tag:blogger.com,1999:blog-6847048658257278783.post2661178677482600765..comments2024-03-29T01:36:12.851+00:00Comments on Guitar FX Layouts: Diefet - Diezel VH4S SimulatorIvIarkhttp://www.blogger.com/profile/08416945174853142251noreply@blogger.comBlogger44125tag:blogger.com,1999:blog-6847048658257278783.post-77476222259260631252020-04-29T00:05:21.662+01:002020-04-29T00:05:21.662+01:00hello, does anyone have the schematic that this ve...hello, does anyone have the schematic that this veroboard was based off? Signal coming through but very low gain. I've tried both passive and active guitar just to make sure it isn't an impedence issue. Thanks!pedalshttps://www.blogger.com/profile/10664826804556848143noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-39229945941359727882018-07-10T12:29:31.719+01:002018-07-10T12:29:31.719+01:00I biased this one using my meter to start off with...I biased this one using my meter to start off with but ended up doing it by ear to get it how I liked it. Hit an open D chord then trimmed for maximum gainage!! I also knocked the bass trimmer back a touch. I'm keen to try getting this one in a 125B!Thommohttps://www.blogger.com/profile/08323108483853432376noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-35252226802205030902016-08-18T14:22:54.361+01:002016-08-18T14:22:54.361+01:00Just built this pedal. First time around I got byp...Just built this pedal. First time around I got bypass signal but nothing when the pedal was enagaged. Couldn't find the problem so I scrapped it and started from scratch paying extra care to make sure everything was correct. Same result, I get a bypass signal but nothing when the pedal is engaged. I rechecked the board twice, ticked off all the components, jumpers, cuts, pot wiring etc to the vero diagram and all is in order. Checking my input and output cables, when the pedal is engaged I get continuity from sleeve to sleeve but no continuity from tip to tip. I checked the voltages on the ICs and the transistors powering the pedal with a 9v power supply and they look OK (but I am really not sure what I am looking for, I can post voltages if necessary). Checked my switch wiring and that looks OK. Tonight, I tried to audio probe the circuit for a few minutes (as with the voltages I don't really know what I am doing here but I thought I would give it a go). Miraculously when I retried the pedal I suddenly got a signal when the pedal was engaged. But the gain is very low, like an OD instead of full bore like the Diefet is supposed to be. Anyone know what the problem could be?lleehttps://www.blogger.com/profile/17953117674109513180noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-84648542230611933392016-04-17T21:36:26.693+01:002016-04-17T21:36:26.693+01:00Supply voltage is 18V.
So, jfets should be set at ...Supply voltage is 18V.<br />So, jfets should be set at 9-10V on the drain.Anonymoushttps://www.blogger.com/profile/04645598834124213525noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-43736927008437115242016-04-15T01:58:51.945+01:002016-04-15T01:58:51.945+01:00I just received this pedal on trade and am questio...I just received this pedal on trade and am questioning the bias of the JFEts. What is considered the "supply voltage"? Is it pin 8 of the upper left IC? Should all 4 JFET drains then be the same voltage?Anonymoushttps://www.blogger.com/profile/15081324837249406028noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-67957151347394425972016-02-29T19:18:45.042+00:002016-02-29T19:18:45.042+00:00also missing is the diode 1N4004 also missing is the diode 1N4004 Anonymoushttps://www.blogger.com/profile/04645598834124213525noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-20662377902895434582016-02-29T17:33:27.816+00:002016-02-29T17:33:27.816+00:00Hi,
I have a few questions, on the 18V schematic t...Hi,<br />I have a few questions, on the 18V schematic there are listed 3x10uf 25v and 2x100uf caps, but on your vero schematic you entered 3x100uf and 2x10uf caps.<br /><br />Also, on the 18V schematic there is a resistor 10 ohm 2w between Diode 3 and diode 5.<br />Could you help pleaseAnonymoushttps://www.blogger.com/profile/04645598834124213525noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-61245477486630778742016-02-29T17:26:37.606+00:002016-02-29T17:26:37.606+00:00This comment has been removed by the author.Anonymoushttps://www.blogger.com/profile/04645598834124213525noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-80831588117279812592016-02-10T23:20:12.749+00:002016-02-10T23:20:12.749+00:00can you post a photo of your board?can you post a photo of your board?Sensei Timhttps://www.blogger.com/profile/04338775054703359643noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-118574895907671362016-02-10T23:15:39.530+00:002016-02-10T23:15:39.530+00:00Oh and I replaced the 220K to be sure.Oh and I replaced the 220K to be sure.Anonymoushttps://www.blogger.com/profile/07106443745251317951noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-15990884139632340352016-02-10T23:14:49.690+00:002016-02-10T23:14:49.690+00:00Is there any chance that someone could trace the s...Is there any chance that someone could trace the signal path here for me? I have been over this one a lot and I am sure that my board was made right and the components are in correctly. I have been probing for a couple of hours now and I am not getting signal past the first gain stage. I have signal through the gain pot and into the 3rd row from bottom up to the 220k beside Q2 but after that I have nothing. Bottom side of the 220K has signal but the other side does not. My circuit knowledge is shallow so I can not see where to go from there.