Electromechanical siren questions.

Discussion in 'The Projects Forum' started by stornborg, Feb 27, 2009.

  1. stornborg

    Thread Starter New Member

    Feb 27, 2009
    1
    0
    Hello,

    I have a world war two air raid siren that requires 120/220 VAC. I have been trying to find a simple schematic for a 2-12 VDC curcuit that will allow me to adjust the time that the contacts would be closed and open in a simple relay. Can anyone offer some ideas?

    Or does anyone know where I could find a relay with a such a feature built in?

    Thanks,
    stornborg
     
  2. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    A simple 555 can set both on and off durations, just let us know how long.
     
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