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.

Tuesday, July 17, 2018

Sentinel

The Sentinel is a PT2399-based pitch modulator, delay, reverb and drone verb designed by Arnoud Philip (~arph) as part of the DIYSB 10th Anniversary design contest. It's based on the Sewer Pipes ring-verb and the Noise Ensemble. Original thread here, schematic here. Should be able to squeeze it into a 1590B. 

Note: LED2 in the layout is a bi-color LED that could be used externally as a rate indicator or even the on/off indicator. For the later, use the footswitch to break/connect the connection between the common cathode (middle lead) and the 1k resistor going to ground at the top of the board. Also, the 25k trimmer is a fine tune control for the Drone pot.



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27 comments:

  1. UnknownJuly 17, 2018 at 3:52 PM

    Great, another effect to add to my (long) build list! And I just ordered parts yesterday, didn't got parts for this one... This sounds amazing!

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  2. PeteJuly 17, 2018 at 8:32 PM

    Verified! Had to use a TL072 as I had no 358's around. Very trippy pedal!

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  3. UnknownJuly 18, 2018 at 6:00 AM

    Can i use it bass ??

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  4. estivenAugust 6, 2018 at 1:50 PM

    Verified!!! but low volume any suggestion?

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  5. AnonymousAugust 7, 2018 at 4:44 PM

    This comment has been removed by the author.

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    1. AnonymousAugust 8, 2018 at 11:43 AM

      This comment has been removed by the author.

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  6. AnonymousAugust 8, 2018 at 11:55 AM

    Weird! I can only seem to get text in my comments if I use my phone, not my computer... at any rate!
    I built the perf version, it works great! Seems like it prefers L7805 regulator. I reversed the direction of the width control so that it gets wider as I turn it CW. As of right now, the bicolor LED isn't flashing the rate, but I'm sure I'll get that sorted. I'm adding a clean boost to mine, and boxing it up. Thanks so much for the layout.

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    1. UnknownAugust 28, 2018 at 4:41 PM

      You may have a bi-color LED with common anode - this one needs common cathode.

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  7. UnknownAugust 28, 2018 at 5:04 PM

    Cool! nice to see it here. I got some questions on the forum so let me address them here too.

    The drone volume is not too high no, should be around unity. The pedal can handle more on the input. Try a boost in front to get more clean sound.
    Also this is not a very trebly pedal by design, too much treble will make the drone sound become just a wash of noise.

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  8. AaeherApril 5, 2019 at 3:57 PM

    What transistor is that?

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    1. Effects LayoutsApril 5, 2019 at 8:43 PM

      It's a 5v regulator for the PT2399

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    2. AaeherApril 5, 2019 at 10:13 PM

      This comment has been removed by the author.

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    3. AaeherApril 5, 2019 at 10:42 PM

      Ohh,i'm going to test with the regulador 78l05, thank you :)

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  9. UnknownApril 25, 2019 at 3:59 AM

    hello there!
    just a newbie question.. how can i wire a 3PDT to bypass/activate the pedal?
    otherwise which footswitch do you suggest for the simple break between cathode and 1k resistor?
    thanks in advance

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  10. UnknownMarch 22, 2020 at 4:58 AM

    Hello. What sort of transistor should I be using for this? Thank you

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  11. LucasOctober 11, 2020 at 8:08 PM

    Perf version didnt work for me, its truly verified ? Not sound at all. Leds are always on, didnt rate.I used 78l05. Tried, TL072 and Lm1358n. Also tried 3 differents pt2399. Wiring, traces and components, checked. Not a single clue whats going on.

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    1. MXFXMarch 9, 2021 at 1:19 PM

      The perfboard version I built works as it should. Have you checked your build with an audio probe?

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  12. UnknownJuly 26, 2021 at 7:08 AM

    It works thanks to your website from Thailand.

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  13. UnknownOctober 22, 2021 at 1:51 AM

    How can I increase the output volume?

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  14. jpupoDecember 6, 2021 at 2:04 PM

    Etched Version didn't work for me:/ I built twice already:( Should the green led light up? only can get it to light when the pt2399 is upside down. Bi-colour led works rather well but just no sound at all... i know it's quite vague but any clues?

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    1. jpupoDecember 6, 2021 at 4:42 PM

      can't open schematic link as well and impossible to find a readable one online...

      Delete
  15. rreennddyyApril 11, 2022 at 10:48 AM

    hisssszzzzhhhhhh!!

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  16. rreennddyyApril 11, 2022 at 11:09 AM

    im fail

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  17. UzumeDecember 27, 2022 at 4:41 AM

    Sadly schematic is broken everywhere
    ... Any chance someone have it laying around its computer? Cheers!!

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  18. Nicholas BosMarch 11, 2024 at 12:16 AM

    Is the bicolor LED necessary for the rate indicator, or can I use a regular LED? If so, which side do I use? Thanks!

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