tag:blogger.com,1999:blog-6847048658257278783.post3696750275839412273..comments2024-03-13T04:13:52.242+00:00Comments on Guitar FX Layouts: Ramble FX Marvel DriveIvIarkhttp://www.blogger.com/profile/08416945174853142251noreply@blogger.comBlogger110125tag:blogger.com,1999:blog-6847048658257278783.post-14427297566208896852022-12-18T22:02:38.410+00:002022-12-18T22:02:38.410+00:00The 2n2s at the output stage are cutting way too m...The 2n2s at the output stage are cutting way too much high end, I recommend anyone building this circuit socket those, put them on a dpdt switch, or just follow the 470pf recommendation. Or, it sounds ok with no capacitors there to me, I like the added high-end sizzle and adding a 'presence' high-cut knob to control it.Garvanhttps://www.blogger.com/profile/02424256812483505526noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-28074774968474724962019-03-30T05:34:22.059+00:002019-03-30T05:34:22.059+00:00Yes exactly!
I tried the substitute of the two 2,2...Yes exactly!<br />I tried the substitute of the two 2,2nf (bottom right)<br />I put some 470pf instead; way better like this BlondinLuxhttps://www.blogger.com/profile/07023768101855102782noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-58058411872518422922019-03-30T02:31:58.418+00:002019-03-30T02:31:58.418+00:00That's great. Jfets can be so annoying, some t...That's great. Jfets can be so annoying, some times they simply won't work in a particular build, but then they do work in another... Iagohttps://www.blogger.com/profile/13478141026000247956noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-7079201851120403442019-03-29T20:15:33.698+00:002019-03-29T20:15:33.698+00:00Ok some news;)
I ordered a bunch of J201 (TO92 on...Ok some news;)<br /><br />I ordered a bunch of J201 (TO92 ones)<br />Tweaking a bit and now it's working great!<br /><br />I will try the 2n2's to 470pf mod<br />Like this it's too dark for me!BlondinLuxhttps://www.blogger.com/profile/07023768101855102782noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-90410615844711660692019-03-10T00:25:07.322+00:002019-03-10T00:25:07.322+00:00Thx Lago for your help!
So I tried a bunch of J20...Thx Lago for your help!<br /><br />So I tried a bunch of J201,2N5457 all have 0v to the drain.<br />I tried some 2SK117 and 2SK30 and I have 2v to the drain but the sound is really poor.<br />Apparently I don't have mistake in my circuit so I have to find the right value with a J201 I guess ?BlondinLuxhttps://www.blogger.com/profile/07023768101855102782noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-43489747695147328172019-03-09T05:03:44.248+00:002019-03-09T05:03:44.248+00:00Possibly, the problem is near that Q3. First, try ...Possibly, the problem is near that Q3. First, try other Jfets in that spot. Second, recheck your trace cuts and any possible unwanted bridges. Recheck your links. Retry the Jfets. I also built mine from the 2nd layout and it works fine. Iagohttps://www.blogger.com/profile/13478141026000247956noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-64873278078320455272019-03-08T23:39:16.236+00:002019-03-08T23:39:16.236+00:00Oh and I used some smd MMBFJ201Oh and I used some smd MMBFJ201BlondinLuxhttps://www.blogger.com/profile/07023768101855102782noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-83502146654498325252019-03-08T23:37:44.650+00:002019-03-08T23:37:44.650+00:00Hi everyone !
