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Tuesday, September 21, 2010

Echo Base Digital Delay


This is my version of Ian's(slacker at DIYstompboxes.com) Echo Base PT2399 digital delay with minor alterations. I use JFET switching instead of 4066 CMOS switching. Some time ago I had problems with this CMOS leading my unit to fail and I don't even know why. Haha. Anyway, pot values are; LEVEL, REPEAT, and DEPTH is 100K-audio(you might want to try linear tapered pots on these); TIME is 50K linear taper; and SPEED is 1M linear( but I used reverse log taper on my build, so you decide!).
I use J113 for the JFET's salvaged from an old broken DOD pedal. You can use either J201 or similar. And also I used an 11 volt zener(1N4741) as protection diode. Bypass switching is illustrated in the pdf file.
The layout is very compact, designed to accomodate miniature electrolytics or boxed film capacitors. Layout's verified? Oh yes!

Layout Download
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24 comments:

  1. AnonymousSeptember 23, 2010 at 11:11 AM

    Wow! This is clean and compact Layout! Thanks!
    Ton

    ReplyDelete
  2. AnonymousNovember 15, 2010 at 2:08 AM

    hi there. i had this version built a day ago. it works as it should. nice and compact. fits a 125b easily. i have a problem though, the signal bleeds with the bypass switch off and and tails switch to on. any clues as to why it does that bro? thanks for any tips in advance. :D

    i will be back. lol. ;)

    ReplyDelete
  3. AnonymousNovember 18, 2010 at 5:02 AM

    hi there. after writing the first inquiry (dated 15Nov2010 2:08AM), i sat on the circuit and saw that i missed a diode under one of the switching fet. no more bleeding problem. that's all. thanks for the layout again.

    -maat

    ReplyDelete
  4. A2December 22, 2010 at 11:44 AM

    Hi ! i like all your layout! i have a request! can you make a layout of sans amp california?

    ReplyDelete
  5. rapidriotJanuary 6, 2011 at 9:06 PM

    I already have it but I won't post it this time unless....

    ReplyDelete
  6. UnknownFebruary 7, 2011 at 6:14 PM

    Does anyone have the schematic diagram of this version with JFETs??

    ReplyDelete
  7. AnonymousMay 19, 2011 at 3:35 AM

    i have build this echo but i dont know ctrl 1 n 2 to connect...now project echo is pending...(rex)

    ReplyDelete
  8. rapidriotMay 19, 2011 at 6:57 AM

    Wiring diagram of CTRL 1 & 2 is shown at page 2 of the pdf..

    ReplyDelete
  9. AnonymousMay 21, 2011 at 7:31 PM

    ooo he he..im sorry i dont see..tq very much RAPIDRIOT...(rex)

    ReplyDelete
  10. AnonymousJune 2, 2011 at 3:14 PM

    Sorry but i think that this is the schematic of "rebote delay" from tonepad. Isn't really the same with echo base delay effect.

    ReplyDelete
  11. Arlerole CopkingsSeptember 7, 2011 at 5:53 AM

    I hope I can have our drummer make me my own DD clone with this. Ahh, the perks of knowing someone who studied electronics! If only there's a downloadable schematics for that Giga Delay. Hahaha!

    ReplyDelete
  12. Daniele S.December 27, 2011 at 4:29 AM

    hi, I built the pedal and it works, but i have a lot of noise in the repetitions :(
    What to do?

    ReplyDelete
  13. AnonymousDecember 27, 2011 at 3:05 PM

    Do you have removed the CMOS of this layout. Thanks

    ReplyDelete
  14. Folco P.January 8, 2012 at 1:02 PM

    Hi, me too I've built this very good delay but I'm having a real big noise from repetitions when I set feedback higher than 1/4. I've used your nice and compact layout, components are fairly good ones (metal film resistors etc etc).Could the noise be generated from the PT2399?
    Thank you!

    ReplyDelete
  15. AnonymousSeptember 10, 2013 at 9:23 AM

    I have a question, when you say you had problems with the 4066 what do you mean? I used anonymousfacelesscoward's layout and I'm getting a dry signal with some hiss, I tried replacing all ICs and checked all solder joints and everything seems to be fine, do you think it could be related to the switching system and maybe this layout could fix that?

    ReplyDelete
  16. UnknownDecember 28, 2013 at 10:23 AM

    This comment has been removed by the author.

    ReplyDelete
  17. UnknownDecember 28, 2013 at 10:27 AM

    I am puzzled which way round are the diodes placed??

    ReplyDelete
    Replies
    1. AnonymousDecember 29, 2013 at 11:10 AM

      The cathodes in the square points

      Delete
  18. UnknownDecember 29, 2013 at 11:17 AM

    I built this and sounds great!!!
    But I want to insert the Clean Signal Kill Mod and can't indentify which 10k resistor I have to take.
    Anyone?

    ReplyDelete
  19. UnknownJanuary 13, 2014 at 11:16 AM

    I have built this circuit and I`m find there is a continuous noise on the output when thee is no input present also the bypass and tails dose not appear to be doing anything.

    Any clues to as what might be causing it. There also seems to be no circuit diagram for this design. The link next to pcb layout brings up a blank page.

    Any help will be appreciated.
    Thanks

    ReplyDelete
  20. UnknownMay 18, 2014 at 11:01 AM

    plz somebody guide me how i can download this pdf file.

    ReplyDelete
  21. UnknownFebruary 2, 2016 at 7:46 PM

    I need some help with this build, could you tell me approximate optimal voltage values? I coulda also post mine, getting signal through but it's clean, not delay,pots don't do anything and neither does the switch.

    ReplyDelete
  22. AnonymousApril 3, 2020 at 10:46 PM

    download link is broken.. ��

    ReplyDelete
  23. chinmoy1955October 10, 2021 at 9:12 PM

    What's the idea of posting this shit? Cannot download because "Invalid Download Link"....
    No circuit schematic.
    Please remove it if you are not interested to share the stuff!

    ReplyDelete

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