tag:blogger.com,1999:blog-6847048658257278783.post6013272000602338619..comments2024-03-29T01:36:12.851+00:00Comments on Guitar FX Layouts: Mad Professor BlueberryIvIarkhttp://www.blogger.com/profile/08416945174853142251noreply@blogger.comBlogger59125tag:blogger.com,1999:blog-6847048658257278783.post-14607188061409469082017-09-08T23:23:05.226+01:002017-09-08T23:23:05.226+01:00Hi! If I want to add a switch (green LED-nothing-r...Hi! If I want to add a switch (green LED-nothing-red LED) on-off-on where i can put the 2 and 4 of the DPDT? Thanks very much!!!Anonymoushttps://www.blogger.com/profile/17974196712404396775noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-88631999512688507072016-10-05T09:09:09.646+01:002016-10-05T09:09:09.646+01:00Currently have it build on breadboard
Using the de...Currently have it build on breadboard<br />Using the default resistor values, my drains are nowhere near 5V.<br />They are about 0.4v Q1 and 1.4V Q2.<br />However, the pedal sounds pretty much like it should. The only thing is, it is a little 'noisy', but i guess that is because it is on breadboard without proper shielding en the occasional 'antenna-effect' happening.<br /><br />I tried biasing the first BF244A to 5V but at 4V it was already completely shut.<br />Somewhere during measuring it also started to oscillate from time to time...<br /><br />I'm curious about your experiencesSeg@fredohttps://www.blogger.com/profile/17829974182999631886noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-55124874057861811402016-06-06T21:02:27.180+01:002016-06-06T21:02:27.180+01:00hi , i got a question: what exactly is the first t...hi , i got a question: what exactly is the first transistor stage of the OD for? the schematic is over at fred briggs revolution deux blog.Merhulskyhttps://www.blogger.com/profile/10955968603326118430noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-85390231355987390312015-08-04T16:33:00.632+01:002015-08-04T16:33:00.632+01:00I built the Blueberry Bass Overdrive and it sounds...I built the Blueberry Bass Overdrive and it sounds awesome. I have attached a link to my build picture and hope that it can help someone else. Thanks and Great Layout.<br /><br />http://s1383.photobucket.com/user/denfox1/media/Blueberry_zpss2cpxcim.jpg.html?sort=3&o=0Anonymoushttps://www.blogger.com/profile/17552397697382107219noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-15109071806787413142015-04-26T11:48:04.954+01:002015-04-26T11:48:04.954+01:00Just built this and sounds really great. Although ...Just built this and sounds really great. Although I HIGHLY recommend lowering the gain pot value (50k maybe? I used 10k and the drive range is fully usable. The original 1Meg pot does nothing past about 9 o'clock and has ridiculously high gain)Eugeenehttps://www.blogger.com/profile/02958337381555549866noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-88708325252626120702015-04-23T02:49:52.191+01:002015-04-23T02:49:52.191+01:00no problem buddy. glad you built it, it was succes...no problem buddy. glad you built it, it was successful, and you like it.Zachhttps://www.blogger.com/profile/00044917566185720896noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-63772905717533360822015-04-22T23:34:48.564+01:002015-04-22T23:34:48.564+01:00johns,
i ended up using your layout of the bearfoo...johns,<br />i ended up using your layout of the bearfoot. It was exactly what I was looking for, thanks for the suggestion and the layoutAnonymoushttps://www.blogger.com/profile/14925845716000351084noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-32343364926523012962015-04-22T11:12:39.347+01:002015-04-22T11:12:39.347+01:00JFET and IC voltages will give us the best clue wh...JFET and IC voltages will give us the best clue where the problem may beIvIarkhttps://www.blogger.com/profile/08416945174853142251noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-53592726784014123572015-04-22T09:27:48.048+01:002015-04-22T09:27:48.048+01:00Same thing here, checked the whole board like 10x,...Same thing here, checked the whole board like 10x, and have the same issue :/Eugeenehttps://www.blogger.com/profile/02958337381555549866noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-35103098736610454672015-04-14T03:16:03.254+01:002015-04-14T03:16:03.254+01:00Thanks for the reply, ill check out the other peda...Thanks for the reply, ill check out the other pedalsAnonymoushttps://www.blogger.com/profile/07206893320026549656noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-28257946457294171652015-04-14T03:08:55.937+01:002015-04-14T03:08:55.937+01:00you are correct. but since they are used as clippi...you are correct. but since they are used as clipping diodes, it doesn't matter as long as you place them anti-parallel. also, you may want to check out the bearfoot blueberry and/or the bjfe blueberry. not as much gain as the mad professor version, and in mine and a lot of the bassists here prefer them over this. this one seems kinda lifeless when you play, but that's just MHO. i've made, posted, and verified layouts for the bearfoot and bjfe and they're posted in the contributions section.Zachhttps://www.blogger.com/profile/00044917566185720896noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-40747364500123779032015-04-14T02:45:28.018+01:002015-04-14T02:45:28.018+01:00I am about to build this and wanted some clarifica...I am about to build this and wanted some clarification on the led orientation. Is the darker shaded area the cathodeAnonymoushttps://www.blogger.com/profile/07206893320026549656noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-61916610276521666172015-02-05T15:50:14.211+00:002015-02-05T15:50:14.211+00:00Hi Guys,