<br />Please Help!!!!Anonymoushttps://www.blogger.com/profile/07106443745251317951noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-67794584107806977862015-09-26T16:21:50.057+01:002015-09-26T16:21:50.057+01:00This comment has been removed by the author.Alltrax74https://www.blogger.com/profile/13079701857494829507noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-64160965773768299882015-05-24T06:25:16.470+01:002015-05-24T06:25:16.470+01:00I love this pedal. I didn't win any awards for...I love this pedal. I didn't win any awards for compactness in a BB, but sometimes easy to build wins. One thought though as a started doing the artwork for the box, shouldn't this be a VH4 without the S? I think the S is on the stereo model and not on the mono model. Mojo321https://www.blogger.com/profile/09952527923804212583noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-53324915633575034592015-04-30T20:55:42.933+01:002015-04-30T20:55:42.933+01:00Once I finally got it all working it turned out to...Once I finally got it all working it turned out to be crystal clear - no farting. I hasd tried grounding my volume pot to the board (a few different ways) but somehow it never sounded great until I grounded it off the board. Also, once I started the biasing with the 3rd J201 it got better. I don't know if i had other problems along the way but it sounds amazing now. https://soundcloud.com/paulmotter/diefet2motterpaulhttps://www.blogger.com/profile/15536330842070250774noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-37186850558048652922015-04-25T04:28:51.515+01:002015-04-25T04:28:51.515+01:00I didn't find this pedal to be farty sounding ...I didn't find this pedal to be farty sounding at all.<br /><br />http://youtu.be/f3k_WKAzksk<br />Sensei Timhttps://www.blogger.com/profile/04338775054703359643noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-9820981515254082282015-04-25T03:59:56.706+01:002015-04-25T03:59:56.706+01:00Also - I just tried some PN4393 fet trannys in thi...Also - I just tried some PN4393 fet trannys in this, and it is an improvement. I had a feeling those 4393 were better than J201s - a little more gain (forward voltage?) - and they are available and not that expensive.motterpaulhttps://www.blogger.com/profile/15536330842070250774noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-52262641144287143092015-04-25T02:17:57.996+01:002015-04-25T02:17:57.996+01:00I finally got this working right with the second b...I finally got this working right with the second build. With seven pots and 5 trimpots - all of them interactive, you have to be sure you have this right. It is a very sensitive circuit - to biasing and pot positions. Even the TL072 - I tried to use an 082 and it changed the whole dynamic - the tone pots were completely different. These opamps are not always interchangeable.<br /><br />Anyway - the pedal sound pretty good. The first had very low gain and I don;t know why. This one is a lot better for gain although the gain pot has very little play. The circuit is farty by nature as the guitar dies out, but when you playing loud it sounds tight and very punchy. I would like to smooth out some of the gating effect - maybe a few different FETs will work better. I will report back. motterpaulhttps://www.blogger.com/profile/15536330842070250774noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-78794664749342223542014-07-30T22:01:18.879+01:002014-07-30T22:01:18.879+01:00Done. Very nice. Room for an extra pair of sox in ...Done. Very nice. Room for an extra pair of sox in a 125b. Anonymoushttps://www.blogger.com/profile/02519375275213556637noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-84867741373797407052014-07-30T19:15:44.104+01:002014-07-30T19:15:44.104+01:00The 470u will be fine at 16V, it's the 100u ne...The 470u will be fine at 16V, it's the 100u next to it and the other 100u's that will need to be 25VIvIarkhttps://www.blogger.com/profile/08416945174853142251noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-30165379659228515842014-07-30T18:39:21.201+01:002014-07-30T18:39:21.201+01:00Thanks Mark.
Will a (16v) 470u cap work or will i...Thanks Mark. <br />Will a (16v) 470u cap work or will it just go poof? Anonymoushttps://www.blogger.com/profile/02519375275213556637noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-6103908758754984902014-07-30T08:38:24.629+01:002014-07-30T08:38:24.629+01:00Yup. It does. The other reason any circuit would h...Yup. It does. The other reason any circuit would have 7660S is bipolar +/- supply. But in this case, 18V.<br />+mmirosolhttps://www.blogger.com/profile/02400327798106357876noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-23950349174213554752014-07-30T02:02:51.619+01:002014-07-30T02:02:51.619+01:00Does the 7660s mean this runs at 18v?Does the 7660s mean this runs at 18v?Anonymoushttps://www.blogger.com/profile/02519375275213556637noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-23549677820959024422014-07-27T05:31:08.823+01:002014-07-27T05:31:08.823+01:00Just built this tonight and can confirm that this ...Just built this tonight and can confirm that this is a freakin beast. Also confirming that the presence and deep knobs are backwards.<br /><br />Another thing that I noticed is that unity gain for me is at around 2-3 o'clock. Don't know if going to a 250k level pot will fix this or not.<br /><br />With the deep control, I'm thinking of replacing the pot with an on/on/on switch with 0, 5k and 10k resistors. The knob covers a lot of range, but maybe 3 presets would be easier.Sensei Timhttps://www.blogger.com/profile/04338775054703359643noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-48907452167979994472014-07-09T23:34:54.304+01:002014-07-09T23:34:54.304+01:00Anyone build this with success? Verified?Anyone build this with success? Verified?Anonymoushttps://www.blogger.com/profile/02519375275213556637noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-49458314434823338342014-06-14T15:51:31.031+01:002014-06-14T15:51:31.031+01:00They look good to me and I've bought all mine ...They look good to me and I've bought all mine as eBay cheapies. You're so well protected as a buyer on eBay that there really no risk in buying. Just stick them all in a socketed effect or charge pump you've built to test when they arrive and you'll know if they're all ok.IvIarkhttps://www.blogger.com/profile/08416945174853142251noreply@blogger.com