I built the second layout but have s...Hi everyone !<br />I built the second layout but have some issues.<br /><br />I have no sound :(<br />I have everything checked and I have no error(I supposed)<br /><br />I set the bias to get ~ 4,5v to the drain of Q1,2 and 5<br />on the other hand I have 0v to the drain of Q3<br />I tried several JFet without success.<br /><br />would you have an idea of the problem?<br />Thx for your help BlondinLuxhttps://www.blogger.com/profile/07023768101855102782noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-70239564102827302192018-11-12T22:32:01.646+00:002018-11-12T22:32:01.646+00:00Update: The MMBFJ201's made no difference. I h...Update: The MMBFJ201's made no difference. I hoped they would get rid of some hiss but it's the same as before. But that's completely tolerable when aiming for a mild crunchy overdrive sound. (In Hi-Gain territory it's really nagging me)Eli_Klngsmkthttps://www.blogger.com/profile/04271664305312932268noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-36269677029446656252018-09-29T22:36:03.634+01:002018-09-29T22:36:03.634+01:00Just built this pedal and it sounds really good, p...Just built this pedal and it sounds really good, probably the most amp-sounding one I have. <br /><br />Used two 470p caps instead of the 2n2's at the bottom of the board to make the whole thing brighter (before the "normal" side was barely usable and "treble" was kinda balanced). I also added a Presence control with a 25k linear pot and 2n2 cap and that's great to eliminate some fizziness if necessary.<br /> <br />Probably the J201's I bought from the Bay aren't the real deal and out of curiosity I ordered some SMD ones and adapters. I will report if there are any differences soundwise.Eli_Klngsmkthttps://www.blogger.com/profile/04271664305312932268noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-59062955468274297182018-02-06T16:35:23.997+00:002018-02-06T16:35:23.997+00:00This comment has been removed by the author.Andrehttps://www.blogger.com/profile/14524174067233323780noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-7934935129222224362017-04-28T22:33:00.498+01:002017-04-28T22:33:00.498+01:00I built this thing v3 style with a presence contro...I built this thing v3 style with a presence control and 18v charge bump. Great circuit but I would like to increase the treble response overall. From what I read here, reducing the value of 2n2 off treble 2 might make that side brighter. Is that right? What would make the Normal side brighter? As it stand now, my presence control (20K/22nf) is not of much value. I'm running it wide open.etzeppyhttps://www.blogger.com/profile/17098731413786212979noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-13611001259901678252016-08-04T15:43:34.559+01:002016-08-04T15:43:34.559+01:00(sorry for my bad english) i'm having some pro...(sorry for my bad english) i'm having some problems with the treble volume pot: it only work reasonably weel in the first half of the taper. Than it cut the sound. Also it doesnt really add some noticeable treble content.<br /><br />The sound of my circuit is incredible. But it doesn't clean really well with the guitar's volume knob. It add some strange harmonics in the notes. Can someone help me? Anonymoushttps://www.blogger.com/profile/15198352443998562909noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-74902357108390994112016-04-30T16:37:01.021+01:002016-04-30T16:37:01.021+01:00what are the settings for each trimpot ?what are the settings for each trimpot ?guitarhttps://www.blogger.com/profile/04078769810989770551noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-68656301840009291272016-04-27T03:42:54.451+01:002016-04-27T03:42:54.451+01:00Built mine today. Excellent tone but got louder hu...Built mine today. Excellent tone but got louder hum when messing with q5 trimpot. Lowering it down, the hum is gone but also the volume. Any thoughts?Henriquehttps://www.blogger.com/profile/09421547450494722576noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-5861289852591458712015-10-23T21:28:22.377+01:002015-10-23T21:28:22.377+01:00I built this with BF245As and sounds really great ...I built this with BF245As and sounds really great as a stand alone drive on my solid state amp, and also produces some cool tones after my Meathead which is a cardinal point for me since I'm in a search for good drives/amp sims that do some post gain/break up stuff after a fuzz without annoying mid-hump mushiness. Love it!mooshttps://www.blogger.com/profile/06167698945811822615noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-56867976345186884382015-09-22T05:10:09.659+01:002015-09-22T05:10:09.659+01:00I was finally able to source some J201s and that f...I was finally able to source some J201s and that fixed my volume issue. Pedal is loud as hell now, so I guess MPF102s aren't good replacements for J201s then.