Home › Forums › Vintage EHX › I fried my electric mistress :-(

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  • April 22, 2023 at 11:46 am #198593
    pleyadiano
    Participant

    Hi there,

    I couldn’t be more silly, and I fried a v5 electric mistress with wrong polarity :S, there was burnt smell, and now it does not work at all.
    Reading trough the forums I’ve seen that the lm741 and the zener are probably gone, so I replaced both of them, but when testing the voltage, I get at the zener 18v, and also 18v at almost every pin on the lm741, so no voltage regulation at all.
    Am I doing something wrong?(probably :D) what am I missing?

    Any help would be really appreciated, I love this pedal and would like to bring it back to life.

    Many thanks

    April 22, 2023 at 12:28 pm #198594
    The EH Man
    Moderator

    There’s a transistor on the power supply output that probably needs changed as well.

    April 22, 2023 at 12:28 pm #198595
    The EH Man
    Moderator

    There’s a transistor on the power supply output that probably needs changed as well.

    April 22, 2023 at 1:37 pm #198596
    pleyadiano
    Participant

    thanks so much for the reply! I will have a look at the schematic to find out 🙂

    April 23, 2023 at 10:51 am #198599
    pleyadiano
    Participant

    Small update, I’ve replaced the BC309 also, and no luck, I don’t really understand how is it possible that I’m getting readings of 18v in all the pins of all the all the IC chips, and basically everywhere in the circuit. I’ve even tested with another pedal to see if there’s something wrong with my multimeter, but those came fine.
    Really lost with this, any help appreciated.

    Cheers

    April 23, 2023 at 2:37 pm #198600
    The EH Man
    Moderator

    I really hate that power supply design. I usually disconnect it and install a small PCB with a variable voltage regulator set for 13v.

    April 23, 2023 at 3:24 pm #198601
    pleyadiano
    Participant

    Many thanks for the suggestion 🙂 I’ll investigate that option

    cheers

    September 11, 2023 at 8:49 pm #204507
    Ned Flanders
    Moderator

    http://www.metzgerralf.de/elekt/stomp/mistress/electric-mistress-v5.shtml

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