555 Delay Power Off

Discussion in 'The Projects Forum' started by coryfoss, Jun 27, 2011.

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  1. coryfoss

    Thread Starter New Member

    Jun 17, 2011
    I found this schematic online and figured it would work perfect for my application. I am running a circuit with a 9V and after a set amount of time the circuit and current load on the battery will be disconnected. I breadboarded this circuit exactly as shown, but the load would never disconnect. It was on as soon as the 9V was connected without pressing S1. Did I do something wrong. According to what I read it should work as follows.

    S1 is closed; circuit powers up and supplies power to load.
    S1 is open: 555 starts timing based on RC combo
    At the end of the delay power to load and battery is removed.

    Any info would be appreciated.
  2. #12


    Nov 30, 2010
    You have the same post in "chat" This is a no-no.
    The bosses will soon eliminate one of them.
    Just so you know what's happening.
  3. SgtWookie


    Jul 17, 2007
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