tag:blogger.com,1999:blog-5481402030233340127.post6528610443097916681..comments2024-03-28T01:15:58.057-04:00Comments on Perf and PCB Effects Layouts: Shin Ei OB-28 Octave Boxdtgehringhttp://www.blogger.com/profile/09555201436004501222noreply@blogger.comBlogger20125tag:blogger.com,1999:blog-5481402030233340127.post-43657789328792134602023-08-03T07:34:42.221-04:002023-08-03T07:34:42.221-04:00https://www.parasitstudio.se/u235.html I made this...https://www.parasitstudio.se/u235.html I made this pedal, but there is distortion in the sound cut and some noise. What is the problem?08escxhttps://www.blogger.com/profile/12728124378822007609noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-20523687303484619962020-07-29T17:52:00.281-04:002020-07-29T17:52:00.281-04:00There is an error with both the perf and PCB versi...There is an error with both the perf and PCB versions. A 100K resistor that should be connected between Q9 collector and Q10 base is missing. The effect works correctly when a 100K resistor is installed and a wire link between terminals 2 and 4 of SwB is also installed.Slowpoke101https://www.blogger.com/profile/17673023735192176565noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-12759202387595341502020-04-13T16:51:11.767-04:002020-04-13T16:51:11.767-04:00I bread-boarded the circuit. Used 6n8 (6.8nF) capa...I bread-boarded the circuit. Used 6n8 (6.8nF) capacitors - the 6u8 is a misprint. Diodes used were 1N4148. The circuit works but I have not made the PCB yet. From your google-drive I used your wiring diagram but I found one problem. There is supposed to be a wire link on SwB linking terminals 2 and 4. <br />Slowpoke101https://www.blogger.com/profile/17673023735192176565noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-20908537750343745622019-01-20T18:52:28.474-05:002019-01-20T18:52:28.474-05:00is this verified?is this verified?Anonymoushttps://www.blogger.com/profile/17454013601397427228noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-53356299120223360472016-10-28T09:19:13.855-04:002016-10-28T09:19:13.855-04:00Replaced 6.8 caps with sockets, tried different co...Replaced 6.8 caps with sockets, tried different combinations - even no clicks became heard, only q1's and q6's collectors give a voice. Most schematics, including factory, have 6,8s all in nF. I have even no idea, what's wrong...Alex Volskyhttps://www.blogger.com/profile/17896754162784672624noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-45269593964049260282016-10-27T09:30:36.743-04:002016-10-27T09:30:36.743-04:00I found another schematic that has all those 6.8 c...I found another schematic that has all those 6.8 caps as uF, not nF. So go ahead and try replacing 3 6.8nF caps in the layout with 6.8uF caps.Effects Layoutshttps://www.blogger.com/profile/11341183658959824998noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-21167464897201512402016-10-27T09:26:57.269-04:002016-10-27T09:26:57.269-04:00That would probably be a mistake on my part. Try r...That would probably be a mistake on my part. Try replacing those caps and see if it fires up. Effects Layoutshttps://www.blogger.com/profile/11341183658959824998noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-139705633205640642016-10-27T07:05:23.312-04:002016-10-27T07:05:23.312-04:00Ok, i found one my idiot mistake - I soldered the ...Ok, i found one my idiot mistake - I soldered the 100n capacitor intead of 2,2k resistor. <br />After replacement bypass mode started to work, but when i turn on the switch A, istead of notes i hear only indistinct clicks, swB just increses hum a little and alone makes even no clicks, how with swA; turning swB off to bypass (when only B turned on) makes a not quiet click.<br />Checking the cucuit with audio probe (main effect part), the blue point and all the signal way before produces any kind of fuzz, but then, after 100k resistor (red point and line), isntead of notes are heard clicks like when swA is on.<br />Also capasitors marked yellou are 6,8uf, but your layout has them 6,8nf - is it a mistake? <br />https://drive.google.com/file/d/0B-yOZ9M95dxrSzB1eFMydmlkNWM/view?usp=sharingAlex Volskyhttps://www.blogger.com/profile/17896754162784672624noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-70992056285199491792016-10-25T12:09:50.728-04:002016-10-25T12:09:50.728-04:00It looks like you've got it right. Here's ...It looks like you've got it right. Here's the original schematic I laid this out from.