Home › Forums › Vintage EHX › [Electronic Art] SPIRAL – Electro Harmonix – 1979

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  • January 23, 2020 at 6:43 pm #86114
    Cecco
    Participant

    Hi All!

    I found this: https://imgur.com/a/kQ8xWVO

    do you have some info about this device of electronic art?

    It has 2 jacks, I don’t have the power supply. I suppose 1 jack is for power and the other for the line in. But there isn’t write what they are.

    do you have some schematics or manual?

    thank for your time and your help

    Giulio

    January 23, 2020 at 7:38 pm #125762
    The EH Man
    Moderator

    Very cool! I’ve never even heard of this before. I would guess 9vdc with a positive tip. The other jack may be for controlling it with a signal rather than sound activation.

    January 23, 2020 at 7:57 pm #125763
    Cecco
    Participant

    I think I’ve found the patent:

    https://patentimages.storage.googleapis.com/90/b4/df/cff83d2c9c6b1e/US4264845.pdf

    https://patents.google.com/patent/US4264845A/en

    January 23, 2020 at 9:05 pm #125764
    The EH Man
    Moderator

    Pretty nifty! I’d love to see it in action!

    January 24, 2020 at 11:51 am #125767
    The EH Man
    Moderator

    I just remembered that if you remove the bottom cover, you may find a connector for the battery. The enclosure is very similar to the one used for the Mini Synth.

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