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Monday, March 6, 2017

Death by Audio Echo Dream 2

Gotten a lot of requests for this one. I've put it off because the schematic that's out there isn't exactly straight forward, not to mention it's 7 pots, 2 switches, 3 ICs... You get the idea. Anyway, I wanted to keep this 1590BB friendly, so all the pots are board mounted... except one (Blend). Six out of seven isn't bad, I reckon. haha


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69 comments:

  1. plushMarch 6, 2017 at 10:08 AM

    i was waiting for it

    This one is very strange actually, XR definitely lacks voltage to operate correctly, when powered by 9v it does not generate any wave. Better power it with 18volts, but it may overheat 5v regulator...

    Anyway, magnificent job, as usual.

    ReplyDelete
    Replies
    1. Ian H NelsonMarch 6, 2017 at 7:54 PM

      I'm looking at the 78L05 datasheet and it looks like the max input voltage is 35V. I'm by no means an expert on reading datasheets so I may be wrong about this...

      Delete
    2. plushMarch 7, 2017 at 6:23 AM

      Yep, Ian, you are right.
      My bad.

      Delete
  2. Ian H NelsonMarch 6, 2017 at 11:06 AM

    Sweet! This is one on my bucket list, I was thinking about doing the Vero version, but wiring 7 pots offboard... Ugh. Thanks man!

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  3. IvMMarch 6, 2017 at 12:14 PM

    Thanks!!! On that...!

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  4. IvMMarch 6, 2017 at 12:43 PM

    TL072 would work in place of MC33172P?

    ReplyDelete
  5. Ian H NelsonMarch 6, 2017 at 5:06 PM

    Do you do the drilling templates in Eagle?

    ReplyDelete
  6. UnknownMarch 7, 2017 at 11:18 AM

    Just to let everyone know, there had been issues at the tagboard forum with powering this effect at 9v. the xr2206p chip's says on it's datasheet that it's operating voltage is from 10v to 26v, so a lot of people had reported that the modulation section was not working when using 9v batteries or power supplies. They recommended just making a simple voltage doubler and powering it at 18v!

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    Replies
    1. UnknownMarch 7, 2017 at 5:56 PM

      Those charge pumps give me endless grief :\ Though the klon clone I made from a layout here works fine.

      Delete
  7. UnknownMarch 7, 2017 at 11:22 AM

    oops i didn't read that first comment :p

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  8. FriscoMarch 7, 2017 at 6:21 PM

    This comment has been removed by the author.

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  9. FriscoMarch 7, 2017 at 6:26 PM

    DBA released the Micro Dream recently! It seems like a (twisted) stepson of the Echo Dream. I'll be waiting that layout for sure! Haha

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  10. estivenMarch 8, 2017 at 8:57 PM

    hi excellent layout but remplacement of XR2206P?? please thanks so much

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    1. IvMMarch 9, 2017 at 8:44 AM

      Sorry, Esteban; there isn't a replacement.

      Delete
  11. MiquelMarch 27, 2017 at 1:10 AM

    1 2 1 4
    3 4 2 5
    5 6 3 6??

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  12. RyanMarch 30, 2017 at 9:52 PM

    Fuzz knob isn't doing anything on my build. Everything else is peachy. Too tired now to troubleshoot, if anyone has any ideas, let me know.

    ReplyDelete
  13. plushApril 1, 2017 at 1:21 PM

    4 wires must be connected to sw1
    but layout has pads only for 3

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    Replies
    1. Effects LayoutsApril 1, 2017 at 5:23 PM

      One of the pads goes to 2 lugs of the switch. You don't really need an extra pad. Just run a wire between lugs 3 and 6 and a wire from there to the board.

      Delete
    2. plushApril 3, 2017 at 5:19 AM

      No, there should be at lest 4th wire.

      There is no point in using 2 contact groups in DPDT with 3 wires and 1 jumper like this: http://i.imgur.com/m92ka6l.png - it makes no sence, jumper between 3 and 6 does literally nothing ;-)
      Even if you place it between 3 and 4 or 3 and 5, it will still do nothing since pins 2 and 5 are not connected to each other.

      Delete
    3. Effects LayoutsApril 3, 2017 at 12:25 PM

      I'm with you now. Yeah, there was a 10k resistor from the voltage to switch pins 4 & 5. Updated the layout and it should be good now. Thanks for catching that.

      Delete
    4. RyanApril 3, 2017 at 8:47 PM

      So you switched the 4.7k resistor to 10k and have the former LED+ going to switch 1, 4 and 5 correct? Was there any other changes?

      Delete
    5. Effects LayoutsApril 3, 2017 at 11:27 PM

      Other than moving the LED resistor over to the left, no.

      Delete
  14. raduandroidulApril 11, 2017 at 11:50 AM

    Hi all!