<br /><br />http://www.tremolo.pl/Efekty/Octaver/Octave%20Box.gif<br /><br />Have you tried using an audio probe on it?<br /><br />http://www.diystompboxes.com/pedals/debug.htmlEffects Layoutshttps://www.blogger.com/profile/11341183658959824998noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-21806774221667917282016-10-25T09:09:44.257-04:002016-10-25T09:09:44.257-04:00Need your help, reallyNeed your help, reallyAlex Volskyhttps://www.blogger.com/profile/17896754162784672624noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-77117060750020837062016-10-23T08:00:31.186-04:002016-10-23T08:00:31.186-04:00It just doesn't work wiring like that, and i h...It just doesn't work wiring like that, and i have no idea, what is wrongAlex Volskyhttps://www.blogger.com/profile/17896754162784672624noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-54403847930581910652016-10-21T12:45:12.162-04:002016-10-21T12:45:12.162-04:00Hi again, is it right wiring? https://drive.google...Hi again, is it right wiring? https://drive.google.com/file/d/0B-yOZ9M95dxrV1ZkTnRYRXRsZTA/view?usp=sharingAlex Volskyhttps://www.blogger.com/profile/17896754162784672624noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-41933008412657256572016-08-27T09:50:27.510-04:002016-08-27T09:50:27.510-04:00Those letters refer to the Hfe ranges. A is lower ...Those letters refer to the Hfe ranges. A is lower gain than B, B lower than C. You'll have to compare datasheets to find which is the best replacement. But I would guess B or C will work fine. Effects Layoutshttps://www.blogger.com/profile/11341183658959824998noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-13505472864386394412016-08-27T07:21:32.845-04:002016-08-27T07:21:32.845-04:00Hi, I found bc547 and 557 with letters A, B and C ...Hi, I found bc547 and 557 with letters A, B and C (bc547A, bc557B and so on...). That defines different hfe. So does it matter to choose BCs with hfe close to original 2SCs or with same letters?Alex Volskyhttps://www.blogger.com/profile/17896754162784672624noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-61101280726496421652015-09-03T09:26:08.000-04:002015-09-03T09:26:08.000-04:00SH-1 will probably be pretty hard to source. They ...SH-1 will probably be pretty hard to source. They were just silicon rectifier diodes though, so 1N4001s or similar will probably work fine.dtgehringhttps://www.blogger.com/profile/09555201436004501222noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-38754340733319861802015-09-03T07:54:50.055-04:002015-09-03T07:54:50.055-04:00Check out this link: http://www.learningaboutelect...Check out this link: http://www.learningaboutelectronics.com/images/DPDT-toggle-switch-diagram.png<br /><br />There will be two different DPDT switches on this layout. SwA is one, SwB is the other.<br /><br />Follow the numbering as stated in that link. :)Anonymoushttps://www.blogger.com/profile/06201678011261105677noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-16864952500675012962015-09-03T07:53:12.220-04:002015-09-03T07:53:12.220-04:00Also read this, it has some interesting info about...Also read this, it has some interesting info about matching Q9 and Q10:<br /><br />http://topopiccione.atspace.com/PJ15ShinEiOctave.htmlAnonymoushttps://www.blogger.com/profile/06201678011261105677noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-67939307631747171692015-09-03T07:52:00.646-04:002015-09-03T07:52:00.646-04:00Hey Carlos! The schematic I found for a similar ci...Hey Carlos! The schematic I found for a similar circuit is here - http://topopiccione.atspace.com/pjimages/ShinEiOctave.sch.jpg<br /><br />It calls for SH-1 diodes.Anonymoushttps://www.blogger.com/profile/06201678011261105677noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-37142406881952241232015-09-02T20:18:26.344-04:002015-09-02T20:18:26.344-04:00Thanks you very much my friend, i have a question,...Thanks you very much my friend, i have a question, the diode 1, 2 & 3 is a germanium, silicon,? <br /><br />Thanks :) CharlsRThttps://www.blogger.com/profile/10763466200250052438noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-81480847759084428452015-09-02T16:37:59.301-04:002015-09-02T16:37:59.301-04:00Can you make a layout of the switches' wiring?...Can you make a layout of the switches' wiring? It will be very usefulAnonymousnoreply@blogger.com