tag:blogger.com,1999:blog-6847048658257278783.post532614954994368878..comments2024-03-28T18:53:30.726+00:00Comments on Guitar FX Layouts: Menatone King of the BritainsIvIarkhttp://www.blogger.com/profile/08416945174853142251noreply@blogger.comBlogger33125tag:blogger.com,1999:blog-6847048658257278783.post-23009312142816532462020-01-07T05:52:49.509+00:002020-01-07T05:52:49.509+00:00Thank you!Thank you!Phil Robleshttps://www.blogger.com/profile/15273875571864445957noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-82450622526153891502018-03-04T11:04:30.362+00:002018-03-04T11:04:30.362+00:00Hello, in my research on the subject of J201 bias,...Hello, in my research on the subject of J201 bias, your meter should read as follows:<br />Type LocĀ° Resis. Drain Gate<br />J201 Q01 22K 4,24 v 0,33 v<br />J201 Q02 22K 5,23 v 0,30 v<br />J201 Q03 15K 5,46 v 0,24 v<br />J201 Q04 0K0 9,00 v 6,15 v<br />J201 Q05 15K 3,87 v 2,26 v<br />J201 Q06 3K9 5,38 v 0,17 v<br />.Frederik Eriksonhttps://www.blogger.com/profile/05133197265918130589noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-67899282479145542712015-12-31T22:06:45.945+00:002015-12-31T22:06:45.945+00:00Hello , here is what I found about biasing of the ...Hello , here is what I found about biasing of the bunch of J201 transistors inside this pedal , values are around transistors symbols :http://revolutiondeux.blogspot.fr/2008/11/menatone-king-of-britons.html<br />Le Comte de Fourqueshttps://www.blogger.com/profile/08052835940263893293noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-45492882950783027272014-04-21T23:35:16.694+01:002014-04-21T23:35:16.694+01:00I was wondering, are q4 and q5 biased separately? ...I was wondering, are q4 and q5 biased separately? One of them seems to be biased by the 15k resistor but is the other one biased at all and if so, by which resistor? Or is something happening by the gate of the one fet going into the drain of the other? <br /><br />Tx.Zickhttps://www.blogger.com/profile/13994632340716656660noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-16591030406845100592014-02-18T17:35:03.450+00:002014-02-18T17:35:03.450+00:00Built this (again). First with all trimmers and it...Built this (again). First with all trimmers and it sounded ok but looked horrific with all trimmers bent everywhere etc so I removed them all and replaced them with the resistors in the layout and it sounded terrible. I'd definitely recommend using sockets or trimmers. After all afternoon messing with it I gave up and binned it. Shame as it has the potential to sound excellent. I just haven't got the patience unfortunately.Anonymoushttps://www.blogger.com/profile/14965761421314500927noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-40908042685918521972013-08-05T22:18:28.894+01:002013-08-05T22:18:28.894+01:00Can anyone post the drain voltages from the orgina...Can anyone post the drain voltages from the orginal what they are supposed to be? I got all but Q4 and Q6 to be in the usual 4.5-5V range, but those two are hovering around 7-8V.Jarrett Trezzohttps://www.blogger.com/profile/01510785395468117915noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-74435276964079986982013-08-04T07:31:05.818+01:002013-08-04T07:31:05.818+01:00I have to ask, where are you getting such odd valu...I have to ask, where are you getting such odd values 20k and 22k??? I've sometimes looked for these and cant find them, but plenty of 25ks.Jarrett Trezzohttps://www.blogger.com/profile/01510785395468117915noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-68654837834868115202012-10-22T12:17:43.238+01:002012-10-22T12:17:43.238+01:00Consider socketing the drain or source resistors f...Consider socketing the drain or source resistors for all the JFETs, or even better use appropriate value trimmers instead. The bias may well need tweaking and you don't want to have to solder and de-solder resistors.IvIarkhttps://www.blogger.com/profile/08416945174853142251noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-48575909512904548022012-10-22T11:16:31.098+01:002012-10-22T11:16:31.098+01:00Looking forward to building this one. Sounds great...Looking forward to building this one. Sounds great.<br /><br />Any plans to do a layout for the Menatone Pig?Big Pauliehttps://www.blogger.com/profile/01971544526116889975noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-36107132750863617722012-06-20T23:31:35.390+01:002012-06-20T23:31:35.390+01:00Awesome, you hero. Particularly so as Carlo could...Awesome, you hero. Particularly so as Carlo couldn't get his working which made this a brave build (although I have gone over it lots and couldn't see any issues). Thanks for verifying, that's 201! :o)IvIarkhttps://www.blogger.com/profile/08416945174853142251noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-16791887107079877872012-06-20T23:28:19.477+01:002012-06-20T23:28:19.477+01:00Verified, populated this fully expecting to spend ...Verified, populated this fully expecting to spend a good while switching jfets, fired it up and it worked straight of the bat. All controls work as they should including the gain pot. Not quite sounding as it should but i`m confident it will with a bit of fine tuning the j201`s after all i only expected to get a refernce point to start with, drain voltages aint perfect yet so a little tweaking tomorrow should sort things out. Drain voltages at the moment are,<br />Q1-4.72v<br />Q2-4.68v<br />Q3-5.4v<br />Q4-8.98v<br />Q5-4.22v<br />Q6-6.98v<br />The circuit deffo works so should only be a matter of fine tuning, thanks for another great layout.dexxyyhttps://www.blogger.com/profile/15083992477248920480noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-20006714727251960592012-06-12T11:16:17.793+01:002012-06-12T11:16:17.793+01:00In my experience, the 2N5457s have been quite cons...In my experience, the 2N5457s have been quite constant when compared to J201s. For three matched J201s i had to go through 30 to find ones that work together. So for six i'd need to get at least 60 :)<br /><br />I'll try this with 2N5457s at some point.