tag:blogger.com,1999:blog-6847048658257278783.post7872596740917476826..comments2024-03-27T15:26:01.893+00:00Comments on Guitar FX Layouts: Mad Professor Amber OverdriveIvIarkhttp://www.blogger.com/profile/08416945174853142251noreply@blogger.comBlogger40125tag:blogger.com,1999:blog-6847048658257278783.post-36826725660248111452018-08-05T23:31:33.255+01:002018-08-05T23:31:33.255+01:00Tone control not working. Any ideas why? The volta...Tone control not working. Any ideas why? The voltage to the drain of the 2n5485 is only .15 volts, is that correct? Any help would be appreciated. Thanks in advance.AK7INhttps://www.blogger.com/profile/12679186994842470722noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-49086097597131914412016-12-18T05:21:28.809+00:002016-12-18T05:21:28.809+00:00I just built one with 2sk117s as the Jfet "di...I just built one with 2sk117s as the Jfet "diodes" and I like it better than the P19. It has more range to the dirt - the P19 is cool but is full-on grrr from the word go. And the Amber has a more vocal tone to it which I like.<br /><br />It is VERY LOUD though! I have volume and gain at 9.00 for unity. After that it gets crazy!Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-20601199924617549362016-12-06T12:15:13.047+00:002016-12-06T12:15:13.047+00:00Oh definitely not angry! Sorry if that doesn'...Oh definitely not angry! Sorry if that doesn't come across online. Just trying to explain that in the notes its not clear what they are connected to. I get it now. If it said in the notes "connected to each other" I would have understood immediately. I'm not savvy enough to know that you can make a transistor into a diode effectively.<br /><br />Sometimes the written word is not as effective as the spoken. I may not read things the way you hear them in your head as you write. And vice versa.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-39480078929366304392016-12-01T16:58:27.706+00:002016-12-01T16:58:27.706+00:00The drain and source are connected, i.e. Take the ...The drain and source are connected, i.e. Take the leg of the drain and physically connect it to the source leg and solder it together. I don't know why you're getting so angry about it, when I explain it say it's in the notes. Zachhttps://www.blogger.com/profile/00044917566185720896noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-51122658338542031842016-12-01T14:14:13.532+00:002016-12-01T14:14:13.532+00:00I only asked because I did read the notes and wond...I only asked because I did read the notes and wondered what you connected the drain and source to!Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-80225657327197108182016-09-01T08:01:18.026+01:002016-09-01T08:01:18.026+01:00Cheers, there are some differences in transistors ...Cheers, there are some differences in transistors and component values but overall they are indeed similar. Harry Maeshttps://www.blogger.com/profile/03595859466685312288noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-9072322274785065192016-09-01T00:03:06.195+01:002016-09-01T00:03:06.195+01:00It's a big muff with fet clipping in stage 2, ...It's a big muff with fet clipping in stage 2, so since they're both muff variants you can say they're similar. Zachhttps://www.blogger.com/profile/00044917566185720896noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-27331217672804490862016-08-31T21:18:49.000+01:002016-08-31T21:18:49.000+01:00Isn't this close to a Skreddy P19?Isn't this close to a Skreddy P19?Harry Maeshttps://www.blogger.com/profile/03595859466685312288noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-51413882290417786232016-07-02T18:44:11.514+01:002016-07-02T18:44:11.514+01:00Sounds great this. Used BF245As for D1 & 2. It...Sounds great this. Used BF245As for D1 & 2. Its nice and loud.Hozy31https://www.blogger.com/profile/16714771534041521767noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-70289461098533329572016-06-30T10:11:22.846+01:002016-06-30T10:11:22.846+01:00Personal preference just. Bringing them back to t...Personal preference just. Bringing them back to the board means less wiring flying loose in the enclosure making for a neater look. I admit that I keep it all neat inside when building for a customer...but for my own I just bring every ground to a "point in the sky," twist, solder and heat shrink. It's faster, but awful looking.Ciaran Hasletthttps://www.blogger.com/profile/14841971807120256954noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-47403551392057347022016-06-29T20:16:13.677+01:002016-06-29T20:16:13.677+01:00Hi, guys. Really basic question here, and not nec...Hi, guys. Really basic question here, and not necessarily particular to this layout (though it happens here too). I see on a lot of the layouts that a lead from a pot comes back to hit the ground rail on the board (like Vol 1 does on this layout). Is there a reason for this, other than just convention? It seems to me that it would make for a cleaner build if that lead went straight to a common ground in the enclosure. Am I all wrong here?Joelhttps://www.blogger.com/profile/10726778476868015529noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-5273235188783558192016-06-28T03:31:13.289+01:002016-06-28T03:31:13.289+01:00What software do you use to design your schematics...What software do you use to design your schematics, veroboards and other drawings such as offboard wiring (switches, jacks, etc??)Frankhttps://www.blogger.com/profile/10358320466301878459noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-48077101645741690152016-06-22T17:05:21.333+01:002016-06-22T17:05:21.333+01:00Is