Sunday, 11 September 2016

King Dubby Delay

Here's a really nice delay designed by Nocentelli.
You can find the original thread on FSB here.

This is his description of the circuit:
Here's a variation on the deep blue delay; two PT2399 chips and a current mirror delay pot give around 2200ms delay, although beyond 700ms gets pretty lo-fi. There are two points where a momentary SPST can be used: Either to briefly connect the input to the delay input on select phrases (dub mode), or to bypass the repeats feedback resistor for self-oscillation on demand.


27 comments:

  1. Nocentelli's demo for this is totally badass. I'd build it right now if I had any big stripboard pieces left.

    Great layout as usual, and really cool design from nocentelli.

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  2. Great layout! I may have to try building this again. As it's drawn, there will be no repeats unless you hold down the "dub" momentary switch, so it's probably worth adding a toggle switch to short the lugs when you don't want dub mode. I used a single momentary footswitch and a DPDT toggle to switch between dub mode or oscillation mode: There's a wiring diagram for this here -

    http://i80.photobucket.com/albums/j190/Leeroyfunk/dubby%20footswitch_zpsscycspeh.gif

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    Replies
    1. Thanks for the help and the project!
      I've updated the layout:
      Is that what you meant?
      You use 2 Momentary and one DPDT?

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    2. No, I just use one single momentary and one toggle that assigns it to either dub OR oscillation (see the picture I've linked to). I couldn't envisage wanting to use both at one, or being able to hold down two foot switches simultaneously without toppling over. I would advise that if someone wanted two momentary footswitches with one for each effect, they'd just need a SPST toggle to short the lugs of the dub footswitch for constant repeats.

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    3. Ok, thanks.
      It should be correct now.

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    4. That looks right: I'm just a bit puzzled by "Switch 3 - 2&4-> Dub Sw1"

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    5. That was a left over from previous layout.
      I've removed it.

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    6. Hey, I'm still having trouble understanding this wiring for one momentary with a DPDT to choose between Dub or Oscillation. I see the photobucket link, but maybe the naming scheme is what's confusing me. On the drawing, it has Dub1, Dub2, and Osc2 coming off of the DPDT, where do they connect to if in the picture of the layout the DPDT is the Dub switch?

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  4. I built this one on an etched PCB:
    http://effectslayouts.blogspot.com/2015/09/king-dubby-delay.html

    Works mostly... Now that I see this layout posted, I'll have to poke around some more and see if I can get it fully working. Thanks for this layout!

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    1. And thanks nocentelli for linking us to that photo.

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  5. This concept of dub/ osc, if being applied to the Sagan Delay would result in the DDD! Definitive Dub Device. We need a brave one that makes the scheme for that. After that, add the Dub Siren to this monster, and you ll have big party!-)

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    1. Do you mean a schematic or a layout?
      There is a verified one here:
      http://tagboardeffects.blogspot.fr/2015/10/sagan-delay.html

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  6. yes! I noticed that, a great job by the way, I was joking about the fact that mixing these 3 blocks would be awesome for a reggae sound, I bought the pcb for the Sagan Delay, I am a coward, I know, facing big veros I find it a little dangerous for me. The fact is that I remember asking Chris (SaganDelay creator) about the chance to add the nocentelli momentary dub oscillation to the Sagan and he told me a way, but finally I didnt mod this, but seeing the king dubby again, really would be a great addition. I have to try and then I' tell you about. When Ill have it done, Ill comment in the forum or at at the Sagan Delay itself. In fact it was really simple, We add a DPDT for selecting SlAM pads with 2 of the outer lugs, and with the other 2 outer lugs, R24, the 10k that comes from 1uf must be cut and one outer lug from DPDT goes there and the other lug to the point where it would join 5k1, 10k , 10k and 4n7. Middle 2 lugs of the DPDT would be used for the momentary. That was the explanation, I hope this to be of some use. Thanks for the amazing layouts!

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  7. Replies
    1. Hi Svein!
      Have you tried to build it?

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    2. No not yet. I was wondering if someone else has build it yet. I'm looking for a next project, but last time I didn't have much luck with an unverified layout

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  8. I'm still having trouble getting this one to work. I think I may be confused with some of the switch wiring.

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    1. There is a regular 3PDT Bypass footswitch.
      A "DUB On-DUB Off" DPDT toggle switch (On/On) with lugs numbered the usual way:
      1 4
      2 5
      3 6
      The last switch (Oscillation) is a momentary SPST footswitch with lugs numbered
      1
      2

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    2. I've got all of that so far, but is this describing nocentelli's design where it's not actually a DUB On-DUB Off toggle, but a DUB-OSC toggle?

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  9. I would like to accomplish a few things with my build of this awesome pedal:

    1) limit the maximum delay time to around 700ms (like a real tape echo)
    2) increase the linearity of the delay time control

    If anybody could walk me through how best to do that, I'd be much obliged!

    Also, where exactly on the layout is the high- and low-pass filtering done to the delay repeats so I can possibly tweak those values as well? Hard to tell just looking at the vero without a schematic.

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  10. Just finished building, sounds amazing!!

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