tag:blogger.com,1999:blog-6847048658257278783.post6742249133309603579..comments2024-03-29T01:36:12.851+00:00Comments on Guitar FX Layouts: BJFE / Bearfoot Model GIvIarkhttp://www.blogger.com/profile/08416945174853142251noreply@blogger.comBlogger45125tag:blogger.com,1999:blog-6847048658257278783.post-80244478556009219232021-09-20T17:30:21.386+01:002021-09-20T17:30:21.386+01:00Has the power resistor R15 @ 470R been confirmed? ...Has the power resistor R15 @ 470R been confirmed? Seems odd as every other Bearfoot pedal with this same topology indicate 47R.<br /><br />In my build R15 @ 470R drops the supply voltage down to 8.2v, where 47R gives around 9.1v<br /><br />And considering the other versions all have the same R13 Q3 drain resistor value of 5k6, leads me to think R15 in this pedal should also be 47R.<br /><br />Also, with the 9.1v supply, I'm getting the 2n5952 biased at 5.3v. I needed to bump up the drain resistor to 6.8k to get closer to 4.5v bias.<br /><br />Still messing with it to hear what combo sounds best, but hoping someone can offer some insight.MAOhttps://www.blogger.com/profile/11710844420932336422noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-24302956388081550802021-09-19T06:27:57.178+01:002021-09-19T06:27:57.178+01:00This comment has been removed by the author.MAOhttps://www.blogger.com/profile/11710844420932336422noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-8825851906388217892021-09-19T06:26:17.064+01:002021-09-19T06:26:17.064+01:00Hey HamishR, I know its been a while, but any chan...Hey HamishR, I know its been a while, but any chance you measured the drain resistor and voltage for the output 5952?MAOhttps://www.blogger.com/profile/11710844420932336422noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-47786723473037435582019-01-17T03:40:55.607+00:002019-01-17T03:40:55.607+00:00I recently rejigged the layout for myself slightly...I recently rejigged the layout for myself slightly (not much) and built this again. It works so well with my current rig that I actually went and bought an original to see how close it sounds. Well it sounds virtually identical! I was curious because i always found that the "C" control ("comp" on my original) didn't seem to do a great deal on my build. Happy to report that my build performs exactly as the original does - "C" does very little. It does something, but I would be hard pressed to say that I prefer it at one setting over another. It seems that a lot of Bjorn's excellent designs have a knob which does very little.<br /><br />The only difference I have found so far with components is that my original Bearfoot has three 2N5952, no 2N5457. It doesn't seem to affect the sound a great deal.<br /><br />This is probably my favourite BJF pedal.HamishRhttps://www.blogger.com/profile/05650034409087553720noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-65803631730022990002017-04-26T02:21:54.612+01:002017-04-26T02:21:54.612+01:00I wouldn't really bet on the LED's being t...I wouldn't really bet on the LED's being the culprits here -I think it could be a series of other things, like: misbiased transistors, a solder bridge, a bad pot or some other type of building mistake, like a component soldered on the wrong place. I'd also try different op-amps, just in case. Iagohttps://www.blogger.com/profile/13478141026000247956noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-86730367959923319482017-04-26T02:18:48.745+01:002017-04-26T02:18:48.745+01:00Yes, the white marking means ground (shortest leg ...Yes, the white marking means ground (shortest leg of a LED/flat side of the plastic casing). Even if you had soldered both LED's "backwards" it would still work properly (meaning, left-side LED with ground facing north and right-side one with ground facing south). Iagohttps://www.blogger.com/profile/13478141026000247956noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-73168891626172879052017-04-24T18:57:06.716+01:002017-04-24T18:57:06.716+01:00Also thought that I should mention that I used 5mm...Also thought that I should mention that I used 5mm red LEDS in place of the 3mm (have some red 3mm available, but can't figure out orientation since both legs are the same length and there isn't any internal plate visible).Daniel Davishttps://www.blogger.com/profile/16122728452542236431noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-39663764612424448202017-04-23T15:41:21.131+01:002017-04-23T15:41:21.131+01:00Just finished the build and it sounds great, but I...Just finished the build and it sounds great, but I get a high pitched squealing feedback with the gain above 3 o clock. Anyone have any ideas? Could my LEDs be in backwards (used the side with the lighter patch as the - side, not sure if that is right)?Daniel Davishttps://www.blogger.com/profile/16122728452542236431noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-46816965225234640142017-01-12T03:39:54.028+00:002017-01-12T03:39:54.028+00:00Could be a bad pot too.Could be a bad pot too.Iagohttps://www.blogger.com/profile/13478141026000247956noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-25319780914435000202017-01-09T20:41:38.271+00:002017-01-09T20:41:38.271+00:00I completed this and it works as expected but... o...I completed this and it works as expected but... only when I have the nature knob turned completely counter clockwise. If I turn it up at all there's a constant feedback noise. I'm guessing it's something with the wiring but not sure.Adamhttps://www.blogger.com/profile/07510364454552392708noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-35679502434880263792016-02-24T09:11:43.836+00:002016-02-24T09:11:43.836+00:00This comment has been removed by the author.Frederik Eriksonhttps://www.blogger.com/profile/05133197265918130589noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-64370269019735864172016-02-23T15:54:26.662+00:002016-02-23T15:54:26.662+00:00it's just one answer above! 