tag:blogger.com,1999:blog-6847048658257278783.post1052183261108213124..comments2024-03-29T01:36:12.851+00:00Comments on Guitar FX Layouts: JFET MatcherIvIarkhttp://www.blogger.com/profile/08416945174853142251noreply@blogger.comBlogger39125tag:blogger.com,1999:blog-6847048658257278783.post-29141424769824653662017-09-01T20:57:50.089+01:002017-09-01T20:57:50.089+01:00Hi all.
I just managed to find 10 2N5457s and test...Hi all.<br />I just managed to find 10 2N5457s and tested them. I got 5 between 3.14 and 3.17. is that close enough for matching them as a set?elbeeukhttps://www.blogger.com/profile/07120739147011219424noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-49710799821940868562014-03-06T22:30:32.760+00:002014-03-06T22:30:32.760+00:00is this also good as a tester? on what i have to s...is this also good as a tester? on what i have to set my dmm, an what does it show, if the transistor is right oder defekt.brembohttps://www.blogger.com/profile/07527310006085307074noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-65093091136314309472013-04-17T13:01:13.375+01:002013-04-17T13:01:13.375+01:00I built this and it works great. One question tho...I built this and it works great. One question though. I don't have a power switch on mine, so when I insert and remove the JFETs, the power is always on. Is this bad for the transistors, to do that when the power is live? Should I add a little switch to kill the power for the insertion/removal process? Thanks!RADhttps://www.blogger.com/profile/13612570094600090647noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-22896923809204732162012-10-31T11:54:41.370+00:002012-10-31T11:54:41.370+00:00It works, thanks a lot for help guys!It works, thanks a lot for help guys!Rethfinghttps://www.blogger.com/profile/11083630647857089554noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-29688736900311655282012-10-30T18:46:34.745+00:002012-10-30T18:46:34.745+00:00I have enough of soldering for a year :D I have th...I have enough of soldering for a year :D I have the JFET Matcher built so I just gonna put right opamp in the socket tomorrow and match the fets :)Rethfinghttps://www.blogger.com/profile/11083630647857089554noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-2371155990704757312012-10-30T17:57:25.530+00:002012-10-30T17:57:25.530+00:00Or you could always build the improved JFET matche...Or you could always build the improved JFET matcher:<br /><br />http://tagboardeffects.blogspot.co.uk/2012/07/greatly-improved-jfet-matcher.html<br /><br />which doesn't use any opamps.IvIarkhttps://www.blogger.com/profile/08416945174853142251noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-20479164995186797392012-10-30T17:04:13.932+00:002012-10-30T17:04:13.932+00:00Nooooooo waaaaaaay, I spend like 6 hours today wor...Nooooooo waaaaaaay, I spend like 6 hours today working on this matcher... Thanks for your reply, gonna check it tomorrow when I get my hands on some single channel opamps :)Rethfinghttps://www.blogger.com/profile/11083630647857089554noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-89176550149088307702012-10-30T16:38:37.880+00:002012-10-30T16:38:37.880+00:00Tl072 is a dual opamp, you need a single opamp. As...Tl072 is a dual opamp, you need a single opamp. As a general guide single opamps usually end with a 1 (tl071 etc) dual opamps end 2 (tl072 etc) and quad opamps end 4 (tl074 etch)dexxyyhttps://www.blogger.com/profile/15083992477248920480noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-11957341361799970432012-10-30T16:06:50.174+00:002012-10-30T16:06:50.174+00:00it doesnt work with TL072 either.it doesnt work with TL072 either.Rethfinghttps://www.blogger.com/profile/11083630647857089554noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-45165377183163569612012-10-30T16:06:34.291+00:002012-10-30T16:06:34.291+00:00it doesnt work with TL072 either.it doesnt work with TL072 either.Rethfinghttps://www.blogger.com/profile/11083630647857089554noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-90390693488216480962012-10-30T15:51:32.326+00:002012-10-30T15:51:32.326+00:00I don't think you can use a JRC386 for this......I don't think you can use a JRC386 for this... that's an audio amp. You want a single channel op amp like a TL071. Rosshttps://www.blogger.com/profile/00308536001054545039noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-11267032932003029632012-10-30T13:46:34.623+00:002012-10-30T13:46:34.623+00:00Still nothing. 0.02V on DMM...Still nothing. 