Monday, 13 June 2016

Catalinbread SFT II

Here is V.2 of Catalinbread SFT Overdrive.
You can find schematic and extra info on the original FSB's thread here.
09/08/16 Layout updated! Changed Sw6 to Sw4.


72 comments:

  1. Noticed a difference between the 2 sides.
    line 4 to the right, the cut moves one place in the clean cut/link vero.

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  3. Thanks, I always wanted to try that one out!

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  4. Is there a link to the schematic? It works on one switch setting with the other being feedback and oscillation. It is also incredibly dark at all tone settings.

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    1. http://freestompboxes.org/viewtopic.php?f=7&p=259181#p259181

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  5. oh boy, now this is exciting!

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  7. Which would be the best substitutes for the MPF4393s?

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    1. Should test other JFets (2n5457, J201,..)

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  8. I'd love to add a separate 3pdt and pot to act as a boost side to this, is there a small one knob vol boost circuit I can add in separately as per the off board wiring section?

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    1. The AMZ Mini Booster is a great sounding booster, and really simple.

      http://tagboardeffects.blogspot.hu/2013/01/amz-mini-booster.html

      I think the Fulltone Fat Boost was copied and modded from this circuit.

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    2. If the circuit has plenty of volume you could just add a switchable volume pot on a DPDT on-on switch (or 3PDT for a Boost LED)

      Board Vol 3 to Sw2
      Boost pot 3 to Sw1
      Boost pot 2 to Sw4
      Vol pot 3 to Sw3
      Vol pot 2 to Sw6
      Output from Sw5

      This way you can have 2 preset volumes and the tonality shouldn't change....and no extra circuit to add.

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    3. thanks so much for that, where would the LED for the boost side go to? I have a few builds id like to add a volume boost to so will look at the AMZ as well

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  10. also looking again at the offboard section there is a diagram for a switchable boost, the "boost in" and "boost out" wires at the top, would they go to the volume pot?

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    1. Think of it as two completely separate circuits in series with each other. No different than turning on 2 pedals on your board. The off board switchable "boost" circuit could be anything...phaser/chorus/compressor etc.

      But in your case you want a volume boost. This diagram would put a boost circuit BEFORE your SFT...so it would increase the distortion, not the volume. You would want to put a boost circuit AFTER the SFT for that. So have a look at the Dual Effect example. Spend some time examining both and you'll see they are exactly same, only that the primary circuit (SFT in your case) is either first in series or last.

      Boost In/Out refers to the boost circuits In/Out as shown on its layout.

      For the two volume pots solution...follow my previous post and add an LED to the 3rd pole just like you can see on the off board page.

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  11. I've made the 1st SFT a while back and i love it for both guitar and bass.
    IMHO it responds great with a booster in front of it to crank it up like an amp. Like Ciaran mentioned, it mainly increases the distortion.
    FYI, I use a Super Hard On booster.

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  13. verified. with an assortment of fets (j201, j111, 2n5458)
    sounds great.

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    1. Hi Daniel, does it need any changes or is it just fine as it is?

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    2. I changed only a few values for something close, but everything seems in place.
      some Jfets in Q1 didn't work so well, so it took some playing around.

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    3. Thank you, I think I will give it a try after my mpf4393's will arrive.

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    4. Thank Daniel!
      Is the switch working properly?

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    5. With J201 in Q1 It worked fine.
      with different Jfet i had some oscilations.

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    6. The DIY Smart Saw pdf

      Today I was telling myself to stop building overdrives, fuzz... (I'm still waiting for partes to build 2 more). Now I realize I need one more :)
      Forex Enigma Review

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  14. If I wanted to make the Bass control steeper, I'd need to up the pot value right?

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  15. How does this compare to the Formula 5? Anyone built both? I was not very impressed by the Formula 5 with 2n5457, eventhough the demos sounded great.
    These demo's sound great too, but i'm scared it will resemble the formula 5 (which for me meant a compressed overdrive with not a nice grainy texture if that makes sense)

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    1. the catalinbread OD pedals are supposed to be based on different amps. with that in mind the formula 5 is a completely different animal since it's based on a different amp. the formula 5 is supposed to be based on an old fender amp, where the sft is supposed to be based on the ampeg svt.

