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12 vdc to 6 vdc input stability

Discussion in 'Power Electronics' started by bjbarbata, Mar 22, 2018.

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  1. bjbarbata


    Mar 22, 2018
    I am trying to operate a vintage 6 vdc siren from my 12 vdc boat system. It's got what looks like 16 ga wires on it, and a motor about 3" diameter, so I'm guessing it might draw like 10 amps (is there a way to be more accurate?). There are plenty of 12-6 volt converters, and I was about to buy a 15 amp one when I read a comment from someone very technical who said the INPUT draw spiked the rest of their 12 vdc circuit and "fried" some sensitive electronics. I have several sensitive pieces of equipment (engine computer, and others) on my main 12vdc circuit, so this has scared me a little. I don't need to hit the siren and have everything die! Is there a device or a way I can make sure my 12 vdc circuit remains stable when I hit the siren?
  2. BobK


    Jan 5, 2010
    A 6V battery and charger?

    Harald Kapp likes this.
  3. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    2 of these in series?
  4. ChosunOne


    Jun 20, 2010
    Wow, a motor-driven siren really IS vintage. I've been working with sirens for decades and only remember coming across one system that used a motor-driven, more than 25 years ago. It was ancient at the time.

    I endorse BobK's suggestion, with the recommendation of powering the 6V charger from your boat 12V supply, and using a relay to disconnect the 12V charging supply while the siren is being driven.

    Alternately, it might be enough to put a suitable MOV across the siren input, to suppress spikes.
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