<br /><br />A new issue however. I decided to build a second one but this time I used the vertical 15x20 layout and the normal channel is just barely there like others have mentioned. Makes me wonder if both layouts have been verified. Any successful builds out there with the vertical layout?Servant07https://www.blogger.com/profile/13952296525939782973noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-34530462623923165752015-08-19T17:37:02.178+01:002015-08-19T17:37:02.178+01:00Problems are solved. First, probably a bad JFET or...Problems are solved. First, probably a bad JFET or two. Then I boxed it and the treble volume starts working all weird, sounding "cranked up" all the time and making nasty noises - got that changed too. Gosh, never had so many problems with a single build. <br /><br />Yup, this is a great Marshall-type pedal and a fuzz face works awesome into it. I'm surprised by how little hum this pedal produces after boxed - at least for a circuit capable of such high gain levels. I still think the Plexi-Drive sounds better for low gain, chimey OD sounds but this one has it beat in every other area. Extremely recommended build.Iagohttps://www.blogger.com/profile/13478141026000247956noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-43651049628804053652015-08-17T07:45:28.819+01:002015-08-17T07:45:28.819+01:00Let me start by saying the circuit sounds awesome,...Let me start by saying the circuit sounds awesome, it really does.. while it worked! I had this wired to a test box and everything worked perfectly: loud master volume and both normal and treble volumes did their job just fine (I've watched many demos of this pedal). When I boxed the circuit the treble vol. didn't work anymore and the master lost most of it's volume - I could tell the normal vol. was still working across the range of the pot but the final output was very low, not even reaching unity with the amp when the master was cranked. So, unboxing the thing and wiring it back to the test box brought the treble vol. back, but still, the master volume keeps acting the same - SUPER quiet, not even reaching unity when @ max with both treble and normal vols. cranked. Some people mentioned the pedal being too quiet...I think we're having the same problem somehow. Has anyone found what was the issue?<br /><br />I've changed pots and messed with the trimpots to no avail. The JFETs are the same that worked originally and voltages are as per recommended on a previous post - just as when the pedal originally worked. I'm lost this time... I'll try changing the JFET's tomorrow and see. <br /><br />And BTW, someone was saying this circuit sounded mushy when fronted by a fuzz (what fuzz?)... mine soundED awesome, compressed in the right way, thick, creamy, no fizzy/mushy/synthy artifacts - a total winner with a Si Fuzz Face before it. At least, I had time to stack these two pedals! Iagohttps://www.blogger.com/profile/13478141026000247956noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-24489816537438619762015-08-10T07:28:22.692+01:002015-08-10T07:28:22.692+01:00Just finished this pedal and like everyone else ha...Just finished this pedal and like everyone else has said, it sounds amazing. Only issue I seem to be having is i'm not getting the loudness some have mentioned. I have to have the volumes up to at least 3/4 to get to unity gain. I tried tweaking the drain voltages, but it didn't really help. I did have to substitute some components, perhaps somebody could tell me if that is my issue? Here is what was swapped.<br /><br />Transistors are MPF102's<br />I used 220pF caps instead of 180pF<br />47k resistors instead of 50k (Should I have went up to 56k instead of down?)<br />1uF cap instead of 680nF<br />2.2uF cap instead of 1uF (I don't have polarized 1uF caps)<br />220uF cap instead of 330uF<br />50K log pot for master volume<br /><br />But like I said, it still sounds fantastic.Servant07https://www.blogger.com/profile/13952296525939782973noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-28529158470571608462015-08-10T05:55:03.483+01:002015-08-10T05:55:03.483+01:00those extra components are most likely for the rel...those extra components are most likely for the relayed bypass circuit and have nothing to do with the tone of the circuit when engaged.johnkhttps://www.blogger.com/profile/00643996045674470081noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-47818734082506718782015-08-10T04:18:18.804+01:002015-08-10T04:18:18.804+01:00I love the sound but in this video shows that has ...I love the sound but in this video shows that has 6 transistors and integrated ... is this so ? or is it another product ? Thank you!<br /><br />https://www.youtube.com/watch?v=BISRZEy4-JQLeandro Ghttps://www.blogger.com/profile/00485307729697857967noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-24466752120557962772015-08-09T01:08:03.783+01:002015-08-09T01:08:03.783+01:00nope.nope.johnkhttps://www.blogger.com/profile/00643996045674470081noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-90402420049807075992015-08-08T23:56:08.189+01:002015-08-08T23:56:08.189+01:00This circuit does not carry an integrated? This circuit does not carry an integrated? Karo Palacio - Make uphttps://www.blogger.com/profile/02502266128915608042noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-76542117594146000352015-02-23T01:53:05.187+00:002015-02-23T01:53:05.187+00:00Just built this one up and the treble volume sound...Just built this one up and the treble volume sounds great, but there is barely any output when I decrease the treble volume to zero and then max the normal volume. <br />Voltages:<br />Q1: 4.1 V<br />Q2: 5.0 V<br />Q5: 5.45JB83https://www.blogger.com/profile/11099067934822169973noreply@blogger.com