    I've just finished the DBA Echo Dream using this layout and I have some troubles:
    1. the Fuzz pot do nothing (no fuzz)
    2. the Depth pot have a little effect (and it never goes to 0 for unmodulated signal).
    3. the overall volume is under unity
    4. the switch 2 acts strange in a position

    I tried MC13382 and other op-amps instead MC13372, with no luck.

    Anyone built it succesfully?

    Thank you very much!

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    Replies
    1. RyanApril 11, 2017 at 12:37 PM

      Same exact problems that you had. I gave up on trying to figure it out.

      Delete
    2. raduandroidulApril 11, 2017 at 3:58 PM

      I will try to recheck the PCB as soon as I will have some time...anyway, the schematic from FSB is a little unclear to me...and I have limited electronic knowledges.

      Delete
    3. RyanApril 12, 2017 at 8:45 AM

      What voltage are you running at? I am using a 555 charge pump and wondering if the 18 volts might have fried something in the chain? Also, what voltage are your electrolytic caps rated at?

      Delete
    4. raduandroidulApril 12, 2017 at 10:15 AM

      I'm running it at 18V (a Dunlop power supply), because I used electrolytic caps rated at minimum 25V. As I read on other forum, it must be OK

      Delete
  15. raduandroidulApril 12, 2017 at 1:50 PM

    I found first mistake in the schematic from FSB: the 220nF is only 220pF!!! The value of 220nF for a cap in a feedback loop of an op-amp is ridiculous and kills all signal. In the hand drawn version the cap is 221, but in the redrawed version it becomes 224.

    Now, the Fuzz pot acts OK and the overall volume it's OK when you set the Fuzz pot at 8-9 o'clock (which is normal, because the Fuzz pot is esentially a gain pot).

    Anyway, the Depth pot has almost no effect and the switch for the sine waveform sounds horrible (for the rectangle waveform sounds nice).

    ReplyDelete
  16. raduandroidulApril 14, 2017 at 4:44 PM

    I found a mistake in the layout: the SW1-2 must go to pin 2 of the Depth pot (instead of pin 3, as is). Now the Depth pot works OK, but I am not sure if SW1 works OK or not (it sounds a little strange for my taste on the sinewave side).

    ReplyDelete
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    1. JiomyApril 20, 2017 at 9:04 AM

      This comment has been removed by the author.

      Delete
    2. JiomyApril 20, 2017 at 9:59 AM

      This comment has been removed by the author.

      Delete
    3. JiomyApril 20, 2017 at 10:04 AM

      This comment has been removed by the author.

      Delete
  17. JiomyApril 20, 2017 at 7:14 AM

    I believe that both 220nf and 47nf are wrong and in their place must be 220pf and 470pf....although in tagboard and effects the 470pf is connected with the in pad!

    ReplyDelete
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    1. JiomyApril 20, 2017 at 7:43 AM

      This comment has been removed by the author.

      Delete
  18. MiquelApril 26, 2017 at 3:14 PM

    Hello everyone, today I finished mine with the suggested changes of the two capacitors, sounds great.
    Just have a problem, you hear the clock, I do not know if it's echo or modulation, any suggestions?
    It's a fantastic pedal, thank you!

    ReplyDelete
  19. UnknownSeptember 18, 2017 at 7:29 PM

    You can mark this as verified! It fired up right away with the change of caps mentioned above but needed some things to be changed too for this guy to reach his full potential.So i will mention all those things above:
    1. Change of caps 220nf (near the fuzz pot) to 220pf AND 47nf (above the input) to 470pf
    2. Sw1-2 to Depth lug 2 so you can activate the depth pot otherwise it will be all the time at full.
    3. XR2206P operates fully between 10 and 24 Volts , at least according to it's data sheet, so i put a 555 Charge pump just to see how this affects the circuit and...boom!! At 9Volts i could get a saw waveform (kinda odd and a little crazy if you ask me) and a squareish from the modulation section. At 18Volts you get a pure singing sine waveform and a strong sqare wave.
    I wanted for so long to build this pedal , so thank you so much for helping me achieve that man!!!
    Jiomy

    ReplyDelete
  20. UnknownSeptember 30, 2017 at 11:26 AM

    Can anyone post a demo video? I'm interested to see how they sound!

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  21. jojo ZhangFebruary 21, 2018 at 9:34 PM

    I have a question: the capacitance of 32nf is very difficult to find. Can you use 33nf instead?

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  22. JiomyFebruary 25, 2018 at 9:43 AM

    Still unverified? Do i have to post a video to verify it?

    ReplyDelete
  23. jojo ZhangApril 2, 2018 at 12:22 AM

    Hi,when I use a depth, there will bi obvious out-of-tune,rather than normal waveforms, why?

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    Replies
    1. JiomyApril 9, 2018 at 4:45 AM

      Sw1-2 to Depth lug 2 so you can activate the depth pot otherwise it will be all the time at full.

      Delete
  24. FreshaJuly 1, 2018 at 1:39 AM

    Just built mine up everything working except for xr2206p... Does anyone know where to get 2206 voltage readings table from?

