AC voltage regulation help required plz

Discussion in 'The Projects Forum' started by pices2282, May 23, 2009.

  1. pices2282

    Thread Starter New Member

    May 23, 2009
    Dear expert,
    can any body give me a help in a project.Is there any possibility that a circuit detects three different reading of AC voltages like 180,200,220 and operates a single relay(12vdc) on its behalf but one relay at a time.lz help me
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    You can scale the AC input down with a transformer. Use a diode rectifier and capacitor filter to render the AC from the transformer into DC. A voltage comparator (more like 3) can signal when those voltage levels (scaled down) are reached.

    You statement -
    - is not clear. Can you explain further?