<br />+mmirosolhttps://www.blogger.com/profile/02400327798106357876noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-24971560334488332792012-06-12T09:55:17.275+01:002012-06-12T09:55:17.275+01:00FETs can be more awkward to swap because they may ...FETs can be more awkward to swap because they may need other tweaks to bias properly, but just try anything with the same pin out. 2N5457, 2N5484, MPF102 etcIvIarkhttps://www.blogger.com/profile/08416945174853142251noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-58072417446795028032012-06-12T09:49:18.995+01:002012-06-12T09:49:18.995+01:00Would this design accept any other FETs? I find J2...Would this design accept any other FETs? I find J201s to be horrid to find suitable 3, not to mention 6...<br />+mmirosolhttps://www.blogger.com/profile/02400327798106357876noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-65104612882090485682012-05-02T22:44:56.538+01:002012-05-02T22:44:56.538+01:00Carlo, can you post a front and back pic. Just be...Carlo, can you post a front and back pic. Just been over the layout again and can't see any deviation from the schematic, so I'll have a look to see if anything jumps out at me.IvIarkhttps://www.blogger.com/profile/08416945174853142251noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-34957951625038000642012-05-01T09:09:28.751+01:002012-05-01T09:09:28.751+01:00Haha I know I should mate, If it were a nice effec...Haha I know I should mate, If it were a nice effect I probably would of as with the Meathead,RAT etc... but it just didn't warrant saving (in my opinion). For 6 knobs it was just so so... I think I'm like that with all pedals to an extent... I've never plugged into anything that sounds as good as one cable straight into an amp..Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-34135210239261364072012-05-01T08:12:11.453+01:002012-05-01T08:12:11.453+01:00If it wasn't silent at full counter clockwise ...If it wasn't silent at full counter clockwise then the pot was either damaged or it wasn't grounded properly, which could have accounted for the noise. You should give it a bit longer before you bin them mate!IvIarkhttps://www.blogger.com/profile/08416945174853142251noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-89649377119741618262012-05-01T07:53:32.370+01:002012-05-01T07:53:32.370+01:00Hi Carlos, I'm sorry I have binned it so I can...Hi Carlos, I'm sorry I have binned it so I can't take any info from my attempt.<br /><br />Hi Mark, My gain was acting in the way you described but it wasn't silent at full anticlockwise. I think even if mine had 'worked' I would have recycled it as it sounded really harsh.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-41509841148228898042012-05-01T00:32:38.984+01:002012-05-01T00:32:38.984+01:00The gain control in this is a simple voltage divid...The gain control in this is a simple voltage divider, like a volume control but at the beginning of the circuit after the input buffer. So in the fully clockwise position it's letting the entire signal through and as you move counter clockwise it puts more resistance in the way, and eventually dumps the output to ground completely and so should be totally silent in the fully ccw position. It's the same as the gain control in the Distortus Maximus Vince, does that behave in a similar way?IvIarkhttps://www.blogger.com/profile/08416945174853142251noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-75202419022389035322012-04-30T23:08:05.559+01:002012-04-30T23:08:05.559+01:00The zero-gain is a common problem... Vince, could ...The zero-gain is a common problem... Vince, could you post your transistors voltages?Carlohttps://www.blogger.com/profile/13070081219428002357noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-71899848477519242322012-04-30T11:26:52.424+01:002012-04-30T11:26:52.424+01:00Also, the gain doesn't seem to make a signific...Also, the gain doesn't seem to make a significant difference from 0 to max.. Anyway, To me it doesn't sound great anyway so I've gutted it.. I need to find a another 6 knobber to fit my enclosure now lolAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-82551983300273715242012-04-30T11:15:18.504+01:002012-04-30T11:15:18.504+01:00I'm getting all sorts of squeaks, whistles and...I'm getting all sorts of squeaks, whistles and buzzes when adjusting the Gain,level and master...with everything on 12, it sounds ok but over that introduces noises etc.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-16965070382406957522012-04-26T23:46:31.714+01:002012-04-26T23:46:31.714+01:00It's not verified yet, but it sounds like you&...It's not verified yet, but it sounds like you're not too far away if you're getting output and your voltages look mostly good. A couple of other people are building it so see what results they get and we can look into it further.IvIarkhttps://www.blogger.com/profile/08416945174853142251noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-43230368348972343622012-04-26T21:24:21.172+01:002012-04-26T21:24:21.172+01:00Hi, is this layout verified? I've built this p...Hi, is this layout verified? I've built this pedal, the signal passes through the circuit, the EQ is OK, but there's no gain... I've the same voltages of the original one, except for Q6 drain, which is 7,5V instead of 5,4V... The stripboard is OK (cut traces, value of components, wiring, etc...)<br />Could I solve with a trimpot to bias correctly or not?Carlohttps://www.blogger.com/profile/13070081219428002357noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-11159001058227302802012-04-26T09:33:39.948+01:002012-04-26T09:33:39.948+01:00You can use use any taper and it will work exactly...You can use use any taper and it will work exactly the same at the minimum and maxmum settings, but it may not be quite as useful through the entire sweep. Having said that it also has the potential to be more useful depending on where you usually have the mids pot set. If your usual setting of a linear pot is half way, then that would probably be an 80% clockwise rotation of a log pot. That means you have more fine tuning resolution in the scooped to flat mids setting. If you usually have mids boosted slightly, then the log pot would be less useful and a reverse log would give you the greater fine tuning resolution from flat to boosted mids settings.IvIarkhttps://www.blogger.com/profile/08416945174853142251noreply@blogger.com