tag:blogger.com,1999:blog-6847048658257278783.post2266341302328262122..comments2024-03-29T01:36:12.851+00:00Comments on Guitar FX Layouts: DOD Overdrive Preamp 250IvIarkhttp://www.blogger.com/profile/08416945174853142251noreply@blogger.comBlogger43125tag:blogger.com,1999:blog-6847048658257278783.post-92102725391398270732022-09-02T17:20:39.441+01:002022-09-02T17:20:39.441+01:00No, you are correct! It supposedly makes no differ...No, you are correct! It supposedly makes no difference, as the components are in series.Werther Ellerbrockhttps://www.blogger.com/profile/09026155957275840166noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-5661710843727085022021-08-31T16:16:31.510+01:002021-08-31T16:16:31.510+01:00Build this with vintage parts ..Sounds exactly gre...Build this with vintage parts ..Sounds exactly grey version<br />Thank you and credits to the owners of this site..Damianhttps://www.blogger.com/profile/09620361977224666570noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-51030799267918932422021-08-04T12:01:58.444+01:002021-08-04T12:01:58.444+01:00Super!!
My DOD250:
https://www.tiktok.com/@zsoli6...Super!!<br />My DOD250:<br /><br />https://www.tiktok.com/@zsoli68/video/6992275049050819845?lang=hu-HU&is_copy_url=0&is_from_webapp=v1&sender_device=pc&sender_web_id=6974061748027491845zsolihttps://www.blogger.com/profile/06445666894161354551noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-2272514154878190082021-06-07T02:22:34.576+01:002021-06-07T02:22:34.576+01:00My GAIN pot is reversed. How do I fix it?My GAIN pot is reversed. How do I fix it?Celiohttps://www.blogger.com/profile/15492139550832925543noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-55344020077733872912021-04-09T21:46:55.229+01:002021-04-09T21:46:55.229+01:00This comment has been removed by the author.Juanhttps://www.blogger.com/profile/17720478691540587669noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-26849669205243156962021-04-09T21:45:05.426+01:002021-04-09T21:45:05.426+01:00Hi! 6 years later I present the same problem. I...Hi! 6 years later I present the same problem. I'm new to this and the truth is I don't know what happens, everything is in its place and I tried to do my best but I don't get the overdrive, my guitar straight without any modification in the signal.How did you manage to fix it?Juanhttps://www.blogger.com/profile/17720478691540587669noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-76388605633022272222021-04-02T12:57:30.082+01:002021-04-02T12:57:30.082+01:00This comment has been removed by the author.rjhttps://www.blogger.com/profile/11573076165367852166noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-90419793270462016362021-01-08T04:04:47.642+00:002021-01-08T04:04:47.642+00:00Verified using UA741CP opamp. 1n4148 diodes sound ...Verified using UA741CP opamp. 1n4148 diodes sound great, classic, like a DOD 250 should. Red 3mm LED are an interesting tonal option - try putting both on a switch.<br /><br />Also, I found that the logarithmic 500k pot didn't work for me. First 3/4 of the rotation had no overdrive effect, then it spiked up at the end. Way better with a linear B500k potentiometer. Remember to swap the connection or the gain's sweep will be reversed. Just wire the board to Gain 1 and 2 instead of 2 and 3.Clydicushttps://www.blogger.com/profile/13442885111842726395noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-15943544578052224492020-09-14T09:01:02.901+01:002020-09-14T09:01:02.901+01:00Thank you kizzer....
Thank you kizzer....<br />Franckhttps://www.blogger.com/profile/01253129274579607963noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-51032783057788614482020-09-13T11:29:53.202+01:002020-09-13T11:29:53.202+01:002 links in the same hole.2 links in the same hole.kizzerhttps://www.blogger.com/profile/12086303815460403356noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-6787705488002242472020-09-13T03:15:25.317+01:002020-09-13T03:15:25.317+01:00It may have been asked before, what is the blue do...It may have been asked before, what is the blue dot under the IC.Franckhttps://www.blogger.com/profile/01253129274579607963noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-25009541939678460002019-11-06T14:52:21.421+00:002019-11-06T14:52:21.421+00:00The rationale behind this circuit is that increasi...The rationale behind this circuit is that increasing the gain also adds more high end, so a real tone control is not really part of the design.<br /><br />You can try the modification that Brian Wampler suggested for the Distortion+, which should also work with this circuit: Replace the 1nF capacitor with a 2.2nF cap in series with a 1M pot, see: https://www.premierguitar.com/articles/mxr-distortion-plus-mods-1h-prhttps://www.blogger.com/profile/15063105957660587269noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-5184271727324866722019-09-21T14:26:50.611+01:002019-09-21T14:26:50.611+01:00Is there a simple tone pot add-on or treble roll o...Is there a simple tone pot add-on or treble roll off that can be done? cringehttps://www.blogger.com/profile/04531687385764665589noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-57434914695529090272019-02-28T14:52:07.592+00:002019-02-28T14:52:07.592+00:00My first ever build! Sounds great. Admittedly didn...My first ever build! Sounds great. Admittedly didn't work first time and had to do some trouble-shooting (my soldering skills are... less than adequate), but now that it's up and running I've been experimenting with the diodes, which I socketed. The stock 1n4148s sound great, but I tried a pair of BAT42s as well, which were recommended in a comment here. Different flavour definitely, slightly less output I think, but a slightly fuller bass and low mid presence. I decided to put one 1n4148 and one BAT42 to see what it sounded like, and so far that's what I'm sticking with until a pair of germanium 1n34a diodes arrive and I can try those out.