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Tuesday, August 13, 2019

Keeley El Rey Dorado

Here's another Plexi-in-a-box overdrive, this time from the great Robert Keeley. It's a cascaded opamp design running on a bipolar +/-9v supply. The Power Toggle as it's known on the original selects between red LEDs or BAT46s for asymmetrical clipping.


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15 comments:

  1. morbido13August 22, 2019 at 9:46 PM

    Verified.

    Althought I had to do a small mod to make it work.
    I don't know if the problem were my caps or the LT1054 I used but it didn't gave me the -9V until I did this:

    https://221bpedals.files.wordpress.com/2019/08/el-rey-dorado-mod.jpg

    Sounds great!

    Thanks for another awesome layout.

    ReplyDelete
    Replies
    1. Effects LayoutsAugust 23, 2019 at 11:08 AM

      That's weird. It didn't work with the 100uF cap from -9 to ground in the original location but did in your modified spot?

      Delete
    2. morbido13August 24, 2019 at 4:52 AM

      Yep, as I said I don't know if there was a problem with the cheap chinese cap I used, but I tried 3 different LT1054 and kept getting weird negative voltages like +8.2 and -1.2.
      I checked for bridges or cold solder spot and found none.
      Then I pulled the cap off and tried a new one on that other spot and it worked.
      I was too lazy to try and put it on the original place.

      Delete
    3. Effects LayoutsAugust 24, 2019 at 3:20 PM

      Weird. Though if you're using a 1054 you don't need to connect pins 1 and 8. Wonder if that has anything to do with it.

      Delete
  2. Lucas1448August 28, 2019 at 11:38 PM

    What can I use to replace de bats? I can't get them in my country

    ReplyDelete
    Replies
    1. LalaLandSeptember 1, 2019 at 3:32 AM

      Usual 4148 can be used although they might sound a tiny bit different

      Delete
  3. naderSeptember 3, 2019 at 8:30 AM

    what is that 8.2v diode? equivalent??

    thank you,great layout!

    ReplyDelete
    Replies
    1. Effects LayoutsSeptember 3, 2019 at 10:20 AM

      It's a 8.2v zener diode. Several options out there, just google for a specific part number.

      Delete
  4. UnknownDecember 10, 2019 at 1:00 PM

    Hey Guys, can somebody help me out?
    I put it together and it makes an awful whistling.
    Converter is 7660s cpaz. Any ideas?

    ReplyDelete
    Replies
    1. Emre EfendiDecember 23, 2019 at 5:27 PM

      Probably your 7660 is not really the "S" version, but a fake one. You can substitute it with LT1054.

      Delete
    2. UnknownJanuary 3, 2020 at 4:22 PM

      Thanks man!! It was a fake one, got the original. Thanxxx

      Delete
  5. UnknownDecember 19, 2019 at 12:53 PM

    Anyone?

    ReplyDelete
  6. UnknownFebruary 10, 2020 at 5:53 AM

    Hi! I noticed that you missed the 22k resistor in parallel with the 39nF capacitor.
    It can be placed between the TONE (1) and LEVEL (3) pins.
    Although, everything works without it :)
    But on the scheme it is.

    ReplyDelete
  7. iYungJuly 25, 2020 at 9:39 AM

    BAT46, what I can replace it with?

    ReplyDelete
  8. UnknownApril 24, 2022 at 10:32 PM

    ta faltando o resistor de 22k com 39nf

    ReplyDelete