tag:blogger.com,1999:blog-6847048658257278783.post4131262192974325106..comments2024-03-29T01:36:12.851+00:00Comments on Guitar FX Layouts: Fender BlenderIvIarkhttp://www.blogger.com/profile/08416945174853142251noreply@blogger.comBlogger55125tag:blogger.com,1999:blog-6847048658257278783.post-82913522987704845272019-02-20T00:01:39.060+00:002019-02-20T00:01:39.060+00:00guys, hi gain q's won't work right in this...guys, hi gain q's won't work right in this circuit. any low gain npns should be fine. try around 200 hfe. when these were new, high gain transistors weren't normal. too high and it will lose the ability to fuzz right, and be strident and more of a boost. seriously. higher hFE does NOT a better fuzz make always, despite typical internet lore.<br />if ya socketed your build, try something with the lowest gain ya got, and odds are suddenly the cct will come to life.pinksterhttps://www.blogger.com/profile/13385798043782856976noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-53828254059692940592017-10-05T05:57:12.285+01:002017-10-05T05:57:12.285+01:00I may have come off a bit more guns blazing that w...I may have come off a bit more guns blazing that was actually warranted. However, i've been debugging my builds and faulty factory pedals on a daily basis for almost ten years now. It's never a semiconductor type :)<br /><br />For oldmanonthehill, toss the power supply. I'm fairly certain that you have had a short on a circuit that's burnt the regulator on your bench wall wart. If you don't have a proper bench supply with quick release fuse, i'd strongly suggest using batteries for bench testing purposes. Battery snap soldered on to standard plug is a nice thing to have around. You're bound to have shorts in the future too, so draining a battery in 20 seconds is still economically better than to burn wall wart regulators.<br />+mmirosolhttps://www.blogger.com/profile/02400327798106357876noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-34557925607556961402017-10-05T02:27:06.304+01:002017-10-05T02:27:06.304+01:00that's awesome news man. really glad you got i...that's awesome news man. really glad you got it up and running as expected and it was something small. <br /><br />btw, good info miro and something to keep in mind. i know you weren't insinuating i was being misleading on purpose or anything. Zachhttps://www.blogger.com/profile/00044917566185720896noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-89398983508413845392017-10-05T00:18:08.369+01:002017-10-05T00:18:08.369+01:00Been a bit busy so not been near the pedal for a b...Been a bit busy so not been near the pedal for a bit but, after much agonising, checking of tracks/components/joints the problem turned out to be... the power supply.<br />I switched from my workshop's 9V wall wart to the 1 Spot on my pedalboard and voila, all extraneous noise has gone.<br /><br />This may re-awaken some old projects that I'd long since written off. Good news all round.<br /><br />Plus, this pedal spits and fizzes like a beast (2N5088s and 1N34a diodes).<br /><br />Thanks for all your amazing work - this is such a brilliant resource.oldmanonthehillhttps://www.blogger.com/profile/02376899386318257948noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-13819860611910147912017-09-29T07:50:59.229+01:002017-09-29T07:50:59.229+01:00There is no NPN silicon BJT transistor that can...There is no NPN silicon BJT transistor that can't be subbed 1:1 with another type. Gain range and a few other features can, and will affect the tone for example, in BMP circuits, where BJT amplifiers are stacked and the amplification factor is high due to circuit topology. In fact, if i'd get too much noise out of any circuit, the solution would be to check the caps and gain setting components. Variance of 20% in many caps is way more likely to cause the issue than the semiconductor(s).<br /><br />In my experience, substitution of any NPN BJT is never an issue with oscillation or any other major malfuction. Slight tonal differences may occur, but oscillation will never go away with replacing NPN BJT with another NPN BJT. This applies to 99% percent of all semiconductors that have exactly the same main purpose with each other. To be exact, all switching transistors, HF transistors and general purpose amplifier transistors are interchangeable. No, they do not all sound the same in the same circuit, but they all will function right in our small signal, low voltage applications.<br /><br />Cross refence guides for transistors rarely apply to our small signal applications. Those usually focus on transistor switching times and other major functions. Thus, not that viable information in this field of application.<br /><br />I wasn't implying that you were misleading on purpose. But it's never the transitor type that is at fault when you get an oscillation issues. This is equilevant to people trying to fix old chorus/flangers/delays. For some reason, human mind always thinks the fault is with the most expensive and the biggest semiconductor on board. Hint. It almost never is.