<br />Cheers!CanOfCandidhttps://www.blogger.com/profile/07611638282116933971noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-20442176846672194302018-10-11T23:35:25.650+01:002018-10-11T23:35:25.650+01:00This comment has been removed by the author.903 Effectshttps://www.blogger.com/profile/12247389939686891680noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-8179227720959208132017-02-07T17:07:39.457+00:002017-02-07T17:07:39.457+00:00ooops- decimal point...(.) make that read - the .0...ooops- decimal point...(.) make that read - the .01 to the .015 on the input.Anonymoushttps://www.blogger.com/profile/13083970788710738695noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-60744901848379917042017-02-07T17:04:44.197+00:002017-02-07T17:04:44.197+00:00I built it yesterday with a 1M gain and TLO71. Sou...I built it yesterday with a 1M gain and TLO71. Sounds good. Low noise for such a simple creature of clipped gain. I moved the 4.7uf cap into it's stock position- in front of the 10k output filter resistor. Could not find a .001uf in my stash so I used a .0015uf for an input cap, seems fine. Waiting on a C500k and a LM741 from a supplier in Oklahoma. Rigging mine for LEDs, 4148's and a pair of mosfet clippers. Thanks for a great layout!Anonymoushttps://www.blogger.com/profile/13083970788710738695noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-33316761946028216102016-08-18T08:42:55.864+01:002016-08-18T08:42:55.864+01:00I just finished one with 3mm red LED clipping diod...I just finished one with 3mm red LED clipping diodes and the lm741 <br /><br />sounds fantastic for a preamp! Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-22830358693472530622016-02-07T20:58:28.186+00:002016-02-07T20:58:28.186+00:00Another one I got built and tested over the weeken...Another one I got built and tested over the weekend, used an LM741 and there's plenty of gain on tap, though I'll probably try a few alternatives at some point just to see which I like the best. At minimum gain it never gets completely clean, more a gritty edge of breakup sound even on a clean amp but into a slightly driven amp there is plenty of scope for playing dynamics and the guitars volume control to clean things up a bit if the mood takes you. Pretty good classic rock style overdrive and will probably get boxed at some point :o)Pavloshttps://www.blogger.com/profile/01014262540021503034noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-14740765455601994922015-05-17T03:31:36.662+01:002015-05-17T03:31:36.662+01:00Hi, I've only built a few pedals and still con...Hi, I've only built a few pedals and still consider myself new at this. I have tried to build this one and seem to have similar problems to others. Instead of nice distortion, there is a crackling like noise when the gain is turned up high enough that the IC begins to clip. Even with the clipping diodes removed, it still makes this noise when the gain is turned up.<br /><br />I tested all the parts before the build and everything was within reason. Most of the parts are socketed and I've checked the caps again, they all check out. Also, I've tried about 10 different LM741CN opamps as well at 4 different TL071 and they all make the same noise. I've changed the cap on the feedback loop between pin 2 to 6 from 10pf, 20pf, 47pf, 100pf, and 120pf, all have the same noise.<br /><br />Here are my voltages:<br /><br />1: 0<br />2: 4.24<br />3: 3.03<br />4: 0<br />5: 0<br />6: 4.54<br />7 9.01<br />8 0<br /><br />I've made an audio probe and the signal is clear up until it comes out of the IC at pin 6.<br /><br />Images:<br /><br />http://1drv.ms/1JoRYYO<br />http://1drv.ms/1JoS3Md<br />http://1drv.ms/1A6U1ic<br />http://1drv.ms/1A6U7Xj<br />http://1drv.ms/1JoSmGP<br />http://1drv.ms/1JoSrKp<br />http://1drv.ms/1JoSuWS<br />http://1drv.ms/1JoSCpa<br /><br />Any help would be appreciated.Anonymoushttps://www.blogger.com/profile/04180567906633188003noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-35107195424960075352015-04-24T04:04:23.436+01:002015-04-24T04:04:23.436+01:00Does it sound correct when the gain pot isn't ...Does it sound correct when the gain pot isn't maxed?Carpe DMhttps://www.blogger.com/profile/16098942316841023172noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-44703349372381707062015-04-23T16:54:37.318+01:002015-04-23T16:54:37.318+01:00Hello, this one is my first and when is the gain p...Hello, this one is my first and when is the gain pot at its maximum, it makes lot of crapy noise. Coulde anyone help me, please?<br />Anonymoushttps://www.blogger.com/profile/15162074452006657386noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-5759795234370642942015-03-25T19:07:10.190+00:002015-03-25T19:07:10.190+00:00Looking at this layout, it appears that IC pin 6 g...Looking at this layout, it appears that IC pin 6 goes into a 10k resistor, which goes into a 4.7uF cap. Other schems I've seen swap it so that the cap comes before the resistor.<br /><br />Am I going crazy?Anonymoushttps://www.blogger.com/profile/05745646525877007253noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-77610707293626876632015-03-10T15:40:39.733+00:002015-03-10T15:40:39.733+00:00Thanks for the immediate response Warrior.
I finis...Thanks for the immediate response Warrior.<br />I finished but something isn't working. My guitar signal travels unaltered through the circuit no matter the position of the switch. Do you have any general idea what might be the problem?<br />Thanks againAnonymoushttps://www.blogger.com/profile/04939230742982003685noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-2302454159891547422015-03-10T11:34:32.373+00:002015-03-10T11:34:32.373+00:00Just leave it unconnected ;)Just leave it unconnected ;)Warriorhttps://www.blogger.com/profile/18361603526568426561noreply@blogger.com