Saturday, 10 September 2016

Earthquaker Devices Grey Channel

A dual overdrive based on the classic grey spec DOD 250.
The schematic didn't come from the original EQD pedal.
David has recreated the circuit on his website (Perf & PCB Effects Layouts).
You can find his original and verified layout here.


15 comments:

  1. Verified! Pretty cool sounding pedal. Cheers Alex.

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  2. yep, the germanium option is pretty awesome I think. (1n34a from tayda works well in this)

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  3. Very nice to have so many different clipping options in one pedal, they all offer something unique too. I added a switch to run channel B into channel A for even more options, the germanium side pushing the MOSFET side is an epecially nice crunchy distortion.

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  4. Anyone tried this as a bass overdrive? I'm keen. If not I guess it's mod time ­čĄś

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    1. Did you have any success adapting it to bass?

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  5. Quick question: I understand the basic layout conventions, including the board, components, cuts, and links, but there's one symbol I don't get: in the link on the far right, there is another symbol about halfway down the line, like a small circle that interrupts it (repeated on the link to its left). What does this indicate?

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    1. It indicates that this link joins 3 strips.

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  6. Another Quick Question: In the Channel Ftsw, the center pole you said +9v, but in other site I saw GROUND. The other contacs are exactly the same, but this one is ground. It's wrong?

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    1. It would differ depending on whether you use a common cathode bicolor LED or a common anode bicolor LED. No difference in the audio part of the circuit

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  7. Hi all.
    Don't know if I'm missing something but I can't find spst on off on switches anywhere (I'm in the UK).
    Is it definitely spst and not spdt?

    Cheers

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  8. Is a CLR required on the red/green channel footswitch? Would it be one for each positive leg?

    Cheers
    Liam

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