<br /><br />Suggestion to cure oscillation with replacing an NPN BJT with another type of NPN BJT is not helpful to anyone. Debugging is the only way out of squeeling.<br />Sure. It could be a burnt, shorted or otherwise dead transistor. But it almost never is. Swapping transistors won't help a bit until one is compeletely certain the fault is in fact with the transistor.<br />+mmirosolhttps://www.blogger.com/profile/02400327798106357876noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-61156612021117011332017-09-28T22:36:37.471+01:002017-09-28T22:36:37.471+01:00hey miro. i wasn't trying to be misleading at ...hey miro. i wasn't trying to be misleading at all. i did a search for substitutions and didn't see BC550 or 2N5088 as viable subs, all that i found were transistors that were 2N4124, 2N4401, and 2N4403 as possible subs, but nothing for definite. as such i didn't want to say "hey man try X transistor in place of the 2n3391 & 2n3391a" cause if they didn't work either i would feel like a prick. coupled with the fact that 2n3391 & 2n3391a are readily available and inexpensive.<br /><br />when i have builds that don't work right my first thing to try after going through the board checking for common things, like bridges and mismatched components, is to get the listed active parts if i've subbed them for something else, ICs & transistors, to see if that corrects the problem. if it doesn't then i dig into the board more and do much deeper debugging. Zachhttps://www.blogger.com/profile/00044917566185720896noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-72481703938049194922017-09-28T21:30:08.426+01:002017-09-28T21:30:08.426+01:00Thanks mirosol, nice finally to benefit personally...Thanks mirosol, nice finally to benefit personally from your expertise! I've checked for shorts and placement as you said, but will double double check. Also thanks to you both for replying so promptly. 1am debugging is no fun...<br />From what I can tell it's a problem with the Blend control so I'll start there and work back.<br /><br />Oh, and I have no idea why I show up as Unknown.<br /><br />Hopefully I'll report back with good news.oldmanonthehillhttps://www.blogger.com/profile/02376899386318257948noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-6724448661733770112017-09-28T05:44:05.129+01:002017-09-28T05:44:05.129+01:00What!!??
No.
All of the transistors listed above...What!!??<br /><br />No.<br /><br />All of the transistors listed above are NPN Silicon transistors and thus totally interchangeable. Also Mark clearly states on the layout that the ones "unknown" tried are very much suitable substitutes. I've built the circuit myself a few times with 2N5088s and had no issues.<br /><br />So for one, Zach. No. Advice like that is complete crap and totally misleading.<br /><br />For two, oscallition issues are most likely to arise from tiny short(s) on the board. Unknown, use a knife to clean the strip gaps, triple check cuts and component placement. Then construct a probe and see where the oscallation starts. If none of those help, then measure voltages from each transistor pins and post them here. Someone may (or may not) have a board on hand and compare. Or in good case, one of those voltages could tell someone straight away where the problem lies.<br /><br />Debugging skills are the most crucial part of building... And. Also. Welcome Unknown.<br />+mmirosolhttps://www.blogger.com/profile/02400327798106357876noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-81065633117542713572017-09-28T01:09:50.123+01:002017-09-28T01:09:50.123+01:00the problem is you're using the wrong transist...the problem is you're using the wrong transistors. neither of those are substitutes for 2n3391a or 2n3391. i would get the correct transistors and it should work no problem.Zachhttps://www.blogger.com/profile/00044917566185720896noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-39698328854771324062017-09-28T00:56:23.075+01:002017-09-28T00:56:23.075+01:00I've got it working but there's a hellish ...I've got it working but there's a hellish howl that I can't get rid of. I've tried BC550s and 2N5088s (turned 180) but there doesn't seem to be any difference. I'm using 1N34As for the diodes.<br />I'm in no way a pro at this; any help is gratefully received!oldmanonthehillhttps://www.blogger.com/profile/02376899386318257948noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-43733047683141138442017-05-13T01:31:14.926+01:002017-05-13T01:31:14.926+01:00i built one and it works perfect. it also says &qu...i built one and it works perfect. it also says "verified" below the layout.johnkhttps://www.blogger.com/profile/00643996045674470081noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-17582589866544594162017-05-13T01:05:30.187+01:002017-05-13T01:05:30.187+01:00any follow ups to if this build is verified ? any follow ups to if this build is verified ? chuston808https://www.blogger.com/profile/06827245086529215758noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-29830942230273814182015-04-18T14:27:51.043+01:002015-04-18T14:27:51.043+01:00so I've done an audio probe troubleshooting. t...so I've done an audio probe troubleshooting. turns out already at Q1 I don't get an output signal at Collector C, so, of course, almost all of the rest is dead. I have several transistors tested (2N3391A, BC549C and B).