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, February 24, 2015

Mad Professor Deep Blue Delay

The Mad Professor Deep Blue Delay is regarded as one of the best PT2399 based delays out there (with the price tag to match that reputation). It's a warm and natural sounding circuit with an analog direct signal path (aka, no buffers), and plays nice with distortion boxes as well. I've labeled IC1 as a TL072 as it's what you most likely have in your parts drawer, but the originals have either OP275 or AD712 for what it's worth. Pots can be board-mounted from the solder side of the board using right angle PCB mount pots.




114 comments:

  1. Replies
    1. Awesome! Glad you were able to get it working.

      Delete
  2. hi, do it, works but it has a pop when activate the effect.any suggestions?

    ReplyDelete
    Replies
    1. Try increasing the value of the pulldown resistor at the input.

      Delete
    2. Thanks, i tried later whit 4m7.

      Delete
    3. If that doesn't work, you could try putting one off the output to ground as well.

      Delete
    4. i have no pop see my video on https://www.youtube.com/watch?v=e3-p6VLQf8A

      Delete
    5. To get rid of the switch pop, solder 100K resistor on the pcb between the output and GND.

      Delete
  3. Hi, mi build is really noisy, like a dirty potentiometer after delay at 10 o clock. Any clues? Is this normal? Thanks!

    ReplyDelete
    Replies
    1. Yeah, that shouldn't be normal. Have you tried replacing that pot?

      Delete
  4. Here is mine! :)
    https://www.dropbox.com/s/1u5u381tp7ld26m/Crytal_Ice.jpeg?dl=0
    Great sound!
    Thanks!

    ReplyDelete
  5. my build doesn't produce any delay and feedback, only clean sound. what do you think is happening?

    ReplyDelete
    Replies
    1. Sounds like signal isn't getting to the PT2399 or you have a bad PT2399. Signal goes from the input buffer through the 1µF cap to the delay section, so check that cap too.

      Delete
    2. I have changed my PT2399 twice, and all of them are new. 1µF cap next to 360K resistor right? I'll try to replace it. thanks man

      Delete
    3. Yep. Here's a good thread on debugging that circuit as well:

      http://www.diystompboxes.com/smfforum/index.php?topic=99301.0

      Delete
    4. still cannot be able to make mine works... damn...

      Delete
    5. This comment has been removed by the author.

      Delete
    6. have you tried to connect pin 3 and 4 of the PT to get pin 4 to the ground? that how my problem was solved. unless you got a bad PT or regulator..

      Delete
  6. Replies
    1. Hello, I have the same problem of clean sound without delay, please as you solved the problem?

      Thanks in advance and greetings

      Delete
    2. One question you had to modify something to the circuit for you to work. I wait your answer . regards

      Delete
  7. Hello! i have a question the transistor code?

    ReplyDelete
    Replies
    1. this regulator can be replaced by something like 2222

      Delete
    2. Pretty sure you have to use a 5v regulator and not a BJT transistor with the PT2399.

      Delete
  8. Working! Well done loyout! Ty mate :)

    ReplyDelete
  9. Hello! can you tell me the pcb size? for transfer, thank you!

    ReplyDelete
    Replies
    1. Check out the "Transfer Image Library" tab at the top of the page.

      Delete
  10. Dude I got a problem. Every time i turn on my power supply to the pedal, it doesnt work. It then only works when i take the pt2399 off of the sircuit and put it back or touch the connection which connects the 7805 transistor to the IC to give if some kind of electric shock while the power supply is on. I've built two of this and both the same. Seems like the problem in the power section. What do you think is happening to mine?

    ReplyDelete
    Replies
    1. You're locking up the PT. Try using a different one. They can be kinda spotty.

      Delete
    2. I've used 5 different PTs, still the same.

      Delete
    3. Hi, it happen to some of PTC chips (especialy in Indonesia). It needs direct join pin 3 of the PT2399 to pin 4 to ground. For this layout you can just connect pin 3 and pin 4,and its done ( at least for me).

