24 Vac 2hz voltage pluser circuit

Discussion in 'The Projects Forum' started by Stile2112, Jul 18, 2014.

  1. Stile2112

    Thread Starter New Member

    Jul 18, 2014
    Looking for a circuit that will output the 24 Vac incoming voltage 2 times a second.

    The idea is to make the solenoid plunger in an irrigation valve "chatter" in situations where the valve is buried and unable to be visually seen.

    The inrush current would be 500mA.

    Would a 555 circuit work or is the voltage to high?

    EDIT: The incoming voltage could be rectified to give a DC output
    Last edited: Jul 18, 2014
  2. crutschow


    Mar 14, 2008
    You could use a 555 timer but you would need to use a regulator to reduce the rectified 24VAC (which gives about 33VDC) to no more than 15V output (18V max. for the 555). The 555 could drive a SSR (Solid State Relay) to control the 24VAC voltage to the valve.
  3. inwo

    Well-Known Member

    Nov 7, 2013
    Is this just for testing?

    Then just get a 24vac repeat cycle timer or multi-function timer.

    No other parts needed.

    The output relay wouldn't last long term.

    Dc one shown. Ac available.