tag:blogger.com,1999:blog-5481402030233340127.post8768337050038702971..comments2024-03-28T17:24:07.520-04:00Comments on Perf and PCB Effects Layouts: EarthQuaker Devices Plumesdtgehringhttp://www.blogger.com/profile/09555201436004501222noreply@blogger.comBlogger61125tag:blogger.com,1999:blog-5481402030233340127.post-47741115741722168282023-12-04T11:14:45.931-05:002023-12-04T11:14:45.931-05:00I found a similar ploblem: the schematic is workin...I found a similar ploblem: the schematic is working but the output level is exagerate. With a 1kHz test tone and the gain pot setted to the minimum (tone and level full open) the AC gain is roughly 30. The gain control almost immediately undergoes to clip (let's say among the 8 and 9 o'clock depending upon the diode switch position)<br />Values of R6 and gain pot are not convincing to me.<br />Anyone has the same impression?<br />Best Regards :) DChttps://www.blogger.com/profile/17761134967604348257noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-89796407057594013202023-08-30T17:17:00.135-04:002023-08-30T17:17:00.135-04:00C4 and R4 combines to make a high pass filter that...C4 and R4 combines to make a high pass filter that cuts anything below 338Hz (using 100nF and 4.7k respectively). Since the low b string is ~30Hz and the low e string is ~40Hz you should increase C4 and/or R4 to lower the cut off. Either 56Kohm or 20uF should do it. Or you could try both 10Kohm and 1uF together.<br /><br />See section 1.4.3 here: https://www.electrosmash.com/tube-screamer-analysisChrishttps://www.blogger.com/profile/17792005482753132783noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-89459934497929820962023-05-23T16:46:31.615-04:002023-05-23T16:46:31.615-04:00A 10M resistor?!?
Somebody over at EQD needs to C...A 10M resistor?!?<br /><br />Somebody over at EQD needs to CALM DOWN.Derekhttps://www.blogger.com/profile/03947322623675705748noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-45678595590278029422022-04-07T15:00:34.000-04:002022-04-07T15:00:34.000-04:00and my build is brighter than the plumesand my build is brighter than the plumesChrishttps://www.blogger.com/profile/02028384888713040830noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-91292585127116585252021-12-16T04:25:15.645-05:002021-12-16T04:25:15.645-05:00While the build is hot, an update:
I got rid of hi...While the build is hot, an update:<br />I got rid of hi freq hiss by replacing LMC7660IN with 7660s cpaz as mentioned above. No distraction anymore regardless of Tone pot position.Anatoliihttps://www.blogger.com/profile/07139959597148703233noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-78833832190683712802021-12-15T04:39:00.037-05:002021-12-15T04:39:00.037-05:00Verified with LMC7660IN. However, had to scratch m...Verified with LMC7660IN. However, had to scratch my head about very low output until I brought in the lovely EFL tester and like in 30 seconds spotted broken level pot. Replaced with 500K Log and it worked just fine. Especially like how the bass sounds @ minimum gain with no clipping involved. Thanks for the great build and your work!Anonymoushttps://www.blogger.com/profile/11606803063775913856noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-37089015051608631982021-05-05T12:11:08.273-04:002021-05-05T12:11:08.273-04:00Did anyone ever figure out exactly what is ideal f...Did anyone ever figure out exactly what is ideal for more/better bass? I have the actual EQD pedal and really like it but would love to do the cap switch to get make it a little better for bass. <br />presidentresidenthttps://www.blogger.com/profile/16036162253249338645noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-69152949129654466652021-04-17T23:09:04.611-04:002021-04-17T23:09:04.611-04:00I came to know tht my problem was 7660cpa where 7...I came to know tht my problem was 7660cpa where 7660s is neededZaraki1337https://www.blogger.com/profile/04815656896624384794noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-56412932179572332302021-04-16T03:10:32.320-04:002021-04-16T03:10:32.320-04:00Hi Rahul! I just commented on your post on the fb ...Hi Rahul! I just commented on your post on the fb page for diy pedal builders lol. Yeah the noise on my build is gone whenever I put a boss pedal in front of it so I tried the phase inverting buffer trick. It did remove the high pitch hum but there is still a low pitched hum past 12 oclock of the gain. I will try rebuilding this but if it’s the same, I might just use 500k for the gain potstargoosehttps://www.blogger.com/profile/01497152739824552990noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-42388383931950340822021-04-08T21:52:46.478-04:002021-04-08T21:52:46.478-04:00I have the same problem? Did u solve the problem?