      Delete
    4. asking permission to explain that in Bahasa.
      @Arief: bisa dijelaskan lebih rinci bro?

      Delete
    5. ah I see, I got it now.
      @Ariev Setiawan: makasih bro!

      Delete
    6. ok, it's now 100% working!
      thanks a lot

      Delete
  11. I just build this pedal and sounds awesome, but everytime I turn the effect ON or OFF it's makes loud POP, the thing is that it sounds no matter if the dc jack is plugged or not. Sorry for the bad english

    ReplyDelete
    Replies
    1. read comments above brother

      Delete
    2. Ok I did increase the pull down resistor on input and solder another one on the output but there's no decrease on the POP

      Delete
    3. si usas mlienium baja la resistencia, o bien cambia el footswitch a un 3pdt, varios pedales los he solucionado asi

      Delete
    4. have you tried soldering 100K resistor on the pcb between the output and GND, like Rafik Guergour said above?

      Delete
    5. Estaba poniendo mal resistencia como pull down.. DERP, conectando la resistencia entre la salida y tierra fue suficiente, muchas gracias.

      I was making wrong connections with pull down resistor... DERP, that was all it need. Thank you very much

      Delete

  12. Hello , sorry for the ignorance , I would like someone tells me that type capacitors are marked in yellow, 47 pf and 100 I mean , thank you very much in advance and greetings

    ReplyDelete
    Replies
    1. Those would be ceramics but other types can be used.

      Delete

  13. hello, thanks for the quick response , the confusion came because some are green and these two were coming by to ask in yellow, greetings

    ReplyDelete
  14. hello, thanks for this layout but can you give me a schematic diagram for this ? thanks again :)

    ReplyDelete
    Replies
    1. http://i752.photobucket.com/albums/xx167/illcom777/SeaUrchin_schembypassswitching.jpg

      Delete
  15. Hi! I find 2 mistakes. Pin 3 And 4 of the pt2999 must to go to GND. And the other mistake, a 100k resistor beetween OUT And GND. Fixing this, you are resolving the POP issue

    ReplyDelete
  16. I just finished this DBD. Sound great and yes there was big pop sound. However, after add 100k between OUTPUT and GROUND, the pop sound had gone!!

    ReplyDelete
  17. I had the same issue. I even tried using an optical bypass board (H11F1 board). I tried the 100k resistor between the output and ground, worked like a charm. Thanks for the tip!

    ReplyDelete
  18. I love your layouts. I had an idea and was wondering if you had ever thought of laying this out with fixed right angle pots? Just an idea but awesome layout. Thanks again.

    ReplyDelete
  19. Thanks man. This one actually is laid out for right angle PCB mount pots. You just need these:

    http://www.mammothelectronics.com/Alpha-Potentiometer-p/210-100-b.htm

    Or you can use pots with solder lugs and use solid core wire to make the legs.

    ReplyDelete
    Replies
    1. Hello MCFLY!!! Is anyone in there? I feel so stupid. I am sorry that I did not look at it closer. At any rate, You rock and so does this page. Thank you for all that you do.

      Delete
    2. Haha no worries, man. We're all guilt of the ol' brain fart now and then :D

      Delete
  20. I'm curious about tone control for the delay. Is it possible to add tone pot? Is it will be complicated?

    ReplyDelete
  21. the only mod I know for this pedal is only the volume pot

    ReplyDelete
  22. Hi all, hi _Effects Layouts_!
    This is really cool delay, thanks. But I have a problem with it. I built it about 2 months ago, and it worked great!
    Last two weeks the pedal just laid on the floor, I didn't used it. Yesterday I wanted to play with it, aaaand bummer - it is only clean signal. No delays at all.
    Any suggestions?
    Thanks.

    ReplyDelete
    Replies
    1. Could be something wrong with your PT2399. Try jumping pins 3 and 4

      Delete
    2. Already tried, no effect.
      If PT2399 is deads, may be you could suggest good manufacturer of these chips? I took it from Tayda.

