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.

Wednesday, July 5, 2017

Zombie Chorus

Got a request for this one. This was originally designed by John Hollis and has since been modified by various folks in the DIY community. Like the latest version of the Little Angel chorus, it has a switch to do either vibrato or chorus tones. And the Mode switch allows for different speeds (Leslie, Normal, and Clone). Here's the schematic for reference.


17 comments:

  1. Beautiful layout, the big problem will be finding this MN3007 that is obsolete, any suggestions? Thank you

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    1. They can still be found on ebay and other places online. As Mitsos says below, the MN3207 is a replacement, but doesn't have the same pinout.

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    2. the pinout is the same BUT the only difference is the voltage the mn3007 uses negative power and the mn3207 uses positive in 90% of the designs the mn3007 takes the positive but in reverse 9 vols goes to pin 1 thats the pinout difference although you cant say it pinout difference but power difference anyway
      a mn3207 zombie would be cool to have

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  2. LOL Love the zombie on the transfer board .. will do this. thanks.

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  3. nice layout but why go with the mn3007 and not the mn3207 which is available everywhere and easier to obtain?

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    1. Because the schematic called for a 3007. I'm not the circuit designer. And I've heard conflicting things about the 3207 with regards to noise levels.

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    2. nope thats just myth i have used many times the mn3207 as an alternative for the mn3007 with some changes ofcourse without any noise just reduce the voltage a bit a aseries diode on the 9 volts and it would be awesome

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    3. cool to share your conversion MN3207 to mn3007?
      btw, i just found from ExpAnon :o
      http://experimentalistsanonymous.com/diy/Schematics/Chorus/Zombie%20Chorus%20MN3207%20Based.jpg

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  4. Really Really 3207 and a bit noisy, but would be an alternative, worth the pins being different

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  5. Too bad the pots are not board mounted but I guess it's not that easy.
    Thank you anyway for this layout!

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  6. is the layout available in the transfer library?
    if yes where is it?

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  7. ok i build this and to save a lot of trouble shooting for some people
    the lfo section it misses two crusial parts and has one that in unnesecary
    the 10k resistor below the 4M7 resistor must be replaced with a 10nf cap
    and also the resistor that is missing is 100k from pin 1 to pin 3 of the lfo
    and maybe the pots needs to be changed into linear i will report back when i test this one
    i am also working on some mods on how to replace the mn3007 with a mn3207 that i will hapilly share
    cheers from greece

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    Replies
    1. the pots must be changed to 100k linear (b100k) it will give better control over the effect

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  8. Love the sound of this pedal, but i prefer pcb with mounting potenciometers. Please with mounting pots. :(

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    Replies
    1. did you build it with my corrections?
      also if you build it where did you find the mn3007?

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    2. hello! i have the mn3007. How do you What went wrong when you built it that make you do those changes. Sorry my english ha ha

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