tag:blogger.com,1999:blog-6847048658257278783.post5747903603718241554..comments2024-03-29T01:36:12.851+00:00Comments on Guitar FX Layouts: Madbean Sharkfin (Maestro FSH-1 Filter, Sample & Hold)IvIarkhttp://www.blogger.com/profile/08416945174853142251noreply@blogger.comBlogger45125tag:blogger.com,1999:blog-6847048658257278783.post-71067757585270307312023-11-17T21:20:38.848+00:002023-11-17T21:20:38.848+00:00When I was first testing this pedal I ignored the ...When I was first testing this pedal I ignored the LEDs, and when I finally put it all together I suddenly started hearing the ticking that everyone was talking about. Turns out a big contributor to the ticking is in fact something to do with the Speed LED and most likely some other things involving the LFO and the SH footswitch, but I haven't dug too far into it.<br /><br />I also added a wet/dry blend (the mini JFET blend layout by IvIark) on a daughterboard because I found the SH mode obscured the input signal a bit too much. Definitely ground the speed pot through the bypass switch as described by MAO, it's perfect for getting no ticking in bypass, but the blend makes the ticking even more obvious when engaged. <br /><br />If the ticking is bugging you when actually using the SH mode, just add a capacitor between the "Speed LED +" strip and ground, the simplest form of a low pass. I used a non-polarized 68nF and it got rid of the ticking without noticeably touching the actual audio signal (which it hopefully shouldn't in the first place). <br /><br />I think the reason it helps is because it is smoothing out the square wave from the LFO so when it affects the audio signal, however it is doing that, it is less noticeable. <br /><br />All in all, really awesome pedal. Tons of fun figuring it out and reading the comments here.VirtualMilkhttps://www.blogger.com/profile/03164311049075585969noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-30060588504038430082019-03-08T14:53:47.009+00:002019-03-08T14:53:47.009+00:00Thanks Mao! In the end I found an extra B2M and ju...Thanks Mao! In the end I found an extra B2M and just used that. I'm not sure if the difference is great, but at least I won't wonder anymore. There are so many variables with this circuit (noise transistor choice, opamps, offboard wiring, etc.) that I figured it best to not insert different component choices too. Paulhttps://www.blogger.com/profile/06579395192132276828noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-16715745965442219892019-03-08T02:00:34.151+00:002019-03-08T02:00:34.151+00:00The REZ control is wired like a rheostat, and it i...The REZ control is wired like a rheostat, and it injects between 0k to 2M resistance between the Q2 jfet and the negative input of the 13700. <br /><br />So if you use a 1M, you're literally cutting the REZ control in half. Instead of going from 0-10, you'll only have 0-5. <br /> <br />You can easily test whether or not you want or need the "missing" 2nd half of the REZ control. Just swap out the 100k resistor at REZ 1 pcb connection with a 1M. This would simulate the 2nd half of the REZ control's rotation. (5-10)<br /><br />If you don't like the "5 thru 10" settings with the 1M resister, then put the 100k back in and just use the 1M pot. <br /><br />If you ONLY like the settings with the 1M resister installed, then leave it like that with the 1M pot. (You could also use a resistor somewhere between 100k and 1M, like 470k and that would be like having just the settings "3 to 7" on the REZ control.) <br /><br />But, if you do like the control with both the 100k and the 1M resistor, then you will need to use a 2M pot. <br /><br /><br />BTW, you can make a 2M linear pot by getting a 1M dual linear (from Tayda) and wire the 2 wafers in series. Connect lug 1 to the pcb as usual, connect lugs 2 and 3 to lug 4, and connect lugs 5 and 6 to the pcb's lug 3 connection. It will function exactly like the 2M linear pot. MAOhttps://www.blogger.com/profile/16009444316767677263noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-81876516490722384602019-03-06T17:10:24.137+00:002019-03-06T17:10:24.137+00:00I've only got B1M pots on hand, but that seems...I've only got B1M pots on hand, but that seems to work fine for the resonance pot (I usually leave it wide open anyway). Would that really make enough of a difference to make it worth sourcing a B2M? <br />Paulhttps://www.blogger.com/profile/06579395192132276828noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-68569878175910888352018-10-01T03:43:13.632+01:002018-10-01T03:43:13.632+01:00If you are getting ticking when bypassing the samp...If you are getting ticking when bypassing the sample/hold side, try this countermeasure. <br /><br />Instead of connecting the usual ground wire to bypass stomp switch lugs 2,3 and 6, just attach the ground wire to lugs 2 and 6. Then run a wire from the speed pot lug 3 to the now vacant bypass stomp switch lug 3. <br /><br />The idea is to ground out the speed pot's lug 3 when the bypass switch is