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.



12 comments:

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

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    1. Awesome! Quick work as always, Peter!

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    2. Hey Peter how does it sound with a TL072?

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  3. Verified!!! but low volume any suggestion?

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  4. This comment has been removed by the author.

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    1. This comment has been removed by the author.

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

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  6. 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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