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Discussion in 'Troubleshooting and Repair' started by moonloopsun, Dec 17, 2020.

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  1. moonloopsun


    Aug 16, 2020
    Hi guys.
    i hope that someone can help us.

    We moced to a new flat and installed an audio system in a room where we have 4 Shutters that are driven by a Shelly 2.5 relay.
    the problem is that when the relays are starting or stopping the engine the turntable‘s preamp is picking a spike pop noise and amplify it.
    we tried everything from the audio system‘s side (electric filters, surge suppressors, different cables...),

    On the relay side the only thing we tried is to to wrap the cables with Ferrite clips.
    we don’t know if the spike sound is created by the relay itself or the Shutters engine.
    but we can’t use our sound system because those amplified pop sounds can destroy the speakers.
    wirth to mention that in this room there is also a motorized beamer screen running by a different type of relay and it creates the same problem..
    is there anyone that could possibly help us to understand what we have to do?

    thanks a lot for your time.
  2. Martaine2005


    May 12, 2015
    Hi , what filters did you try? Can you link to them?.
    You may need an in line filter between the turntable and amp. These can be bought with RCA’s for direct in-line coupling.
    Depending on your audio setup, you can also install these filters between a mixer and amp.

  3. Bluejets


    Oct 5, 2014
    Start by plugging in to a different power circuit.
  4. Tha fios agaibh

    Tha fios agaibh

    Aug 11, 2014
    I'd add a snubber circuit across the relay contacts.
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