tag:blogger.com,1999:blog-6847048658257278783.post2259950213462647238..comments2024-03-29T01:36:12.851+00:00Comments on Guitar FX Layouts: Dunlop JBF-3 Joe Bonamassa Fuzz FaceIvIarkhttp://www.blogger.com/profile/08416945174853142251noreply@blogger.comBlogger53125tag:blogger.com,1999:blog-6847048658257278783.post-49685094722946933622023-07-27T00:02:02.393+01:002023-07-27T00:02:02.393+01:00This is my first vero build, coming from kits. Tha...This is my first vero build, coming from kits. Thanks for making this blog!<br /><br />1. For all intents and purposes, "-9v" connects to positive lug on the dc jack and "+ve gnd" connects to the ground lug, correct?<br /><br />2. Can I connect the grounded pot lugs to the grounded strip (the bottom strip connected to "+ve gnd")? Or where do those usually go? Davishttps://www.blogger.com/profile/12988218354919625410noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-66127275034652975622022-06-17T22:23:58.392+01:002022-06-17T22:23:58.392+01:00The trimpot is just being used as a variable resis...The trimpot is just being used as a variable resistor. It's not splitting the signal, just altering the resistance in the circuit to the collector. VegasVaaphttps://www.blogger.com/profile/13608550882598383734noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-64132210966054098062022-03-23T08:24:55.594+00:002022-03-23T08:24:55.594+00:00The red squares with dots in are where you cut the...The red squares with dots in are where you cut the copper track. For example, I use a small twist drill that came with a printer ink refilling kit. SWhttps://www.blogger.com/profile/04012077863633210810noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-32339245612376413162021-11-19T05:52:28.098+00:002021-11-19T05:52:28.098+00:00Im new in all of this, what are those red squares ...Im new in all of this, what are those red squares with red dots inside for? ThanksTheLordOfNoria327https://www.blogger.com/profile/11578273108418455582noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-443106502436401632021-11-07T18:05:32.580+00:002021-11-07T18:05:32.580+00:00Hi, do u have the schematic for this pedal??Hi, do u have the schematic for this pedal??Anonymoushttps://www.blogger.com/profile/06048628119465654878noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-13002244835674037632019-03-14T19:10:29.820+00:002019-03-14T19:10:29.820+00:00moved a 18p cap towards q2 to eliminate phenomens ...moved a 18p cap towards q2 to eliminate phenomens because of the leakage of the transistors used in my original dunlop unit. also measured q1 higher than 0.9V and q2 to 4.25V. now its pure. gematherhttps://www.blogger.com/profile/10661025463506237406noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-86576172126381941512018-02-03T13:48:42.943+00:002018-02-03T13:48:42.943+00:00Hey, this would be my first build. I've breadb...Hey, this would be my first build. I've breadborded following this layout (difference from schematic is that 1M resistor from input to ground), but how is this supposed to work if 1 leg on each trimpot is not going to ground?<br /><br />Am I missing something?Anonymoushttps://www.blogger.com/profile/05902729104315992234noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-30553406331672128502017-12-04T09:45:15.126+00:002017-12-04T09:45:15.126+00:00I just do not get it. Q1 is set on -0.9V on the co...I just do not get it. Q1 is set on -0.9V on the collector, but I get -9V on the collector of Q2. I measure 8.2k (the 3k16 and trimpot) between the collector and the 332R resistor. I have -9.1 V coming in, -9V after the 332R and then -9V on the collector of Q2. I measured no shorts with my multimeter, so what else could be wrong? Q2 Emitter is -0.78V and Base is -0.88V. I know someone will say a short and I will keep looking, but I am asking you guys for an alternative mistake I could have made.Arnold Dikstaalhttps://www.blogger.com/profile/00591790612241477571noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-18609959518927461222017-10-24T22:28:20.573+01:002017-10-24T22:28:20.573+01:00Any tips on how to best bias it?Any tips on how to best bias it?Arnold Dikstaalhttps://www.blogger.com/profile/00591790612241477571noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-23411991790615714102017-07-07T20:33:46.334+01:002017-07-07T20:33:46.334+01:00Yup. Ground is always zero volts. It's the pol...Yup. Ground is always zero volts. It's the polarity of the supply that can be perceived as negative or positive. Thus, it's not exactly incorrect to use terms "positive ground" or "negative ground". It's correct when relationship of the supply is taken into account. So Dmitro, you're correct and incorrect at the same time.<br /><br />Take a look at Mark's explanation post.