there any schematic the tonestack available?Is there any schematic the tonestack available?Merhulskyhttps://www.blogger.com/profile/10955968603326118430noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-83416873976200159892016-06-22T05:08:39.648+01:002016-06-22T05:08:39.648+01:00nope, it was left over when i was messing around m...nope, it was left over when i was messing around making the layout. just fixed and reupped the layout. thanks and nice catch. Zachhttps://www.blogger.com/profile/00044917566185720896noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-36503200237844691982016-06-21T22:34:50.320+01:002016-06-21T22:34:50.320+01:00sorry, where is the 5th link??? i just see 4 o the...sorry, where is the 5th link??? i just see 4 o them<br />or the longest one has a double link?Anonymoushttps://www.blogger.com/profile/17680493396224747285noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-19221362722571493212016-06-21T18:04:23.984+01:002016-06-21T18:04:23.984+01:00Gotta have this one!!!Gotta have this one!!!Doron Barnesshttps://www.blogger.com/profile/11002512823760367163noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-14586492059814271882016-06-21T17:11:31.912+01:002016-06-21T17:11:31.912+01:00you're right, they're JFETs. i assumed the...you're right, they're JFETs. i assumed they were MOSFETs cause i honestly never heard of JFETs as clipping diodes. honestly, never been a real fan of the mad professor stuff, the BBD being the one major exception. good to know.Zachhttps://www.blogger.com/profile/00044917566185720896noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-18040122325344006372016-06-21T08:40:36.362+01:002016-06-21T08:40:36.362+01:00Absolutely agree: one can never have enough muffs....Absolutely agree: one can never have enough muffs.drdFXhttps://www.blogger.com/profile/05100895565160403133noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-81646993122580543322016-06-21T08:39:01.247+01:002016-06-21T08:39:01.247+01:00@Matt,
That's correct. Or you can go the way Z...@Matt,<br />That's correct. Or you can go the way Zach mentioned if the holes are too small for two legs (god, I can't help, but with conjuntion of "muff" I have some very nasty thoughts writing the above :D). As for diodes: both the 1N4148 and the 1N4001 should be ok. Try to put sockets there and see what fits you best (my all time advice when it comes to clipping diodes)<br /><br />@Zach,<br />Are you sure about the MOSFETs? The good folks at FSB mention only 2n3819 in that position and that is definitely a JFET. Also Mad Professor is known to use JFETs, more precisely 2N3819s in several designs as clipping diodes (the Fire Red Fuzz - which is almost identical to this one except for the tone stack and the Sky Blue OD as well). Nevertheless I'm still true to my statement that using simple Si diodes will yield almost the same (if not totally the same) sound as using JFETs - for way less money.drdFXhttps://www.blogger.com/profile/05100895565160403133noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-76662666541186629192016-06-20T23:33:03.761+01:002016-06-20T23:33:03.761+01:00Gotta get a beer!Gotta get a beer!Anonymoushttps://www.blogger.com/profile/02519375275213556637noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-70772721518339953032016-06-20T23:17:34.434+01:002016-06-20T23:17:34.434+01:00Thanks very much RD.
I will just socket the 2 par...Thanks very much RD. <br />I will just socket the 2 parts and play with the sounds. Starting with the diodes. <br />I guess it is a dumb q, but if I were to use 2 legged fet's would the flat sides be back to back? <br />I think I need transistor theory regarding polarity.Anonymoushttps://www.blogger.com/profile/02519375275213556637noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-83774615448126995592016-06-20T23:13:49.828+01:002016-06-20T23:13:49.828+01:00This comment has been removed by the author.Anonymoushttps://www.blogger.com/profile/02519375275213556637noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-45465982830134265082016-06-20T20:44:00.948+01:002016-06-20T20:44:00.948+01:00Hi Jeff. What you mean by, you need to know about ...Hi Jeff. What you mean by, you need to know about orientation? Just like two diodes, one oposed to the other, after you have drain and source legs together as you are mentioning. Like in the schematic of any muff variant.<br />O<---O<br />O--->O<br />or<br />O-DS-G-O<br />O-G-DS-O<br /><br />basicaly you have drain and source of D1 with Gate of D2 in the same point, and Gate of D1 with drain and source of D2 in the other. <br /><br />Or, just forget the fets and put there two of silicon diodes. :DRareDevilhttps://www.blogger.com/profile/08659408560527704081noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-86168365550335589932016-06-20T18:17:58.714+01:002016-06-20T18:17:58.714+01:00It does still sound like a muff. Its just a differ...It does still sound like a muff. Its just a different flavor.onthetundrahttps://www.blogger.com/profile/02537670146742701763noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-41594724560777575852016-06-20T17:44:26.187+01:002016-06-20T17:44:26.187+01:00It is a modified big muff, but doesn't really ...It is a modified big muff, but doesn't really sound like one. It's more of s medium to higher gain overdrive. Plus, since when is a big muff s bad thing? Show me a man with too many muffs and I'll show you a man who has yet to live. Zachhttps://www.blogger.com/profile/00044917566185720896noreply@blogger.com