blogger.com/profile/08416945174853142251noreply@blogger.com