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, December 18, 2018

Dimension P Chorus

Had a request for this one and didn't feel like laying out another overdrive. So here you go. It's a chorus using a pair of PT2399 design to emulate the Boss Dimension C designed by Distorque. Original design thread here, schematic here for reference. I've laid it out for board mounted pots and will fit in a 125B with top mounted jacks.



28 comments:

  1. Thank you as soon as the results are ready,great Layout. :-)

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  2. Hello,
    I have a request for interesting fuzz - Parasit Studio Theremin Fuzz

    Here's build doc:
    https://www.parasitstudio.se/uploads/2/4/4/9/2449159/theremin_fuzz_doc.pdf

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  3. For what it's worth, I built the stripboard layout from Parasitstudio's website and got ticking & noise on two separate builds.

    There's a few suggestions from a user in Parasit's comment section. One suggestion was to provide each PT2399 with it's own LM7805 regulator.

    Once I gave each PT2399 it's own regulator, the ticks went away, and it was much quieter!

    Good luck!

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  4. Can you do the layout for this interesting chorus ?
    https://drive.google.com/drive/folders/0BwEUmCA5sw1bQ0doTG9RT3RfTFk
    Sounds amazing! it uses a pt2399, one ne5532 and 5 BC547
    I think is one of the deepest chorus just for one pt2399 Nice regards

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  5. This comment has been removed by the author.

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  6. Happy Hollydays! Could you, please, make a layout for that stereo mod? And maybe the double 7805's(one for each PT) I want to try to make this one.I wanted a ping pong delay and this might do the trick for me.

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  7. It's verified. I have added another 7805 according to the above comment.

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  8. I have a question. I don"t see at schem, that 5v from LM7805 go to 5 lug tl 072. Why is it go here?

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    Replies
    1. Schematic is linked above in the description. I'm guessing the designer used 5v instead of creating a separate 4.5v Vref.

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    2. Yes, i got it. Thanks. Doing!

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  9. verified too. I have added another 7805 too. It"s such chorus for kids.

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    Replies
    1. Hi, could you please teach me how to add another 7805? Where did you put it?

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  10. GOOD NIGHT. WHICH THE TOGGLE KEY USED IN MODIFICATION AND HOW TO CONNECT THE CIRCUIT TO THE SAME?
    THANKFUL.

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  11. It's working but I got a lot of high pitched noise. Tried swapping PT2399s to no effect. The only thing I noticed is a big signal drop of the 470k resistors. The high pitched noise is amplified along with the severely attenuated input signal, causing the whole high pitch issue. Any thoughts? Thank you!

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  12. I had a similar problem in another build and I found that I had a "ground loop" using both ground lugs on both (in and out) stereo female jacks. Also, there might be a short somewhere near the 2399, as I had that too. Check theese and take it from there.

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  13. Poderia fazer o Layout desse pedal aqui?! https://www.youtube.com/watch?v=iQ1y8gikPqQ e desse?!
    https://www.youtube.com/watch?v=N_vp2igXBmY&t=228s

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  14. And where the "voice" and "dry" selectors would be placed. Thanks for the help guys.

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  15. Excellent sound in the video, I would like to know where to place the connections for spdt

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  16. Shouldn't the 270R resistor of the second PT2399 be 100R?

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  17. This comment has been removed by the author.

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  18. It sounds great but it needs some mods.
    Even if
    i got my pts from china!

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  19. Its verified! Works great wt minor hassle but anyways its awesome! Jun fr Philippines

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  20. The schematic link isn’t working any longer. Do you still have the schematic?

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  21. Hi, I built this pedal and everything works, but I get a slight overdrive in the sound. I tried to reduce the input sound level to the chorus, but overdrive still happens. I also tried to replace the operating seat, and that didn't fix my choir either. Can you advise me where to look for the problem and how to fix it?

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  22. Hi,
    I just built the PCB version, slightly modified for two regulators as indicated by some. The circuit works, however I get a sort of periodic thump that follows the rate pot.

    I'm not sure if this is the "clicking" that some described... more of a low frequency thump, sort of like a heartbeat. Turning up the rate pot accelerates the "heartbeat".

    I'm testing this without an enclosure along with 3PDT switching, although I plan to enclose it.
    Has anyone else encountered this "thumping"?

    Any indication that this is noise-related and could go away with an enclosure?

    Any thoughts/ideas?

    I have a bunch of PT2399 I could try swapping...

    Thanks in advance!

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    Replies
    1. I've been tracing the PCB and comparing to the original schematic and I've noticed something.
      In the original Distorque schematics, the regulators input is taken straight from the 9V supply, whereas here, the regulator input is taken AFTER the 100R resistor.

      There may be something else wrong with my wiring, but the voltage for me after the 100R resistor is merely 5.35V, which is way below the 7V needed by the 7805... I'm only getting a bit more that 3V from the regulators... not good.

      Was the change in the regulator input intentional?
      Anyone who built this can confirm the voltage after the 100R resistor?
      Just trying to see what the problem might be here...

      Thanks in advance!

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    2. Sorry for spamming, just wanted to leave my solution here in case it helps anyone from the Googlenets...

      I removed the PT2399s and measured everything again, the regulators got enough voltage. Connecting just one PT2399 back in, already dropped the regulator voltage below normal values.

      So after much double-checking and triple-checking, I decided to scratch the regulator input PCB strip and connect it straight to the 9V supply... Volia!!! no thumps, no clicks, no noise, just clean chorus baby!

      @Effects Layouts, you might want to revisit the diagrams. I guess the current drawn from the PT2399s is large enough so that the voltage drop in the 100R resistor is significant. If you take the regulators input from this point, it's going to be around 5.3V, just not enough.

      Anyway, I can provide the modified PCB layout for two regulators (needs one more jumper) and the power hack (needs another big ass jumper :) ) if anyone is interested.

      Keep on rockin' !!!

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  23. Holy crap, that's my video! Been browsing the site, downloading and sorting all the layouts. Can't wait to try some of them. Keep up the amazing work!

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