tag:blogger.com,1999:blog-6847048658257278783.post4701116844157322653..comments2024-03-27T15:26:01.893+00:00Comments on Guitar FX Layouts: DOD Overdrive Preamp 250 ReissueIvIarkhttp://www.blogger.com/profile/08416945174853142251noreply@blogger.comBlogger53125tag:blogger.com,1999:blog-6847048658257278783.post-50851438491650510742019-07-14T08:08:59.351+01:002019-07-14T08:08:59.351+01:00This pedal sounds great (tele bridge vintage pup i...This pedal sounds great (tele bridge vintage pup into my Yamaha THR10C (Deluxe Reverb amp sim)). I passed on one of these DOD 250 reissues in a pawn shop so happy to have one hand built. Make sure to use the 500kC rev log pot for gain. Thanks, Mirosol!Anonymoushttps://www.blogger.com/profile/15075336289445494714noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-48360645261546332632017-10-30T12:58:54.076+00:002017-10-30T12:58:54.076+00:00I'm looking for some mods to make it more bass...I'm looking for some mods to make it more bass friendly. <br />I've build the Grey version with a input cab blend knob (10uf-200pf) But the sound didn't change too much. And even all the way to 10uf, the bass was still cut out. <br /><br />So i want to try the reissue, but how can i make it so all the low-end is still present? And preferably, make a nice tone control.Anonymoushttps://www.blogger.com/profile/08394467292419542457noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-70295393396254625852015-05-13T15:19:53.827+01:002015-05-13T15:19:53.827+01:00The photos are here:
http://migre.me/pQh5S
http:...The photos are here:<br /><br />http://migre.me/pQh5S<br /><br />http://migre.me/pQh2v<br /><br />http://migre.me/pQh3k<br /><br />http://migre.me/pQh43<br /><br />http://migre.me/pQh4E<br /><br />http://migre.me/pQh5i<br /><br />Anonymoushttps://www.blogger.com/profile/08273791556005360699noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-5930831298703025842015-05-13T15:09:43.823+01:002015-05-13T15:09:43.823+01:00Hello,
I will upload some photos.
Thank youHello,<br /><br />I will upload some photos.<br /><br />Thank youAnonymoushttps://www.blogger.com/profile/08273791556005360699noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-20463156159543445662015-04-18T09:19:52.296+01:002015-04-18T09:19:52.296+01:00yes i have had the same problem, the gain pot does...yes i have had the same problem, the gain pot doesn't change anything. i tried flipping to see if maybe that other schematic was right, but then i got no sound. Anonymoushttps://www.blogger.com/profile/06962314000395220016noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-30174211895006761912015-04-07T22:32:57.977+01:002015-04-07T22:32:57.977+01:00With the exception of the input cap...100n here an...With the exception of the input cap...100n here and 10n in your linked schematic...the layout is exactly per schematic. It may be worth taking some hi res photos of your board front, back and off board wiring and upload to a photo sharing site. Fresh pair of eyes couldn't hurt.Ciaran Hasletthttps://www.blogger.com/profile/14841971807120256954noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-80383010433989491382015-04-07T15:47:05.066+01:002015-04-07T15:47:05.066+01:00I made the circuit again with new components and n...I made the circuit again with new components and new board... I had the same problem... Only the level knob works...Anonymoushttps://www.blogger.com/profile/09885311400121949922noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-59034069423909670432015-04-06T16:47:37.371+01:002015-04-06T16:47:37.371+01:00Hello Charles,
Thank you for answer me.
What sc...Hello Charles, <br /><br />Thank you for answer me.<br /><br />What schematic are you talking about ??The Tagboardeffects layout or from this site: http://img4.hostingpics.net/pics/514256DOD250BG.jpg<br /><br />Did you already construct it ?Anonymoushttps://www.blogger.com/profile/08273791556005360699noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-17538169888141515472015-04-06T07:51:57.495+01:002015-04-06T07:51:57.495+01:00It seems that schematic is wrong. The gain pot is ...It seems that schematic is wrong. The gain pot is the wrong way around I think.Anonymoushttps://www.blogger.com/profile/06201678011261105677noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-83402535440414179642015-04-06T02:55:09.668+01:002015-04-06T02:55:09.668+01:00If you compare the schematic with this layout, it ...If you compare the schematic with this layout, it can be seen some differences in the Pot connections.<br /><br />http://img4.hostingpics.net/pics/514256DOD250BG.jpg<br /><br />For example, <br /><br />In the scheme of this website, the Gain pot 1 and 2 goes to Ground. The Gain pot 3 goes to the 4k7 resistor.<br /><br />Anybody did have this kind of problem ?<br /><br /><br />thank you<br /><br />Anonymoushttps://www.blogger.com/profile/09885311400121949922noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-52692994485064761902015-04-06T01:49:22.891+01:002015-04-06T01:49:22.891+01:00I made this circuit and only the Volume pot worked...I made this circuit and only the Volume pot worked. The Gain pot (500k rev log) did not express any kind of sound or variation on the sound :(<br />I thought the error could be the Gain 1 and 2 to the 4K7 resistor and Gain 3 to ground but the first question of this topic said that was in the right place. Now I do not know what to do. Anonymoushttps://www.blogger.com/profile/09885311400121949922noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-82057450813935628332014-07-14T10:04:29.361+01:002014-07-14T10:04:29.361+01:00tnx mirosol...
