tag:blogger.com,1999:blog-5481402030233340127.post161786683818040882..comments2024-03-28T17:24:07.520-04:00Comments on Perf and PCB Effects Layouts: JHS Twin Twelve V1dtgehringhttp://www.blogger.com/profile/09555201436004501222noreply@blogger.comBlogger30125tag:blogger.com,1999:blog-5481402030233340127.post-6513321546829716492022-02-08T16:53:45.356-05:002022-02-08T16:53:45.356-05:00Hi! Thank you for the improvements! regarding the ...Hi! Thank you for the improvements! regarding the Bass pot it should changed both 100k to 1K (from lug 2 and 3) or from which lug should change to 1k ? thanks a lot in advance!Anonymoushttps://www.blogger.com/profile/16270295358016696082noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-41729711511915848902022-01-10T05:58:23.169-05:002022-01-10T05:58:23.169-05:00You need to have this capacitors and diodes in pow...You need to have this capacitors and diodes in power supply section.Szlasthttps://www.blogger.com/profile/16184451986913237097noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-70693505538306740452022-01-10T05:57:22.955-05:002022-01-10T05:57:22.955-05:00Hi! Me once again. I built it one more time and Ba...Hi! Me once again. I built it one more time and Bass and Treble works better with 1m linear. Sorry for misleading. To have Bass range like in JHS you need to replace resistors connected to Bass pot 68k with 27k and 10k with 1k (original pedal has this values there).Szlasthttps://www.blogger.com/profile/16184451986913237097noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-83009260911876333422021-10-20T16:18:32.159-04:002021-10-20T16:18:32.159-04:00Hi, I builded this pedal without charge pump using...Hi, I builded this pedal without charge pump using 18V power supply and it does'nt work at all. I excluded 2 10uf caps and 2 5817 diodes which I replaced with jumpers. I checked every solder joint, connections, bridges, components orientation, etc... I also checked my JFETs and they are okay. Im only getting volt reading from bottom right trimmer. It only makes like 18v hiss noise or whatever. Please help! Im out of ideas.Anonymoushttps://www.blogger.com/profile/02500511604507979074noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-40076651174468571022021-03-23T07:27:20.779-04:002021-03-23T07:27:20.779-04:00Hi, I just built and sounds great! My remarks belo...Hi, I just built and sounds great! My remarks below:<br />- this pedal is very sensitive for quality of power supply and charge pump 7600S was squealing and when I put there MAX1044 original one was fine besides low frequency noise which I removed by connecting better quality separate power supply. Maybe it would be good idea to make new layout where charge pump section is moved a bit from j201 and rest of components as it is in JHS Twin Twelve pedal. <br />- I replaced EQ pots linear 1m to logarithmic 1m as it is in original Silvertone amp. You can simulate this EQ section in online app http://www.guitarscience.net/tsc/james.htm and see difference between this two pot characteristics. <br />- Bass control seams to be weak but it's very similar to demo made by Pete Thorn about JHS Twin Twelve. To increase range you can lower value of 68k resistor connected to 1 pin of bass potentiometer, but all EQ components are identical as it is in original Silvertone amp.<br />- I had to put bigger value than 100k trimmer nearest charge pump to be able to go lower than 10V.Szlasthttps://www.blogger.com/profile/16184451986913237097noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-37142410330927668792019-09-27T18:46:11.944-04:002019-09-27T18:46:11.944-04:00Just finished this. Sounds great. Had an issue wit...Just finished this. Sounds great. Had an issue with the MAX1044, just squealed constantly then started smoking and fried itself. Biased to 9v. Replaced with LT1054 and works straight awayDueyhttps://www.blogger.com/profile/02523038564634123328noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-87325527509333015542018-11-12T08:59:37.403-05:002018-11-12T08:59:37.403-05:00Hello folks, i have built this pedali sounds nice,...Hello folks, i have built this pedali sounds nice, used smd j201 fets, checked them , all in specs. I used multiple turn trimpots, shielded cables, branded caps etc. BUT, it's really noisy, i was suspicious about my guitar, so i pluuged a clean signal source, still the same, i excluded the charge pump too, still the same noise, i checked my pots, all okay, they are alpha pots, also im using 9v battery to eliminate wall adapter related noise. Tried to play around with bias voltage, same issues. Checked the soldering, bridges, faulty caps etc. I'm out of ideas any suggestions to make it less noisy? It produces noise even guitar volume is 0.Simurghhttps://www.blogger.com/profile/08660039169033063088noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-78927840834417229962018-05-07T09:15:51.947-04:002018-05-07T09:15:51.947-04:00hi ! It's verified with the update ;)
Very ni...hi ! It's verified with the update ;) <br />Very nice sounding, but first stage gain is a bit noisy, , anyone have an idea to solve it ? Simonhttps://www.blogger.com/profile/11238699685611928272noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-81240827067548730952018-05-01T19:12:51.878-04:002018-05-01T19:12:51.878-04:00Hi, I built it but bass is not working properly. I...Hi, I built it but bass is not working properly. It is too weak and bass pot doesn't help much either.Anonymoushttps://www.blogger.com/profile/13057398351722100729noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-55472966673314574452018-03-18T05:07:38.291-04:002018-03-18T05:07:38.291-04:00Hello, I'm trying to bias the j201s but the tr...Hello, I'm trying to bias the j201s but the trimmers just seem to be ruling nothing, the only thing I can do is going from 17.5 to 17, it doesn't go lower than that. What could be wrong? Thanks