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  16. Today I was telling myself to stop building overdrives, fuzz... (I'm still waiting for partes to build 2 more). Now I realize I need one more :)

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    1. Hahaha welcome to my world, mate! I thought I wont build nothing anymore but today I oredered parts for 3 overdrives and a fuzz... I dont know how could anyone stop this thing.

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  17. HI all, built this and sounds brill, I have noticed a couple of issues with other builds this one doesn't seem to have, I build a skreddy mayo and p19 amongst others. Some of my pedals have an audible pop when engaged, is there a way to get rid of this? thanks in advance

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    1. I had a the same problem with one of my builds.
      Read this, it helped me a lot.
      http://www.muzique.com/lab/pop.htm
      For me was the LED...I managed to get rid of it using a combination of AMZ true bypass mode (http://www.muzique.com/schem/dpdt.gif) and a small board to delay the LED turn-on (http://www.muzique.com/lab/led.htm). In my case I used the 3º schem.
      Hope this helps.

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    2. awesome thanks man, I'm having one of those days, desperately trying to get my P19 to work but its really quiet, the effect is there but vol is all the way up and sustain all the way up just to be near bypass vol

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  18. Is there a link to the schematic? It works on one switch setting with the other being feedback and oscillation. It is also incredibly dark at all tone settings.

    http://coradar.org/

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  19. I've same problems apparently, I A/B the clone and the original:

    - The pedal is really low/dark tuned compared to the original, I think there is a problem on the bass pot, like you can't shut up the bass frequenciens (on the original, on bass at 0, you only get treble)

    - There is a switching mode problem, on "stoner mode" in the clone, I get the same the same amount of gain than the "stones mode" on the original, and on the stones, I've clearly less gain.

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    1. Just realized the switch numbering on the schematic was wrong.
      I've corrected it.

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    2. Me too, now it works better, just the sound it's a little bit different, like 90%, from the original, more low mid thant high mid. Certainly there is a little mistake on it.

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    3. There could be a value or connection mistake somewhere in the schematic.

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  21. I made some progress :) Now the LED works, bypass mode also works like a charm... However, as soon as i switch the Pedal on, it turns silent... I used J111 as JFETs, could they be the wrong ones?
    My resistance between In & Out varies between around 450kOhm and 750kOhm, depending on the Volume Pot... Is that correct?

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  22. There is a revision, the 33K resistor is a 2.2K, it will increase the sound. I will try it tomorrow and tell you.

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    1. Ok.
      Cool.
      Let me know if it improves it!

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    2. 2K2 is the way!! Now it sounds really like the original :)

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    3. Thanks David!
      Layout updated.

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  24. Hi,
    I've built many pedals but this is the first time I can't find why my build is not working. The first second I plug the 9V, the pedal works well but really fast the output is stuttering and volume is lower and lower. In 6-8s there's no output at all. I have to unplug and replug the pedal to hear something again. I tripled-checked the layout, the tracks. I used PN4393 instead of MPF4393. Do you have an idea ?

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    1. This is strange. Mine build had exactly the same behaviour. When I plugged it to my testbox the circuit came alive. But after playing a while the sound began stuttering like there was a lose connention on the guitar jack/ cable. But it wasn`t and from then on the volume output got lower and lower. Now with volume and gain maxed the output is below unity (and sounds a kind of shitty). I used MPF4393 and built everything as per layout.

      This is strange because I can´t imagine that we both made the same mistake at the same time. Does anybody have an idea where to start debugging?

      Any thougts would be appreciated. Thanks.

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    2. Clearly looks the switch wiring, the pins are not correct based on "standard switch pin location", look the original schematic to understand how to wire it.
      I get lot of issues with this thing, now I made 2 of this babes and sounds really great.

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    3. I had to check the original layout to understand how to wire the DPDT but I'm sure I'm good on this side.

      I have solved the stuttering issue, I had a really tiny almost invisible connection between 2 tracks.

      Now I only have a problem with the gain which is continuously lower and lower. In 8 second I have no distortion even if the gain is at max. If I made a connection between the 9V and ground, the gain come back to full but starts again to lower. It looks like I have to reset the pedal :)

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  26. Hello all. I have built this and find i have way too much gain when compared to the first SFT in either mode. Is there a problem with the switch or is there a way to mod it for less gain?
    Thanks.