    ReplyDelete
  25. FreshaJuly 23, 2018 at 2:15 AM

    Found the problem re XR2206P.. got a couple of fake chips unfortunately so ebay'd the function generators and works well. Sinewave seems like a double step square wave (up normal down normal up ...) while square seems posi square (up normal up normal) so will play with the sinewave resistor (10k might need tweaking?)

    ReplyDelete
  26. UnknownAugust 27, 2018 at 12:16 PM

    it possible to make the micro dream delay from this circuit as well? I assume just include the controls for feedback delay and volume right? How could we do that?

    ReplyDelete
  27. UnknownOctober 12, 2018 at 4:13 PM

    Hi ! I've just finish mine ! Very good job ! The normal echo is working very well but the modulation doesn't work.
    The speed knob don't have any effect.
    Have you got an idea ? Thks !

    ReplyDelete
    Replies
    1. UnknownOctober 13, 2018 at 9:00 AM

      When i turn the depths pot, it modify the speed of the echo, the speed doesn't do anything and when i turn the switch in square mode, i'm losting the first signal (dry?), i've only echos.

      Delete
    2. UnknownOctober 13, 2018 at 11:04 AM

      I'm runing it in 9v with a 555 charge pump, i've 17,5v when the circuit is not connected, and i've a voltage drop to 14,5v when i connect it.

      Here are my voltage :
      33172 :
      5,1 10,2
      5,1 . 5,1
      4,8 . 5,1
      0 4,8

      Pt2399
      5 . 2,5
      2,5 . 2 5
      0. 2 5
      0 . 2,5
      2,2 . 2,5
      2,5 . 2,5
      0,7 2,5
      0,7 2 5

      2206
      0 . 1
      5,1 1
      5 7,7
      10,2 8
      10,2 . 0
      9,9 . 2,4
      3,4 . 3 5
      4,3 1,5

      Delete
    3. Chris PNovember 19, 2018 at 6:04 PM

      The same with me... Modulation is not working.

      Delete
  28. LeeNovember 10, 2018 at 1:43 PM

    This comment has been removed by the author.

    ReplyDelete
  29. Chris PNovember 27, 2018 at 4:13 PM

    Everything works (echo, fuzz) except modulation. It could be issue with fake 2206 chip? When I first time plug power on (18v) 100ohm resistor started to be very hot. I removed xr2206cp and it was ok. Then I inserted 2206 and it happen again. I inserted another 2206 (have two pieces) and it happen again. Just had read about issues with fake chips on web.

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  30. MiquelNovember 30, 2018 at 10:39 AM

    Verified!!!

    ReplyDelete
  31. Chris PDecember 17, 2018 at 4:12 PM

    Bought another 2206 and everything started! Now modulation works! Verified, thanks a lot brother!

    ReplyDelete
    Replies
    1. Chris PDecember 17, 2018 at 4:24 PM

      Just to mention it - verified with the changes mentioned above by Jiomy.

      Delete
  32. UnknownMay 26, 2019 at 9:31 AM

    Great job! Thanks, everything is working!

    ReplyDelete
  33. FuzzDogJune 11, 2019 at 6:08 AM

    kudos on managing to interpret the schematic that's out there. I was about to put a board together but wow. that's some indecipherable stuff.

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    1. FuzzDogJune 11, 2019 at 6:13 AM

      trying to compare your layout to the schem. Switch 1-2 seems to connect to depth-wiper on the schem, and you have it on pin 3. have i missed a better schematic somewhere?

      Delete
  34. UnknownJanuary 18, 2020 at 1:58 PM

    Does anyone have the schematic lying around. Would like to check it out and compare to try and breadboard this out first.

    ReplyDelete
  35. iuciucFebruary 29, 2020 at 7:00 PM

    all seems to work well except for the time knob, if the time knob is set to 0 I hear a strange throbbing pulse under my normal signal..

    ReplyDelete
  36. o.รง.June 22, 2020 at 12:07 PM

    verified! but that was a very tricky build.
    first of all, like the older comments said; i changed the 47nf and 220nf, connected the sw1-2 to depth 2 and they were all correct. and i finished the build with a (probably fake) cheap(2$) xr2206cp. as expected, the modulation part didn't work. but a few days ago, after a detailed research i found an original xr2206p in my country and it was about 6$. just tried the circuit with it, and now everything works like a charm. so yes, this layout is very picky on the modulation ic. try to find an original one.

    ReplyDelete
  37. UnknownAugust 14, 2020 at 11:00 AM

    Verified! Made one used the advices about caps and sw1, powered by charge pump and it works! Designing an enclosure now, with a button for infinite feedback, great pedal! Thanks!

    ReplyDelete
  38. UnknownNovember 27, 2020 at 6:08 PM

    I think the 1uF at the Master pin 3 should be the other way round.

    ReplyDelete