<br />What could be the problem? Where's the bug? Please help!99milesofbadroadhttps://www.blogger.com/profile/09668457921215647505noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-42220839063637984112015-04-08T15:26:28.916+01:002015-04-08T15:26:28.916+01:00I used 1n34a and still hear that choppy sound. I g...I used 1n34a and still hear that choppy sound. I get no fuzz out of this box anyway, just a rather clean signal with a choppy hiss. the blend knob, when turned down, doesn't give me a clean signal either. tripple checked on- and off-board. please help - i need to have this pedal!!!99milesofbadroadhttps://www.blogger.com/profile/09668457921215647505noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-25167237459662837672015-03-06T00:48:00.535+00:002015-03-06T00:48:00.535+00:00Where do the in and outs of the filter tie into? A...Where do the in and outs of the filter tie into? Also I didn't quite understand the calculator. Can you make a suggestion for the values on your daughter board. I'll take advise from anyone just I case John doesn't revisit this.Synsoundhttps://www.blogger.com/profile/14024171751270017980noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-41813292425931697542015-02-22T11:39:36.404+00:002015-02-22T11:39:36.404+00:00You need to use Germanium Diodes for this circuit,...You need to use Germanium Diodes for this circuit, use some 1n34a and see how it works out. The original also used Germanium diodesZombie11https://www.blogger.com/profile/03292363061955660728noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-2394777660559237672015-02-19T22:25:35.399+00:002015-02-19T22:25:35.399+00:00in this circuit in particular i used silicon diode...in this circuit in particular i used silicon diodes 1n4148.... could be the reason of the choppy sound????Anonymoushttps://www.blogger.com/profile/16023896441480929011noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-35669843274227358392015-02-19T04:34:46.235+00:002015-02-19T04:34:46.235+00:00i've made the circuit and works almost fine......i've made the circuit and works almost fine.... thank you!!!! that "almost" is because when i leave ringing some chord, the sound starts to choppy at the end of the sustain.... it is normal or could be something wrong in my circuit???? i think maybe could be a capacitor in bad shape or something like that.... i'll waiting for your answer.... and thank you again!!!!Anonymoushttps://www.blogger.com/profile/16023896441480929011noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-47813224829577265562014-12-14T11:14:56.456+00:002014-12-14T11:14:56.456+00:00http://tagboardeffects.blogspot.gr/2012/02/offboar...http://tagboardeffects.blogspot.gr/2012/02/offboard-wiring.html<br /><br />http://tagboardeffects.blogspot.gr/2012/04/vero-build-guide.htmlξεναγός νεκρόποληςhttps://www.blogger.com/profile/13463939372683232133noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-91145822612002806442014-12-14T03:05:51.049+00:002014-12-14T03:05:51.049+00:00Does anyone have an offboard wiring diagram for th...Does anyone have an offboard wiring diagram for this? I've seen a few gut shots but I can't quite make it all out. Thanks in advance!Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-68820897593031867532014-08-05T19:42:04.677+01:002014-08-05T19:42:04.677+01:00thanks. I use a brother p-touch labeler for my ped...thanks. I use a brother p-touch labeler for my pedals.johnkhttps://www.blogger.com/profile/00643996045674470081noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-92057374121507006072014-08-05T19:39:00.831+01:002014-08-05T19:39:00.831+01:00beautiful work!
with what method are you printing...beautiful work! <br />with what method are you printing the logos on it ?Anonymoushttps://www.blogger.com/profile/13269941548524494036noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-60241480365818053482014-07-19T13:06:30.666+01:002014-07-19T13:06:30.666+01:00Cool! Thanks a lotCool! Thanks a lotfuzzheadhttps://www.blogger.com/profile/06578098289027731560noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-74969091116187598592014-07-19T12:52:02.710+01:002014-07-19T12:52:02.710+01:00Just remove the Tone pot, switch and wiring, and m...Just remove the Tone pot, switch and wiring, and make a link between the Sw1 and Sw2 connections on the board.IvIarkhttps://www.blogger.com/profile/08416945174853142251noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-60794230916786189042014-07-19T12:29:51.353+01:002014-07-19T12:29:51.353+01:00Built it, what a monster! How do I omit the tone s...Built it, what a monster! How do I omit the tone switch (which is quite useless IMHO)?fuzzheadhttps://www.blogger.com/profile/06578098289027731560noreply@blogger.com