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, September 1, 2015

King Dubby Delay

Here's a cool delay designed by Nocentelli posted over on FSB. Here's what he had to say about it over there:

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.





Note: I've recently found out the capacitor going from Repeat 3 to Osc Sw2 is 22n.

26 comments:

  1. que valor es el del capacitor con signo de pregunta?!????

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    1. en ingles es mas fácil que te respondan! jejeje

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    2. gracias =) estoy entre armarlo o no armarlo. es confiable? funcionara?

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  2. hey men , what value is the component that is in the repeat 3 ? Thank you

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  3. Nocentelli didn't give a value for that capacitor. So your best bet is socket and experiment.

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  4. has someone done this effect??

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  5. Hallo Dtgehring, could you tell us please what did you use for the misterious cap? 22n? Some other value? Thank you!

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    1. See above. Socket and try out different values.

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    1. Nocentelli didn't specify in his schematic, but I would assume 1N4148s

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  7. Greetings!
    I built this today. It's pretty awesome. Unfortunately, the OSC slam switch doesn't do anything. I was trying to figure it out, but I can't seem to get it to work. Maybe I need a normally open momentary switch for that one?.

    Also, I would love to be able to use the dub function but have it be switchable on/off so this could be used as a straight delay as well. I know it's probably really simple but my brain is farting on this one! Anyone know how I can do it?

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    1. There's a new vero layout for this over at TagboardFX. Nocentelli posted this link:

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

      Thought I would share it here in case others are trying to add this switch scheme, and could use a visual aid.

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    2. I wanted to add an update. i pulled this out of the "semi-working circuits box" last night since I had insomnia. Anyway, here was what I figured out.

      I was able to accomplish all that I wanted, which was to have a regular bypass, with momentary Dub Switch and momentary OSC switch. I wired it exactly as nocentelli mentioned with the addition of a simple slam mod on the OSC switch. On the OSC momentary switch, I soldered two sockets (one on each pole). I put a 20k resistor on there for starters. Then I ran a wire from one pole of the momentary switch to lug 2 of the Repeats pot, and another wire from the other pole to lug 3 of the Repeats pot.

      It was a lot of trial and error, but I finally figured it out. Hopefully someone will find this info useful?

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  8. hi, where I can get schematic for this one?

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    1. Added a hyperlink above that will take you to the original thread on FSB.

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  9. Hi, what's a transistor with o g i pins?

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    1. That's the 5v regulator necessary for the PT2399s. It's the 78L05.

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  10. Is there any way to add a tap tempo control?

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    1. Not easily with 2 PT2399s. Maybe with some creative Arduino wizardry. But that's well beyond my knowledge level.

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  11. About the Transistors Q1 and Q2, what these values ? BC559S ?

    And the mysterious Capacitor ? 22nF ?

    What about D1 and D2? 1N4148S ?

    Has anyone recently built one of these ?

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    1. Use whatever PNP silicons you have. And yes to the rest of your questions.

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  12. This comment has been removed by the author.

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