...I have the same problem? Did u solve the problem?<br />Zaraki1337https://www.blogger.com/profile/04815656896624384794noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-28582564264220109902021-04-04T23:05:16.209-04:002021-04-04T23:05:16.209-04:00I have a high pitched squeal that changes pitch de...I have a high pitched squeal that changes pitch depending on the gain pot. Someone in madbean forums said that putting a phase shifting buffer in front cures it. Can someone confirm it? Thanks! :Dstargoosehttps://www.blogger.com/profile/01497152739824552990noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-72714238982728422021-03-17T14:55:07.054-04:002021-03-17T14:55:07.054-04:00Verified with 7660cpa
There i a high pitch back g...Verified with 7660cpa<br /><br />There i a high pitch back ground noise like whistleing<br /><br />But it might go away after i box it..im not sure thoughZaraki1337https://www.blogger.com/profile/04815656896624384794noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-51472905072415171522021-03-15T12:01:42.408-04:002021-03-15T12:01:42.408-04:00Can i use 7660cpa instead of 1044.?Can i use 7660cpa instead of 1044.?Zaraki1337https://www.blogger.com/profile/04815656896624384794noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-23729803508632043082021-03-14T18:50:09.420-04:002021-03-14T18:50:09.420-04:00Hi, just about to build this but few things I'...Hi, just about to build this but few things I'm seeing conflicting info on...<br /><br />The LEDs here are asymmetric, but Earthquakers description of the mode is symmetrical LEDs?<br /><br />Is R4 def 4.7K and not 1K as in the schematic? Read a few times now that 1ks incorrect. Chrishttps://www.blogger.com/profile/08819486264125862942noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-84160257531655832802021-03-08T15:12:07.316-05:002021-03-08T15:12:07.316-05:00I have similar problem. I have similar problem. wgmccchttps://www.blogger.com/profile/03132694408122229566noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-16685973741473643082021-03-06T13:00:15.607-05:002021-03-06T13:00:15.607-05:00Or maybe the 47nf going to ground I guess.Or maybe the 47nf going to ground I guess.Cochoishttps://www.blogger.com/profile/06508688482896325016noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-21249726112171402372021-03-06T11:42:17.319-05:002021-03-06T11:42:17.319-05:00When you said the 47nf cap, you were meaning the 4...When you said the 47nf cap, you were meaning the 470 nf after mug 2 of the tone pot ?<br />Replacing the 470nf by 220nf makes the pedal less bright ?<br />Thanks.Cochoishttps://www.blogger.com/profile/06508688482896325016noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-18376512767031668532021-02-21T15:03:29.271-05:002021-02-21T15:03:29.271-05:00C12 is extra power filtering I added mostly out of...C12 is extra power filtering I added mostly out of habit. It's apparently not necessary in this circuit. Just ignore SJ1Effects Layoutshttps://www.blogger.com/profile/11341183658959824998noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-26203623625949543212021-02-20T06:04:08.671-05:002021-02-20T06:04:08.671-05:00Sorry for the newbie question, but can anyone tell...Sorry for the newbie question, but can anyone tell me what purpose is being served by C12 and SJ1 in the schematic? I don't see them in the layout anywhere, nor do I see them on pedalPCB's schematic.Anonymoushttps://www.blogger.com/profile/02951463086186014850noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-46222994727160274042020-12-08T08:58:16.842-05:002020-12-08T08:58:16.842-05:00You could with C8 and C9. Negative sides connectin...You could with C8 and C9. Negative sides connecting to the Level pot. C2 though probably needs to stay non-polarized.Effects Layoutshttps://www.blogger.com/profile/11341183658959824998noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-46885914069308451622020-12-05T19:38:24.508-05:002020-12-05T19:38:24.508-05:00Can 1uf electrolytics be used instead of the box/p...Can 1uf electrolytics be used instead of the box/poly ones? How should they connect, if so? Mateushttps://www.blogger.com/profile/17742293547770179725noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-48816711005749986242020-11-06T21:30:14.038-05:002020-11-06T21:30:14.038-05:00I would probably start by replacing C1 and C6 with...I would probably start by replacing C1 and C6 with 1uF caps, C4 with anything from 1 to 10uF (negative side to R4), C5 to 470nF, C8 and 9 with 10uFs (negative sides towards the Volume pot). After that if there's still a bit too much treble (which I kinda doubt there would be) you could increase C3 and C7 to 470pF or 1nF. Sockets are your friends here.Effects Layoutshttps://www.blogger.com/profile/11341183658959824998noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-14535407415198458752020-11-06T20:41:48.345-05:002020-11-06T20:41:48.345-05:00@EffectsLayouts by audio path, do you mean that bo...@EffectsLayouts by audio path, do you mean that bottom row on the schematic, so C1, 2, 8, 9, and 10? Or also the ones up top?ACookehttps://www.blogger.com/profile/09326264268784048973noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-84239115786309045872020-09-09T23:05:03.427-04:002020-09-09T23:05:03.427-04:00Cool, thanks!Cool, thanks!Anonymoushttps://www.blogger.com/profile/06799469235000334220noreply@blogger.comtag:blogger.com,1999:blog-5481402030233340127.post-9388439475274214012020-09-09T13:15:20.941-04:002020-09-09T13:15:20.941-04:00It's to bias the input of the opamp. Usually a...It's to bias the input of the opamp. Usually a resistor like that is like 1M, but EQD must have found some mojo in using a 10M there.Effects Layoutshttps://www.blogger.com/profile/11341183658959824998noreply@blogger.com