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, 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.


14 comments:

  1. 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.

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    Replies
    1. 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?

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    2. 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.

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    3. 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.

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

    ReplyDelete
    Replies
    1. Usual 4148 can be used although they might sound a tiny bit different

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  3. what is that 8.2v diode? equivalent??

    thank you,great layout!

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

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

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

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  5. 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.

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  6. BAT46, what I can replace it with?

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