Home › Forums › Vintage EHX › How to add CV/EXP input to an old EHX The Worm?

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  • September 10, 2018 at 7:57 pm #85466
    radubor
    Member

    Hello!

    I saw that the new EHX The Worm has an expression pedal input, which can be used as CV input, too. I am curious if the old (big box) model can be easy modified in order to have an EXP/CV input? More clear, I want to use Korg SQ-1 sequencer instead of the internal LFO. It is possible?

    Sometime ago, Puretube posted how to add an expression pedal (https://www.diystompboxes.com/smfforum/index.php?topic=73245.msg602406#msg602406), but it seems to me that he replaces the Range pot with an expression pedal.

    Moreover, Puretube said in a post that the initial variant of The Worm had Mix and Resonance pots, but they were replaced by fixed resistors. Looking at the schematic from http://www.freestompboxes.org/download/file.php?id=1582&mode=view it seems to me that R27 (100K) is the feedback resistor, but I have no ideea which ones are the resistors for mixing.

    Schematic:

    Can anybody help me?

    October 13, 2018 at 6:06 pm #124391
    Chrisfromiowa
    Participant

    Have you opened up your Worm yet? Interested in trading for the new version? After getting a worm in a trade I realized I’ve already got 6 pedals with expression added and I’m having to construct a whole new pedal board just for the foot treadles… Continental US? Have you got the resistor thing figured out, I’d be interested in knowing your results. Thanks

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