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.

Saturday, November 22, 2014

JFET Boost

Here's a quicky. It's an old Dragonfly design and was my first perf build.



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22 comments:

  1. fredSeptember 22, 2015 at 10:30 PM

    Hi, this is a clean booster?

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  2. UnknownSeptember 28, 2016 at 5:01 AM

    Yes clean booster ,very very perfect

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  3. SkaybluesDecember 21, 2016 at 8:35 AM


    I built this pedal with mpf102 and it sounds ugly, is it possible that the replacement you use is not the right one?
    The transfer image lacks a hole for a resistance of 2.2k?

    ReplyDelete
  4. DarkanumFebruary 6, 2017 at 3:13 PM

    What is a replacement for J201?

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    Replies
    1. IvMFebruary 7, 2017 at 11:56 AM

      Try 2N5457, or F245A. I used both, and works great.

      Delete
  5. ThaipedalstompboxJuly 15, 2017 at 11:55 PM

    https://www.youtube.com/edit?o=U&video_id=EITs60ZwEUI

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  6. UnknownOctober 11, 2017 at 11:08 AM

    Does this scheme work or do I need to change something in the leyout ?

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  7. UnknownJanuary 25, 2018 at 1:39 PM

    To whom it may concern you can use a j113 if you change the 22k from 9v to a 10k just make sure to check pinout on transistor.

    ReplyDelete
  8. ZeDJuly 3, 2018 at 9:33 AM

    So, if you use a, say, 50k trimmer in place of the 22k bias resistor, you should be able to use other jfets and bias accordingly, right?

    ReplyDelete
  9. Effects LayoutsJanuary 27, 2020 at 7:53 AM

    The pot is wired off board. The pads labeled "Boost 1" and "Boost 3" tell you which lugs to connect. Boost 2 is the circuit output, and the pot is a 100k audio/log taper. See the General Layout Notes tab for offboard wiring info.

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  10. JohnJanuary 31, 2020 at 5:31 AM

    For caps, use caps polar or non polar?

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  11. Effects LayoutsJanuary 31, 2020 at 12:13 PM

    Polarized

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  12. JohnJanuary 31, 2020 at 12:30 PM

    This comment has been removed by the author.

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  13. JohnFebruary 3, 2020 at 4:34 PM

    Still not work, i try with J201 and the same value of resistor an caps , but didnt work.

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  14. UnknownMay 18, 2020 at 3:13 AM

    Does anyone know if this would work off 12v.building it into preamp section of a micro amp project. If not I can add another stepdown

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    Replies
    1. Effects LayoutsMay 18, 2020 at 9:56 AM

      You might need to adjust the 22k resistor going from voltage to drain, but I would think it'd work fine on 12v

      Delete
  15. UnknownJuly 15, 2021 at 5:12 PM

    few questions:

    can i use this with a dynamic mic without distortion? or there's some kind of problem in impedance or smthing?

    can i replace this with a 2sk170bl? any ultra low noise replacement with the same pinouts as j201?

    ReplyDelete
  16. Ayah akmalMay 16, 2022 at 11:27 AM

    Permisi saya membuat ini dengan 2n5458 dengan potensio B100K suara terdengar kecil...
    Ada yang dapat membantu saya

    ReplyDelete
  17. EMedlinAugust 22, 2023 at 4:14 PM

    Just completed this. My first attempt at using non strip perf board. I think i like it better. I get more of a sense of what is actually happening this way. It worked by the way. Although it sounds bad at low volume. Crackly. Im sure its my soldering though.

    ReplyDelete

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