engaged. <br /><br />This eliminated 100% of the tick in my build when bypassing the Sample/Hold effect. (There wasn't any ticking when bypassing the Envelope side, only when bypassing the Sample/Hold)<br /><br /> MAOhttps://www.blogger.com/profile/16009444316767677263noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-65576678220846883902018-09-30T23:15:32.584+01:002018-09-30T23:15:32.584+01:00Great tip on R4 Piotr, thanks!Great tip on R4 Piotr, thanks!MAOhttps://www.blogger.com/profile/16009444316767677263noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-67229187594480950962018-09-30T21:59:04.185+01:002018-09-30T21:59:04.185+01:00I also tied the base to -9v and floated the collec...I also tied the base to -9v and floated the collector, and it's much easier to dial in. With more range than I remembered vs the original pcb. <br /><br />Thanks for the tip Ciaran and Rory!MAOhttps://www.blogger.com/profile/16009444316767677263noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-18197180106125010202018-07-31T22:06:53.926+01:002018-07-31T22:06:53.926+01:00I just wanted to add more support to the noise tra...I just wanted to add more support to the noise transistor being set up wrong in the official build. Float the collector, not the base.<br /><br />Here's a little article on the subject:<br />http://aquataur.hilpold.net/aquataur/musicstuff/fsh-1.htmlchili.doghttps://www.blogger.com/profile/07150178655877771270noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-25018293951123594742018-04-09T21:19:13.396+01:002018-04-09T21:19:13.396+01:00If I want one closer to the original (VCF-200/FSH-...If I want one closer to the original (VCF-200/FSH-1), could I just replace the potentiometers with fixed resistors? Is there anything else I should do?Bruno Vianahttps://www.blogger.com/profile/09622976996728052388noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-54566862041408310602017-11-08T20:16:47.411+00:002017-11-08T20:16:47.411+00:00Ok, done. Decreasing the value of r4 (100k to 56k)...Ok, done. Decreasing the value of r4 (100k to 56k) increases output and response. Now it shines even more!<br /><br />Piotr Kuzemczakhttps://www.blogger.com/profile/07414584324862844805noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-90119279602076572692017-11-05T17:25:53.333+00:002017-11-05T17:25:53.333+00:00Great filter, fired up straight away. Any ideas ho...Great filter, fired up straight away. Any ideas how to add volume knob to boost it slightly above the unity level?Piotr Kuzemczakhttps://www.blogger.com/profile/07414584324862844805noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-26323049554989565162016-09-29T19:20:15.792+01:002016-09-29T19:20:15.792+01:00You got it. Using a DPDT on/on...
12K between 1 a...You got it. Using a DPDT on/on...<br />12K between 1 and 4<br />Filter 2 to lug 2<br />Hole next to top of 22K to lug 5<br /><br />You could also use a SPST but you'd need to fly the 12K or squeeze it into the top left and make a cut next to the diode.<br />Ciaran Hasletthttps://www.blogger.com/profile/14841971807120256954noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-54189161212283558632016-09-29T18:53:00.720+01:002016-09-29T18:53:00.720+01:00Anybody know how to incorporate the up/down switch...Anybody know how to incorporate the up/down switch that GGG's design has for the sample/hold? Looks like just a 12k resistor in/out of the circuit, but I'm never sure with this kind of stuff. cjonesplayhttps://www.blogger.com/profile/18114332198960904730noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-33284135076231366482016-09-28T10:26:13.475+01:002016-09-28T10:26:13.475+01:00Few notes...
Ticks like a ticky thing ticking! E...Few notes...<br /><br />Ticks like a ticky thing ticking! Even when bypassed before a high gain pedal. Going to try our usual tricks and see what happens.<br /><br />The floating base has to be wrong. I've read thru every FSB post (Nocentelli's included) and can confirm that there must have been a schematic error thats been continuously copied from one version to the next. Tying the Base to -9V (the collector socket in this layout and float the collector) gave instant results! People here and on Madbean have constantly reported that tuning this thing was a nightmare....but with the collector now floating it's a breeze.<br /><br />The Top trimmer now seems to set the range of CV that will be triggered (i.e. how low and high the filter will open) and the right most sets where within that range it will open (kinda like a depth range). Instant results with every BJT I tried. The gain does have an effect but like I said, you can redial the operating range in quite easily.<br /><br />Don't use multi turn trimmers....it'll break your heart!<br /><br />All in, a great sounding effect. Cheers ladsCiaran Hasletthttps://www.blogger.com/profile/14841971807120256954noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-26645238639566880202016-05-26T11:13:05.096+01:002016-05-26T11:13:05.096+01:00Sorry Michael!