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  27. Switch wiring, switch wiring looks the original schematic.

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  28. Change Sw6 to Sw4.
    I'll change it on the layout.

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    1. It´s a bit noisy and one switch setting has really much gain, but yep, it´s working now. Thanks for that.

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  29. Hi, someone measured the voltage of the transistors? I built this , but it sounded as if not there is enough power in transistors. I used J113 for the JFETs. Thanks.

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  30. Hello all. Been a lurker here for a year & a half now. First time I've had to ask a question I wasn't able to find an answer for somewhere on this wonderful site!

    The DPDT: The schematic shows an "ON-OFF" designation. Is there such an animal? I've seen the 3 varieties at Smallbear & Mammoth. The ON-OFF-ON, ON-ON, or the ON-ON-ON variety. Is there an ON-OFF DPDT type switch and is that what is required for this build?

    I've seen and used an ON-OFF SPDT type switch but not that type of DPDT. That's why I'm a bit confused and want to make sure I use the right type. The schematic hasn't really helped me figure it out this time.

    As always, great site and thank you Alex, Mark, Miro, and all the others. You have taught me much over the last year.

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    1. You are more than welcome.
      You need an "On-On" DPDT switch.

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  31. How are you guys numbering the switch? Like this..

    1 6
    2 5
    3 4

    Or..

    1 4
    2 5
    3 6

    I've got some trouble with my build. Checked for bridges and checked the cuts with a DMM. Double checked component placement and values. Checked wiring. It has to be either bad components, or I've wired the switch wrong? I got some MPF4393's to use with this circuit.. they could be bad I guess?

    Can somebody with a working example post voltages please?

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  33. Same issues as a few above. Double checked all component values tracks, cuts, links, wiring, etc. Tried various combos of J201, 5457s, 5485s with widely varying results. All controls working properly, just really sound and oscillation with some FETs and settings. Someone please post voltages.

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  34. Haven't seen any voltages from a working version so here's what I'm getting with mine:

    Q1 .58-1.08
    Q2 9.4
    Q3 2.5-3.5
    Q4 9.4
    Q5 5.16-5.45
    Q6 9.4

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    1. Found an incorrect resistor biasing Q1 and corrected. Working now but had to correct the switch wiring again. It appears as though the last layout revision swapping the 33K to 2K2 the switch wiring was inadvertently mixed up. Should be Sw2 and Sw4 on the left side and Sw5 and Sw3 on the right, top to bottom. Voltages now read:

      Q1 4.8
      Q2 9.4
      Q3 4.1
      Q4 9.4
      Q5 5.2
      Q6 9.4

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    2. Hi, with the 2k2 mod it's almost similar to the original, but it's not 100%, in my opinion it's not perfect yet...(maybe i hear this because i tried it only with bass) I tried to wire the switch as you suggested but it oscillated in the 1st position and i had a high pitched feedback kinda sound at the "stoner" setting so i changed the 2 wires back. (I dont know how does it compare to the 1st version, i built that from Sabro's layout and they sound like 2 different animals). If the stones position supposed to sound similar to the 1st version, then they are completely different. This 2nd version has too much gain (compared to the 1st one) in my opinion. I will try to post some drain voltages tomorrow .

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    3. The layout switch wiring matches the schematic.

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    4. Yes, it matches, but O.K., here are my voltages (my supply gives 8,9V):

      Q1: 3,6
      Q2: 8,9
      Q3: 3
      Q4: 8,9
      Q5: 4,6
      Q6: 8,9

      I was searching for some demo videos and I came to that conclusion that this pedal sounds like as it should, with the much gain. It completely sounds like in this video:
      https://www.youtube.com/watch?v=FQMhiv7CigE

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  35. Hi,
    My switch is:
    1-4
    2-5
    3-6

    1 - wire sw4
    2,5 - wire sw3
    3 - wire sw2
    4 - empty
    6 - wire sw5
    I think it`s the best sounds results.

    Voltage:
    G - S - D
    q1: 6,4 - 8,43 - 5,8
    q2: 0 - 4,17 - 4,22
    q3: 4,66 - 8,71 - 7,20
    q4: 0 - 4,23 - 2,98
    q5: 4,28 - 8,85 - 7,90
    q6: 0 - 4,24 - 3

    I used 2n5457, and q2-J201

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