This is a library of perfboard and single-sided PCB effect layouts for guitar and bass. I'm not an electrical engineer by any stretch of the imagination, just a DIY'er who likes drawing layouts. It is meant for the hobbyist (so commercial use of any of these layout is not allowed without permission) and as a way to give back to the online DIY community.

Monday, June 20, 2016

Catalinbread SFT

Here's a really versatile overdrive from Catalinbread. The SFT is based on Ampeg amps from the 70s, using JFETs to simulate tubes (like many of Catalinbread's other overdrives). The Stones/Stoner switch allows you to go from verge of breakup tones to near fuzz tones with the flip of a switch. This can be run off 18 volts and this gives extra headroom, so it may not be a bad idea to include a charge pump in your build. This layout reflects the newest version of the SFT, and the schematic can be found here.


13 comments:

  1. 18v really brings this one alive

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  2. Hello,

    Please make PCB for Catalinbread DLS MKIII

    reg
    Martin

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  3. The 33k resistor should be 2k2

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  4. Verified! I went with J201 for the trannies, a single 2n4393 costs like four pounds here. Also tried with 2n5458 but those made the breakup nasty and sputtery and a bit gated. Now it is really gainy, wonder how it sounds with a set of 2n5457. I wired the switch as the tagboardfx-layout suggests: lug 2 & 3 goes to bottom, and lug 5 & 6 to the top holes.
    Thanks for the layout!

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    1. I got my 2n4393s on Aliexpress for less. Didnt use them in my build yet, so i dont know how they compare to j201.

      The tagboardfx uses a differend numbering for the switch imho.

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  5. Cool, thanks! Is there any tranny/combination that you prefer?

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  6. Hello I had a problem with mine on the stones mode i have a really low gain and volume and when i switch to stoner everything seems like the video. I cheked every value and everything seems correct , the trannies i used are KS4393 which only have different layout from the stock ones. Is there a way i can boost the stones mode a little bit? Thanks in advance

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  7. Hello. If a want only use the stoner mode, should put some jumper in the place of swithches? Thanks

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    1. Just jump the Sw2-3 pads and leave the Sw4-5 pads open. You can also omit the 470k and 4.7n right by the Sw4-5 pads.

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    2. Nooby cuestión, but thankss

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  8. Do you think i can build it with the transistor replacement mpf4393 by mpf102?

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    Replies
    1. Compare the datasheets, but I think that should work. Worth socketing and experimenting with at least. J201 will work here and I would guess 2N5457s would too.

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