I'm new to making pedals and chose t...Hi Guys,<br /><br />I'm new to making pedals and chose this for my first build :D <br /><br />It was quite challenging for a newbie to get this into my 1590B but managed it after a couple of false starts and extra holes in the box :)<br /><br />Thanks for all the info and layouts on this site, great stuff!<br /><br />Pictures are on my flickr if you want to take a look: https://www.flickr.com/photos/drofmij/sets/72157650530443205/<br /><br />Jim Fordhttps://www.blogger.com/profile/17303082332978057906noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-49271091280000968782014-04-13T21:35:37.408+01:002014-04-13T21:35:37.408+01:00Hey guys just built this up... yeah im late to the...Hey guys just built this up... yeah im late to the party on this one, just hoping to get some help.<br /><br />All the pots seem to be working correctly but the overall output is too quiet. With drive and vol at 100% its right at unity. I used BF244As and biased right at 5ish volts on both drains. Also checked all the cuts, component placement, and metered for bridges... all the normal stuff and still no luck! If anyone has any suggestions i would appreciate it!<br />Mohttps://www.blogger.com/profile/11883503754277805024noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-7105500230414896622014-02-13T07:43:02.776+00:002014-02-13T07:43:02.776+00:00Finished this yesterday, could only try it with gu...Finished this yesterday, could only try it with guitar yet. Even for that it is quite nice :) For the jfets I only had one BF244A at home, so I had to play a bit. The BF244Bs did not work well, probably after some tweaking with the biasing they would be ok as well. Found the same with BF245Bs. Then I tried a 2n3819 and that was it. BF244A at the beginning and 2n3819 at the end, and you are good to go. Also the opamp can be changed, I tried LM308, OP07, they both resulted in a rat-like distortion, just not that high gain. Absolutely not bad, maybe a tad too dark. TL071 can be used too, that gives you a somewhat cleaner and brighter sound.drdFXhttps://www.blogger.com/profile/05100895565160403133noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-29124730835373054802014-01-22T18:24:51.108+00:002014-01-22T18:24:51.108+00:00Hi, thanks for the layout. I've built the ped...Hi, thanks for the layout. I've built the pedal And it only works when the gain pot is on low. At other settings I get loud oscillations like a tone generator . One of the green leds flashes a lot. Any help would be appreciated! Gary Park Pedalhttps://www.blogger.com/profile/09718907010666390686noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-85100996774025194212013-12-27T04:49:49.961+00:002013-12-27T04:49:49.961+00:00This comment has been removed by the author.BaklavaMetalhttps://www.blogger.com/profile/16682813246556678259noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-11073040795051987122013-12-16T19:42:53.910+00:002013-12-16T19:42:53.910+00:00can i replace the green led to red or yellow?can i replace the green led to red or yellow?Anonymoushttps://www.blogger.com/profile/07212649606876415023noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-48856769346508877512013-08-15T00:05:19.229+01:002013-08-15T00:05:19.229+01:00Great pedal I have two questions ...The gain of th...Great pedal I have two questions ...The gain of the pedal seems quite high is there a simple way to lower it? and the Nature control is WAY TO PHAT on the bottom end ..any simple way to change the low pass filter? <br /><br />Athoshttps://www.blogger.com/profile/15993308671509552491noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-51913998922102514912013-06-16T17:44:11.042+01:002013-06-16T17:44:11.042+01:00Yes but i think it is weird, because Volume 1 is o...Yes but i think it is weird, because Volume 1 is on the ground, Volume 2 as output so, and Volume 3 is connected.<br /><br />So if i've well understood, we get the output signal only with the Volume 3 pot ?<br /><br />Thanks xxx yyyhttps://www.blogger.com/profile/15102736667154026997noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-57284096603927694432013-06-16T09:56:16.110+01:002013-06-16T09:56:16.110+01:00Volume 2 is output. So you are right, simply conne...Volume 2 is output. So you are right, simply connect Volume 2 with your footswitch.Rockenhttps://www.blogger.com/profile/16186604987883793974noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-73198949928105048552013-06-15T23:36:19.424+01:002013-06-15T23:36:19.424+01:00I've just finished to weld the circuit (except...I've just finished to weld the circuit (except BF244A, that I haven't received yet) so i've got some questions about offboard wiring (I have ever read all your wonderful documents).<br /><br />On the circuit, there is no output point except on the Volume 2(on Volume pot) ? So may I link right my footswitch to the Volume pot ? It is normal or it is a forgetting ?<br /><br />Thanks ;)<br /><br />xxx yyyhttps://www.blogger.com/profile/15102736667154026997noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-77480839413344207202013-06-02T22:31:28.013+01:002013-06-02T22:31:28.013+01:00Thank you IvIark, i understand. I will contact you...Thank you IvIark, i understand. I will contact you if I got building problemsxxx yyyhttps://www.blogger.com/profile/15102736667154026997noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-25493981309837501302013-06-02T18:42:07.170+01:002013-06-02T18:42:07.170+01:00It's an overdrive pedal, not a compressor and ...It's an overdrive pedal, not a compressor and they're used to clip the signal. They're in an anti-parallel arrangement, and so one LED clips one half of the waveform, and the other clips the other half.IvIarkhttps://www.blogger.com/profile/08416945174853142251noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-49818155751761022212013-06-02T18:35:54.135+01:002013-06-02T18:35:54.135+01:00okay but why 2 ? (for example on my ebs compressor...okay but why 2 ? (for example on my ebs compressor i've juste got one led which glow while playing and while powered)xxx yyyhttps://www.blogger.com/profile/15102736667154026997noreply@blogger.com