      Delete
    3. from my experience, there must be something wrong with your cables (if you are using cables to connect the board to the pots). try to resolder them.
      this happens to me many times

      Delete
    4. I haven't had a problem with Tayda parts before. Sadly, the PT2399 can be pretty finicky. Fortunately they're pretty cheap. I'd just try popping a new one in there.

      Delete
    5. pots in my build are soldered into pcb, already checked.
      strange thing is that it worked whole month, even more, without any minor troubles. and then just fail, while lying on the floor.

      Delete
    6. Ok, thanks for the reply.
      Cheers!

      Delete
  23. Very cool delay man. Thanks!!!
    i didn´t bridge the pin 3 & 4 of the PT2399, weird yeah?
    thanks again

    ReplyDelete
  24. Hi, just curious. Does the repeats decay in non-linear manner? Mine only the first repeat is loud as the clean signal. 2nd's and above are so low. This only happen if I set the repeats in the region before 3 o'clock. On 3 and above, the repeats decay linearly.

    ReplyDelete
  25. Done beautifully!! Thanks for the layout!!

    ReplyDelete

  26. They hello to everyone, please be so kind to help me to run my delay, I made the pcb twice and only get clean signal, sometimes me that, just a strange noise like a whistle, other times to remove the battery and put it seems that would work but nothing.
    I tried 10 PT2399 and several transistors and capacitors, which can no longer be more, please appreciate that I can help them.
    Sorry for my English, I use google translator.
    if they can explain what the pin 3 and 4 PT2399 I appreciate it, I have tried unsuccessfully, I have bridged 3 and 4 and have grounded.

    Thanks in advance and greetings

    ReplyDelete
  27. how can i add a tails mod to this layout? thanks :)

    ReplyDelete
  28. Hi, admin, according to the schematics, pin 4 ic pt2399 should connect to ground. Please change your layout to make it more perfect.

    Btw thanx for this amazing site

    ReplyDelete
  29. Hey guys, someone can help me? What is the size of PCB?

    ReplyDelete
    Replies
    1. Check out the Transfer Image Library tab at the top of the page.

      Delete
    2. Thank you! Another question. How can I know the types of caps I have to use?

      Delete
  30. I made it! Here is a video, with a Dub Siren attached.
    https://youtu.be/ZNozovL8tbY
    My troubleshooting here http://www.diystompboxes.com/smfforum/index.php?topic=114025.0

    ReplyDelete
  31. Really Cool Pedal!!! It sounds nice and has clean and nice tone. The feedback is very useful and inspiring, and with some distortion and chorus is a great toy to play. Verified 100%.

    ReplyDelete
  32. Is possible to take the dry signal out in this one?

    ReplyDelete
    Replies
    1. Dry out would be off of pin 1 of the TL072.

      Delete
    2. Thanks!
      So, if I disconect the 22k kills the dry signal?

      Delete
    3. Yes. Though that will mess up the Mix control. The Mix acts as a blend between wet and dry signal. My removing the 22k resistor it will basically turn into a volume control.

      Delete
  33. This comment has been removed by the author.

    ReplyDelete
    Replies
    1. Hi Simon! Look for the pdf here: https://www.dropbox.com/sh/iaegm30zvqgcvp1/AAD0x_GB3EZqRwcwSxW7QBlFa?dl=0
      Inside is sized and ready to print. BTW, the measures are in there

      Delete
    2. and why are the pictures mirrored? i want to make the PCB with the Photoresist Dry Film technique. can i use them just mirrored and I do not care later that the text is mirrored on my PCB?

      Delete
    3. Because when you print with toner in the paper, you'll transfer again in the copper side of the board, so it will be reversed again.
      :-)

      Delete
  34. what specific audio jack will I use in the input and output signal is it mono or stereo??

    ReplyDelete
    Replies
    1. You'll only need to use a stereo jack on the input if you're including a battery in your build. Otherwise mono jacks are just fine.