<br />http://tagboardeffects.blogspot.fi/2014/08/negative-and-positive-ground-effects.html<br />+mmirosolhttps://www.blogger.com/profile/02400327798106357876noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-466821359858996942017-07-07T18:41:40.552+01:002017-07-07T18:41:40.552+01:00This comment has been removed by the author.sky.fionhttps://www.blogger.com/profile/16756047383919653097noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-57579069810285033062017-07-07T13:06:42.048+01:002017-07-07T13:06:42.048+01:00Positive ground? Ground is always zero, it can'...Positive ground? Ground is always zero, it can't be positive, this circuit uses negative pover source. Who put such mistakes on schematc?asenthttps://www.blogger.com/profile/15340878716370733740noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-49246517038436515062016-01-28T05:14:04.655+00:002016-01-28T05:14:04.655+00:00This comment has been removed by the author.sky.fionhttps://www.blogger.com/profile/16756047383919653097noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-86648735065993508202016-01-28T01:13:53.695+00:002016-01-28T01:13:53.695+00:00Could the Tayda electronics fuzz face kit be used ...Could the Tayda electronics fuzz face kit be used to do this build with a few changes in components? Or is there another ready made kit that I could just add the different resistors to? I live in Australia so try to limit the number of places I order stuff from in order to not get killed on the shipping.Anonymoushttps://www.blogger.com/profile/05641526325319463539noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-53431384499600338042015-10-11T15:00:09.670+01:002015-10-11T15:00:09.670+01:00template for JBF-3;
http://s15.postimg.org/groimsj...template for JBF-3;<br />http://s15.postimg.org/groimsjdn/bonamassa_yellow_black_3.pngMeekhttps://www.blogger.com/profile/15435197202468367637noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-6539412517538168692015-10-04T18:19:50.460+01:002015-10-04T18:19:50.460+01:00built it and love it, i used 2 of my best matched ...built it and love it, i used 2 of my best matched AC128 and daisy chained it,<br />sound just as great as in the YT vid<br />and i went for a black model ;)<br /><br />http://s7.postimg.org/rrx2969gb/IMG_0494.jpg<br /><br />http://s22.postimg.org/erwm1892p/IMG_0475.jpg<br /><br />Meekhttps://www.blogger.com/profile/15435197202468367637noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-29089062265105556202015-09-24T11:11:20.629+01:002015-09-24T11:11:20.629+01:00I could only get a 20k trimmer instead of the 25k ...I could only get a 20k trimmer instead of the 25k the bias for Q1 collector only gets down to 1.2V - this may be why Im left with a quite bottom heavy and no top fuzz - not sure? its nice with my guitar vol backed off. I also could only source a 3k series res for Q1, but the bias is achievable.<br /><br />Im going to try replacing my 20k trimmer with a 50k and see if I can get more resistance to bring the bias down - logical really<br /><br />great looking circuit though, especially with some big russian trannies in it.Anonymoushttps://www.blogger.com/profile/02143414251921495308noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-11102600933404842232015-09-21T03:18:32.205+01:002015-09-21T03:18:32.205+01:00Nevermind, I accidentally used a 330k instead of 3...Nevermind, I accidentally used a 330k instead of 330r.Brandon Bhttps://www.blogger.com/profile/17054000154539243713noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-62502866339029794992015-09-20T16:28:05.899+01:002015-09-20T16:28:05.899+01:00Having a tough time with this circuit. I built it ...Having a tough time with this circuit. I built it on strip board with a voltage inverter on board. With no transistors in the socket I'm getting -9v on the collector of both Q1 and Q2 no matter where the trimmers are set. With transistors in the socket I'm getting about -.5v to .9v on the collector of Q1 and Q2 depending on where the trimmers are set. I used a 30k trim instead of a 25k trim, but everything else is the same as the layout. I'm gonna set this one aside for a little bit and come back with fresh eyes, but any help is appreciated.Brandon Bhttps://www.blogger.com/profile/17054000154539243713noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-52647295995461183722015-09-02T19:37:44.354+01:002015-09-02T19:37:44.354+01:00the only difference is that if you don't use a...the only difference is that if you don't use an inverter you will NOT be able to daisy chain this pedal with other non-positive ground effects.Zachhttps://www.blogger.com/profile/00044917566185720896noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-37807867112763344252015-07-26T22:56:25.127+01:002015-07-26T22:56:25.127+01:00I love this! I have it with a negative voltage inv...I love this! I have it with a negative voltage inverter, and I can daisy chain it fine. A buffer before it makes a huge difference. I prefer it with one before it, it has much more hair that way. <br />It sounds great in many bias settings, too. I may build it with bias knobs instead of trimpots, next.Chrishttps://www.blogger.com/profile/10079188115402423809noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-18490263857774489572015-05-16T13:30:11.496+01:002015-05-16T13:30:11.496+01:00q2 is gt308V not gt308b , q2 c 4.5V Greetings fro...q2 is gt308V not gt308b , q2 c 4.5V Greetings from Russia!sky.fionhttps://www.blogger.com/profile/16756047383919653097noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-66374772077017353142014-12-22T22:02:50.550+00:002014-12-22T22:02:50.550+00:00pnp sure, like in originalpnp sure, like in originalAnonymoushttps://www.blogger.com/profile/02026752509657065618noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-60630305998647237442014-12-22T22:02:04.891+00:002014-12-22T22:02:04.891+00:00This comment has been removed by the author.Anonymoushttps://www.blogger.com/profile/02026752509657065618noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-27769700770883258872014-12-22T12:04:28.372+00:002014-12-22T12:04:28.372+00:00Are the transistors PNP or NPN?Are the transistors PNP or NPN?Anonymoushttps://www.blogger.com/profile/05792285644398580559noreply@blogger.com