againAnonymoushttps://www.blogger.com/profile/04632197073901135280noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-52365152767118839772017-11-05T00:02:36.066-04:002017-11-05T00:02:36.066-04:00It's has been updated. See above.It's has been updated. See above.Effects Layoutshttps://www.blogger.com/profile/11341183658959824998noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-58486802565518048822017-11-04T15:51:45.885-04:002017-11-04T15:51:45.885-04:00Hello coul you please post the corrected version? ...Hello coul you please post the corrected version? Thanks in advance!Anonymoushttps://www.blogger.com/profile/04632197073901135280noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-8497904139141639872017-10-30T10:45:19.915-04:002017-10-30T10:45:19.915-04:00Finally got around to fixing it. Should be all goo...Finally got around to fixing it. Should be all good now.Effects Layoutshttps://www.blogger.com/profile/11341183658959824998noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-73343275619711566862017-10-30T10:44:49.821-04:002017-10-30T10:44:49.821-04:00It's not confirmed if this is the circuit JHS ...It's not confirmed if this is the circuit JHS used, but at the very least it's a very well educated guess. It's close enough for me. YMMVEffects Layoutshttps://www.blogger.com/profile/11341183658959824998noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-73055348940032895972017-10-28T00:30:20.231-04:002017-10-28T00:30:20.231-04:00Is there any proof that this is the real JHS Twin ...Is there any proof that this is the real JHS Twin Twelve schematic?<br /><br />The schematic that you linked to comes from the TagboardEffects forum. If you do a search for "Silvertone," it's the thread titled "Silvertone 1485/Twin Twelve." That thread traces back to a post on freestompboxes.org titled "eighty seven percent - De Stijl."<br /><br />That circuit is an individual's attempt at doing a tube -> FET conversion of a Silvertone amplifier circuit. I have seen no evidence that this is the actual schematic for the JHS Twin Twelve.<br /><br />However, I'm glad to be proven wrong, if someone can provide a source.D.C.https://www.blogger.com/profile/12397149622246312831noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-4201535311651831882017-10-18T07:27:49.302-04:002017-10-18T07:27:49.302-04:00Bump.is it verified? ThanksBump.is it verified? ThanksAnonymoushttps://www.blogger.com/profile/12416958498614980087noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-72284411679189799402017-09-28T10:11:36.193-04:002017-09-28T10:11:36.193-04:00Hi, is it verified?. Thanks!!Hi, is it verified?. Thanks!!Anibal Báezhttps://www.blogger.com/profile/05235271478262133779noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-45592150980397933602017-08-23T15:59:42.165-04:002017-08-23T15:59:42.165-04:00Actually T-Funk spot it first :
I think the 10uF c...Actually T-Funk spot it first :<br />I think the 10uF closest to Q2 should be connected to the strip side of the other 5817 diode (I think this is what happens in your superbolt layout and what the 1044 data sheet says). As drawn above I think the IC chip heats up and dies pretty quick. Edohttps://www.blogger.com/profile/03846901813544772682noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-32998065149350372802017-08-23T09:27:49.468-04:002017-08-23T09:27:49.468-04:00Clarify for me what's wrong with the charge pu...Clarify for me what's wrong with the charge pump. Either I'm having major brain farts or the schematic I used is wrong. hahaEffects Layoutshttps://www.blogger.com/profile/11341183658959824998noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-82376490656402736432017-08-23T07:32:31.111-04:002017-08-23T07:32:31.111-04:00Done! Except error in the charge pump section its ...Done! Except error in the charge pump section its verified. Nice one dude 🤘Edohttps://www.blogger.com/profile/03846901813544772682noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-54713707584932629152017-08-22T12:04:33.149-04:002017-08-22T12:04:33.149-04:00Yes, same with T-funk, the charge pump section is ...Yes, same with T-funk, the charge pump section is wrong. Now the charge pump section is working, and try to build the restEdohttps://www.blogger.com/profile/03846901813544772682noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-22646436492788454052017-08-20T23:16:14.699-04:002017-08-20T23:16:14.699-04:00So, is it verified now?So, is it verified now?Edohttps://www.blogger.com/profile/03846901813544772682noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-74510132475608206872017-08-17T17:03:45.890-04:002017-08-17T17:03:45.890-04:00I have this populated on my bench right now.....an...I have this populated on my bench right now.....and it is not quite working. I think the 10uF closest to Q2 should be connected to the strip side of the other 5817 diode (I think this is what happens in your superbolt layout and what the 1044 data sheet says). As drawn above I think the IC chip heats up and dies pretty quick. <br /><br />I think something else is still wrong with the power doubler in at least my build though; I can get a pretty clean low output signal out of the effect without the IC in place (biasing the J201's to 4.5v), but when I insert the chip after moving the 10uF cap as I note above (and rebias the transistors) the sounds stops. T-Funkhttps://www.blogger.com/profile/04727090928618027933noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-29944388178068309112017-08-13T21:26:48.912-04:002017-08-13T21:26:48.912-04:00I'll try, thanks!!I'll try, thanks!!Anibal Báezhttps://www.blogger.com/profile/05235271478262133779noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-47709264041011835582017-08-13T21:02:24.775-04:002017-08-13T21:02:24.775-04:00Oh, you'll want to leave pin 1 disconnected wi...Oh, you'll want to leave pin 1 disconnected with the 1054.Effects Layoutshttps://www.blogger.com/profile/11341183658959824998noreply@blogger.com