2n5457 j201...it's just one answer above! 2n5457 j201...ξεναγός νεκρόποληςhttps://www.blogger.com/profile/13463939372683232133noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-80086801531994996652016-02-23T11:07:31.458+00:002016-02-23T11:07:31.458+00:00Hi there,
Can someone post the voltages and tell i...Hi there,<br />Can someone post the voltages and tell if he could sucessfully use a drop-in for the 2N5952 that I definitely cannot get hold of?<br />Thanks a lot!Frederik Eriksonhttps://www.blogger.com/profile/05133197265918130589noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-3899367424625792332014-06-10T14:05:22.090+01:002014-06-10T14:05:22.090+01:00Just use another 2N5457, or if you have a few diff...Just use another 2N5457, or if you have a few different types like J201 try them tooIvIarkhttps://www.blogger.com/profile/08416945174853142251noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-51232372452584654612014-06-10T12:57:31.758+01:002014-06-10T12:57:31.758+01:00Hallo, I m looking for the parts to build this one...Hallo, I m looking for the parts to build this one, but I cant find 2n5952 as easy as other FETs, mad professor seems to be a little picky about their parts, does it? So, should I ask Musikding for that FET, or there are other FET that can replace that one? Some favourite maybe?Sergiohttps://www.blogger.com/profile/14844490869027694680noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-9180424279221058882014-05-15T14:02:45.610+01:002014-05-15T14:02:45.610+01:00I like the sound of this one,but how can I make it...I like the sound of this one,but how can I make it brighter? the C knob turned all the way up it just starts to get to the right bright highs.is there a way to add a bright switch to this circuit?or what caps control the treble? maybe I can swap out different values to find what I likeAnonymoushttps://www.blogger.com/profile/00436582071248972126noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-37709261652236434682014-03-06T19:10:42.525+00:002014-03-06T19:10:42.525+00:00thanks m.thanks m.Anonymoushttps://www.blogger.com/profile/17342838527556118967noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-627182093888782762014-03-04T17:55:09.085+00:002014-03-04T17:55:09.085+00:00That's W-taper, the kind that's used a lot...That's W-taper, the kind that's used a lot on Tubescreamers.<br />http://www.taydaelectronics.com/potentiometer-variable-resistors/rotary-potentiometer/w-taper/20k-ohm-w-taper-w20k-tone-control-potentiometer-with-center-detent.html<br />+mmirosolhttps://www.blogger.com/profile/02400327798106357876noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-47758637048348295002014-03-04T17:35:21.401+00:002014-03-04T17:35:21.401+00:00What means 20K W? Is it a reverse poti (Alpha 20KC...What means 20K W? Is it a reverse poti (Alpha 20KC)?Anonymoushttps://www.blogger.com/profile/17342838527556118967noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-62472272591864676042013-10-18T12:12:13.556+01:002013-10-18T12:12:13.556+01:002610 ohm. There usually are some of these "no...2610 ohm. There usually are some of these "non-standard" values on BJFE designs. I bet you'll be fine with 2K7.<br />+mmirosolhttps://www.blogger.com/profile/02400327798106357876noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-37069421894230308182013-10-18T11:01:51.100+01:002013-10-18T11:01:51.100+01:00Hi,
what is R=2K61? 2K6+1 aka 2K7?Hi,<br /><br />what is R=2K61? 2K6+1 aka 2K7?Anonymoushttps://www.blogger.com/profile/17342838527556118967noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-89223235504623799292013-09-24T11:53:08.596+01:002013-09-24T11:53:08.596+01:00Thanks for the link!
GThanks for the link!<br /><br />GGeezerhttps://www.blogger.com/profile/07775756981117867413noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-8893789008480085472013-09-24T04:37:02.289+01:002013-09-24T04:37:02.289+01:00from mouser:
http://www.mouser.com/catalog/catalo...from mouser:<br /><br />http://www.mouser.com/catalog/catalogusd/646/178.pdfjohnkhttps://www.blogger.com/profile/00643996045674470081noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-17074199980256221532013-09-24T04:20:31.177+01:002013-09-24T04:20:31.177+01:00John, where do you get the indicator/pilot lamps t...John, where do you get the indicator/pilot lamps that you use on your pedals?<br /><br />TIA, GGeezerhttps://www.blogger.com/profile/07775756981117867413noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-47660646171159962022013-09-20T08:59:09.949+01:002013-09-20T08:59:09.949+01:00ahh the joys of being a pedal builder...ahh the joys of being a pedal builder...Felixhttps://www.blogger.com/profile/06574738335557013908noreply@blogger.com