I'm searching some stores that ...tnx mirosol...<br />I'm searching some stores that maybe I could find the rev log pots...<br />tnx for helps :)Captain Jack Sparrowhttps://www.blogger.com/profile/17552882923049023614noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-7889399233033447772014-07-12T18:50:17.712+01:002014-07-12T18:50:17.712+01:00Yes you can. And it will have all the same setting...Yes you can. And it will have all the same settings on its sweep. Just in different locations of the turn. http://www.geofex.com/Article_Folders/potsecrets/potscret.htm<br />There are ways to tweak the tapers as written on that article - but in this case it won't work as there'll be only two of the lugs in effective use. For all OD250 versions and its derivatives, it's always reverse log that gives the sensible control.<br /><br />You could try 200K linear pot instead, but that will lose a lot of the lower settings. Or you could try ordering pots from Tayda. They ship worldwide.<br />http://www.taydaelectronics.com/potentiometer-variable-resistors/rotary-potentiometer/anti-log-reverse/500k-ohm-c500k-500kc-anti-log-taper-potentiometer.html<br />+mmirosolhttps://www.blogger.com/profile/02400327798106357876noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-58636283858742864602014-07-12T16:22:24.141+01:002014-07-12T16:22:24.141+01:00is there a way building this circuit with linear p...is there a way building this circuit with linear pot?<br />I thought that the linear pot can be use instead of the logarithmic :(Captain Jack Sparrowhttps://www.blogger.com/profile/17552882923049023614noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-9919531551472447782014-07-12T16:07:32.207+01:002014-07-12T16:07:32.207+01:00Then your gain knob is working as it should. The c...Then your gain knob is working as it should. The circuit needs reverse logarithmic for gain control to have the entire sweep usable.<br />+mmirosolhttps://www.blogger.com/profile/02400327798106357876noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-1781394799356293122014-07-12T15:25:49.098+01:002014-07-12T15:25:49.098+01:00in my country I can find just LINEAR pot...so I us...in my country I can find just LINEAR pot...so I used linear for the gain...Captain Jack Sparrowhttps://www.blogger.com/profile/17552882923049023614noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-71007390761336301472014-07-12T15:15:57.601+01:002014-07-12T15:15:57.601+01:00http://www.diystompboxes.com/pedals/debug.html
Ar...http://www.diystompboxes.com/pedals/debug.html<br /><br />Are you using rev log pot for the gain?<br />+mmirosolhttps://www.blogger.com/profile/02400327798106357876noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-10737430875420829242014-07-12T13:56:37.671+01:002014-07-12T13:56:37.671+01:00no I didn't...how I can do that?
but what woul...no I didn't...how I can do that?<br />but what would cause that the gain works just between 3 o'clock and 6 o'clock?!!<br />I also replace the gain potentiometer with a new one but still the same...<br />sorry for my bad english...Captain Jack Sparrowhttps://www.blogger.com/profile/17552882923049023614noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-39531656133446583572014-07-12T13:28:43.249+01:002014-07-12T13:28:43.249+01:00Have you tried probing it to see where the signal ...Have you tried probing it to see where the signal dies?<br />+mmirosolhttps://www.blogger.com/profile/02400327798106357876noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-19272085789335366552014-07-12T11:35:41.976+01:002014-07-12T11:35:41.976+01:00I checked the 100R resistor and resolder that and ...I checked the 100R resistor and resolder that and now the voltages via 100R and 22K changed to 8.05V but still the problem exists!!!Captain Jack Sparrowhttps://www.blogger.com/profile/17552882923049023614noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-30745070118068260282014-07-11T16:01:47.439+01:002014-07-11T16:01:47.439+01:00Image shows that you're having 0V at pin 8 of ...Image shows that you're having 0V at pin 8 of the opamp. That's where you need to have the supply voltage via the 100R resistor.<br />+mmirosolhttps://www.blogger.com/profile/02400327798106357876noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-68633546953766361202014-07-11T15:48:05.878+01:002014-07-11T15:48:05.878+01:00Hi mirosol...
this is the voltages of the other pa...Hi mirosol...<br />this is the voltages of the other parts of circuit...<br />plz check link below:<br /><br />https://www.sendspace.com/file/syl30p<br /><br />the voltages of pins of IC from second circuit that I built is same as first one... Captain Jack Sparrowhttps://www.blogger.com/profile/17552882923049023614noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-68106488237260728352014-07-09T17:55:36.627+01:002014-07-09T17:55:36.627+01:00You must have some error on both your builds. The ...You must have some error on both your builds. The voltages are not too bad though. How about the voltages on the other circuit?<br /><br />I've built at least 4 of these circuits myself without an issue..<br />+mmirosolhttps://www.blogger.com/profile/02400327798106357876noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-3553351157888598562014-07-09T08:19:12.847+01:002014-07-09T08:19:12.847+01:00Hi mirosol...
I built two of this pedal...
the fir...Hi mirosol...<br />I built two of this pedal...<br />the first one works but the gain just changes between 3 o'clock and 6 o'clock and before 3 o'clock just the treble of sound decreases and the bass increases...it doesn't sound well...<br />the voltages of IC pins is:<br /><br />1- 4.11v<br />2- 3.98v<br />3- 3.79v<br />4- 0.0v<br />5- 7.54v<br />6- 0.0v<br />7- 7.55v<br />8- 8.05v<br /><br />the second one I've build doesn't work at all...Captain Jack Sparrowhttps://www.blogger.com/profile/17552882923049023614noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-86567000117530837462014-06-11T15:22:05.785+01:002014-06-11T15:22:05.785+01:00That should work just fine.
+mThat should work just fine.<br />+mmirosolhttps://www.blogger.com/profile/02400327798106357876noreply@blogger.com