Monday, 25 April 2016

Madbean Sharkfin (Maestro FSH-1 Filter, Sample & Hold)

Here is Brian's modified version of the old Maestro FSH-1.
You could buy his PCB here and find all infos about this project here.


34 comments:

  1. Holy crap Aex, that layout looks amazing. I've built this on one of Madbean's PCBs, and that only just fits in a BB box, so to get your layout as compact as this is just stunning.

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  2. Going to have to give this one a go at the weekend. Built Madbeans version but never managed to get it working. Never understood why but the 13700 was just not getting any power. I eventually gave up and put it down to either a dodgy PCB board or a mistake i just couldn't see. Probably the latter.
    If anybody else attempts this just be aware lots of people have had problems with the PCB version, so take it slowly if you do.
    Let you know how it goes soon.

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  3. I was planning on buying Madbean's PCB for this, but this layout looks so good I think I'll just build this. My only concern is clock noise since this one tends to always have a little tick. I'm hoping it's not too bad on the stripboard

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  4. I built the Madbean PCB version a while back, and the LFO does, indeed, tick. It's not really noticeable when you're playing, though - just in the silences. Solution: never stop playing.

    Frank Zappa's Ship Ahoy is a good example of the S/H setting in action: https://www.youtube.com/watch?v=SFTJ8V2T0nM

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    1. Mine ticks too, but it's not a major issue. There's a warning on the build docs from Madbean about this, and they say you can't eliminate it. I used shielded wire on mine which is supposed to help.
      Like the Vox repeat Percussion, I think it's part of the character of the pedal which actually adds something, rather than just being a bad thing.

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    2. I read about the ever-present tick. I'm fine with it but also hoping it's not much louder on the stripboard compared to PCB. You know how these LFO driven builds can be sometimes..

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  5. Fun little effect.. not really something I'd ever keep on a touring pedal board or anything. Kinda hard to get going properly somehow. The Madbean PCB wasn't just one you could throw together.

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  6. Alex, Attack 1&2 should connect directly to F/SH Sw 3

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    1. Thanks Michael!
      I've fixed that.
      If you've already built that version, just disconnect the link between Decay 1,2 and F/SH Sw3 and connect F/SH Sw3 to Attack 1,2.

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  7. How to read footswitch 3pdt pin numbers?

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  8. Built this but think i may have my 3PDT toggle wired up wrongly. Should it be the same as the footswitch Travis posted above when the solder lugs are horizontal? Seem to have brain freeze today.

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  9. It is like Travis wrote.
    You can use a toggle or a footswitch.

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  10. Cheeras Alex. I did wire it up wrong then. Been one of those days, must have woke up on the wrong side this morning. Think i'll leave the correction until tomorrow. Let you know if i get it working.

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  11. You can tag it! Worked at first try! Sounds, erm, crazy!

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  12. Thanks Guilherme!
    Does it tick?
    If so, is it loud?

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    1. 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.

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    2. Maybe another IC instead of LM741 (the bottom right corner one)?
      TL061?

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    3. 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 scratch

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  13. 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.

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    1. Gavin, it's a pretty big circuit, but keep the faith, it works (the circuit, not the faith)!

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  14. 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.
    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.

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  15. Ok, got mine up and running. Had not cut a trace properly. Love this effect. Definitely one for boxing. Thanks as always guys/girls.

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    1. 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?

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    2. Hi Gavin!
      If you want I can eliminate the Sample & Hold part of the circuit and draw another layout for it.
      That's not too difficult.

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    3. http://guitar-fx-layouts.42897.x6.nabble.com/Madbean-Sharkfin-Filter-without-Sample-Hold-tp30635.html

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    4. Sorry Michael!
      I've missed that.

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  16. Few notes...

    Ticks like a ticky thing ticking! Even when bypassed before a high gain pedal. Going to try our usual tricks and see what happens.

    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.

    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.

    Don't use multi turn trimmers....it'll break your heart!

    All in, a great sounding effect. Cheers lads

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  17. 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.

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    1. You got it. Using a DPDT on/on...
      12K between 1 and 4
      Filter 2 to lug 2
      Hole next to top of 22K to lug 5

      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.

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