I've missed that.Sorry Michael!<br />I've missed that.Alexhttps://www.blogger.com/profile/02431893143306628176noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-84030323426788368262016-05-26T08:05:59.970+01:002016-05-26T08:05:59.970+01:00http://guitar-fx-layouts.42897.x6.nabble.com/Madbe...http://guitar-fx-layouts.42897.x6.nabble.com/Madbean-Sharkfin-Filter-without-Sample-Hold-tp30635.htmlMAOhttps://www.blogger.com/profile/16009444316767677263noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-45282776747719266552016-05-25T10:53:21.598+01:002016-05-25T10:53:21.598+01:00Hi Gavin!
If you want I can eliminate the Sample &...Hi Gavin!<br />If you want I can eliminate the Sample & Hold part of the circuit and draw another layout for it.<br />That's not too difficult.Alexhttps://www.blogger.com/profile/02431893143306628176noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-91988209762245392102016-05-24T20:40:19.349+01:002016-05-24T20:40:19.349+01:00Thinking i would like to wire the rez so i can use...Thinking i would like to wire the rez so i can use it with an expression pedal as the filter on this seems like it should work well with it. Maybe even seperate the filter and stick it in a wah pedal. Any thoughts?Hozy31https://www.blogger.com/profile/16714771534041521767noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-7648308987209934312016-05-07T15:26:45.085+01:002016-05-07T15:26:45.085+01:00Ok, got mine up and running. Had not cut a trace p...Ok, got mine up and running. Had not cut a trace properly. Love this effect. Definitely one for boxing. Thanks as always guys/girls.Hozy31https://www.blogger.com/profile/16714771534041521767noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-27843852257085021892016-05-03T17:32:27.288+01:002016-05-03T17:32:27.288+01:00This is an amazing Effect! I built the vero of the...This is an amazing Effect! I built the vero of the oberheim vcf published by Harald Sabro on sabrotone.com a while ago. I was reeeally lucky with it, as it worked right away, had no issues with ticking (only a tiny bit, I used Tl022s) etc. <br />Used 245As for JFETs and 2n2222 for that noise transistor. That one's a bit tricky, you have to try out different NPNs to see which one gives you the best sound. I might try a 5088 as well in the future, maybe thats even better. Anonymoushttps://www.blogger.com/profile/04941484080246094096noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-69076536480017446582016-05-02T22:24:23.561+01:002016-05-02T22:24:23.561+01:00Gavin, it's a pretty big circuit, but keep the...Gavin, it's a pretty big circuit, but keep the faith, it works (the circuit, not the faith)!Guilhermehttps://www.blogger.com/profile/06933426270421716475noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-17595475401011223562016-05-02T19:33:26.381+01:002016-05-02T19:33:26.381+01:00I'll try it! Probably I'll just use buffer...I'll try it! Probably I'll just use buffered bypass in this one, since I didn't used sockets, and build another one from scratchGuilhermehttps://www.blogger.com/profile/06933426270421716475noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-40918391759880605182016-05-02T19:20:59.928+01:002016-05-02T19:20:59.928+01:00Maybe another IC instead of LM741 (the bottom righ...Maybe another IC instead of LM741 (the bottom right corner one)?<br />TL061?Alexhttps://www.blogger.com/profile/02431893143306628176noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-9315273596121722522016-05-02T18:50:37.040+01:002016-05-02T18:50:37.040+01:00I'm having a problem with my build. Not sure w...I'm having a problem with my build. Not sure what the problem is. I get ticking in sample mode but thats it. I need to look over it again. I seem to be making silly mistakes recently.Hozy31https://www.blogger.com/profile/16714771534041521767noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-35677186168764717042016-05-02T17:52:43.708+01:002016-05-02T17:52:43.708+01:00It ticks only in the sample mode, and also, clicks...It ticks only in the sample mode, and also, clicks when in bypass, when in this mode (and I wire my 3pdts grounding the effect input when in bypass and all. Guilhermehttps://www.blogger.com/profile/06933426270421716475noreply@blogger.com