0.02V on DMM...Rethfinghttps://www.blogger.com/profile/11083630647857089554noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-68671145797225587932012-10-30T13:30:58.829+00:002012-10-30T13:30:58.829+00:00OK hold on, I just spotted that I soldered capacit...OK hold on, I just spotted that I soldered capacitor in wrong direction. Clever, eh?Rethfinghttps://www.blogger.com/profile/11083630647857089554noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-3571581857094282852012-10-30T13:10:24.456+00:002012-10-30T13:10:24.456+00:00I've inserted JRC 386 and it shows around 5.25...I've inserted JRC 386 and it shows around 5.25V when there is no transistor, but when I plug 2N5952 it shows on all off them the voltage of 4.10V, while the max for them is 3.5V.Rethfinghttps://www.blogger.com/profile/11083630647857089554noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-10726856633708438702012-10-30T12:49:26.580+00:002012-10-30T12:49:26.580+00:004.5V voltage on resistors is shown when my 2N5952 ...4.5V voltage on resistors is shown when my 2N5952 is in, without it there's 4.5V on only one resistor. Can you help me?Rethfinghttps://www.blogger.com/profile/11083630647857089554noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-87306133845005912602012-10-30T12:34:14.653+00:002012-10-30T12:34:14.653+00:00It also shows 4.5V on every resistor and 9V betwee...It also shows 4.5V on every resistor and 9V between 4 and 7 pin of TL072.Rethfinghttps://www.blogger.com/profile/11083630647857089554noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-69123430385895441422012-10-30T12:32:32.393+00:002012-10-30T12:32:32.393+00:00Its set OK, it shows 9V on battery or power supply...Its set OK, it shows 9V on battery or power supply.Rethfinghttps://www.blogger.com/profile/11083630647857089554noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-81307442211891881472012-10-30T12:32:16.249+00:002012-10-30T12:32:16.249+00:00This comment has been removed by the author.Rethfinghttps://www.blogger.com/profile/11083630647857089554noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-84058934367215659752012-10-30T12:30:14.083+00:002012-10-30T12:30:14.083+00:00What do you have your DMM set to?What do you have your DMM set to?IvIarkhttps://www.blogger.com/profile/08416945174853142251noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-45799639267904707922012-10-30T12:27:20.291+00:002012-10-30T12:27:20.291+00:00I cant get it to work, my DMM shows voltage of 0.0...I cant get it to work, my DMM shows voltage of 0.02 or smth... im so resigned, I already tried 2 jfet matchers and cant any of them to work...Rethfinghttps://www.blogger.com/profile/11083630647857089554noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-62139241384177923832012-10-29T12:46:50.307+00:002012-10-29T12:46:50.307+00:00Yes, that's perfboard not stripboard. All the...Yes, that's perfboard not stripboard. All these layouts are based on stripboard because I think it's simpler to break the tracks than create them. Having said that, some things work very well with perf because you can take advantage of vertical as well as horizontal lines if you're creating your own tracks. But I stick to stripboard just to keep a common form.IvIarkhttps://www.blogger.com/profile/08416945174853142251noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-22394846411404348582012-10-29T11:56:41.301+00:002012-10-29T11:56:41.301+00:00So they're just breaks in connections. I have ...So they're just breaks in connections. I have a board when every hole is separated, so I dont need to drill and cut anything, but I need to solder all those horizontal connections + jumpers of course etc.Rethfinghttps://www.blogger.com/profile/11083630647857089554noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-88548038933135352952012-10-29T08:49:53.892+00:002012-10-29T08:49:53.892+00:00Track cuts. This may be useful for you:
http://ta...Track cuts. This may be useful for you:<br />http://tagboardeffects.blogspot.com/2012/04/vero-build-guide.htmlIvIarkhttps://www.blogger.com/profile/08416945174853142251noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-15773976224375179292012-10-29T08:48:32.707+00:002012-10-29T08:48:32.707+00:00And what are those red squares with red dots insid...And what are those red squares with red dots inside them?Rethfinghttps://www.blogger.com/profile/11083630647857089554noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-39058067073054219042012-10-29T08:15:39.033+00:002012-10-29T08:15:39.033+00:00They're links, so only the top and bottom wher...They're links, so only the top and bottom where the blue dots are.IvIarkhttps://www.blogger.com/profile/08416945174853142251noreply@blogger.com