      Delete
  35. I've done this circuit 3 times. (I jumped pin 3 and 4). Anyway, it always give only clean sound and the first resistor (33 ohm) burns in the first 30 seconds. Any idea?

    ReplyDelete
    Replies
    1. What kind of power supply are you using? Only time I've had a resistor in that position burn is when a positive power supply was hooked up to a circuit. The polarity protection diode blew and so did the power filtering resistor.

      Delete

    2. More than sure that it connects the diode upside down

      Delete
  36. Verify !!

    https://www.facebook.com/mr.fxman/videos/469308610127413/?hc_location=ufi

    ReplyDelete
  37. What enclosure size do you consider to be the best for this?

    ReplyDelete
    Replies
    1. Generally I prefer 125B enclosures. You can probably squeeze it in a 1590B (I think the drill template for this is a 1590B), but you'll have a little extra room in a 125B. It's really up to you though.

      Delete
    2. Thank you!
      Also, great video on perf, awesome production!

      Delete
  38. hola tengo un problema, el sonido pareciera no estar filtrado, hace mucho ruido, como si fuese una distorsion, me puedenn ayudar

    ReplyDelete
    Replies
    1. Hola Gustavo! Fijate si no hay alguna resistencia mala o de otro valor.
      Probaste algún otro PT2399?

      Delete
    2. estoy probando con un CD2399 que supuestamente son iguales. sera ese el problema?

      Delete
    3. Usaste un zócalo imagino, probá con un PT2399.
      No encuentro mucha info sobre el CD

      Delete
    4. voy a hacer eso. Te paso explicar como se comporta el efecto. Lo encendes y no le llega mucha señal porque no se escucha la guitarra pero en un determinado tiempo arranca a sonar de a poco, espero que cambiandole el integrado funcione, no quiero derrochar el circuito. saludos

      Delete
    5. Por lo que contás, pueden ser varias cosas. Entre ellas algún capacitor, alguna resistencia equivocada.
      Revisá todas esas cosas, y fijate si los caps están bien orientados, valores correctos, etc.
      Por ahí se nos escapa alguna resistencia en el lugar equivocado.
      Me pasó en el Leviathan de Madbean; confundí una resistencia de 47k por una de 10k..y sonaba bajísimo.

      Delete
    6. dale lo voy a tener en cuenta.. mirandolo ahora los potes la orientacion de los pines esta bastante mal no se si infiere en algo. pero bueno voy a chekear todo.. saludos y gracias nuevamente por contestar.

      Delete
  39. Hi, I have a problem, the sound seems not to be filtered, it makes a lot of noise, it's like a distortion, it can help me

    ReplyDelete
    Replies
    1. You seem to have made some sort of error in building. Check for any shorts and go through your build with an audio probe.

      Delete
    2. Hi Gustavo, like storyboardist says: maybe it's some short, or any bad resistor?

      Delete
    3. estoy probando con un cd2399 puede que sea ese el problema? gracias por contestar

      Delete
  40. Hi, my Mix control doesn't works. It's like a full wet every time. My feedback control doesn't decrease enough.

    ReplyDelete
  41. Hello and thank you so much again for all the layouts.. Is it possible to have an LED that dims at the rate of the delay?

    ReplyDelete
  42. Hey man I built this (my first pedal) and remarkably it works, and actually sounds better than thought it would. Thank you for making it possible! As it happens I do not have an original mad professor to compare mine to, but was wondering: does this design sound similar? If so, since we wired these by hand, are they comparable to the hardwired models that mad professor makes? Finally do they also use the PT2399 chip? Thanks again :)

    ReplyDelete
    Replies
    1. Yes, this a straight clone of the Mad Professor Deep Blue Delay. And yes it would be comparable to the handwired models, assuming you're using similar quality components to what Mad Prof uses.

      Delete
  43. Right, I used components from Tayda which seemed to work well. I know there are probably better quality parts available, where would you recommend for future reference?

    ReplyDelete
    Replies
    1. I generally get stuff from Tayda. Mouser has good stuff as well.

      Delete