I need help with a project!

Discussion in 'General Electronics Chat' started by vinny8765, May 28, 2012.

  1. vinny8765

    Thread Starter New Member

    May 28, 2012
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    I'm an electronics newbie but I understand most of the vocabulary any how for my project I'm trying to open a 24V electronic valve(works with 18V) for a certain amount of time like for example 3/4th of a second with a Lm555 IC. How would the schematic look like?
     
  2. absf

    Senior Member

    Dec 29, 2010
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  3. Bernard

    AAC Fanatic!

    Aug 7, 2008
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    Do you have an 18V source?; AC or DC & is valve AC or DC?
     
  4. vinny8765

    Thread Starter New Member

    May 28, 2012
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    Yes, two 9 volts batteries in series and the valve is AC i believe
     
  5. tracecom

    AAC Fanatic!

    Apr 16, 2010
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    Batteries are DC and won't operate an AC device.
     
  6. vinny8765

    Thread Starter New Member

    May 28, 2012
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    I've made a simple circuit with the batteries hooked up to a switch and manage to open the valve and close the valve even with it holding back 120 psi. All I want it to do is when I press a momentary button is to open the valve for a certain amount of time
     
  7. tracecom

    AAC Fanatic!

    Apr 16, 2010
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    How to do what you want depends mainly upon the power requirements for the valve. Post the part number and manufacturer of the valve, or better yet, post a link to the data sheet for the valve. Someone here can help.
     
  8. vinny8765

    Thread Starter New Member

    May 28, 2012
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    Orbit sprinkler valve model #57041. I wasn't able to find a pdf of it or at least a link. All I know is it's a 24V AC 50/60cycle Solenoid
     
  9. Bernard

    AAC Fanatic!

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    DC resistance is about 20Ω, so will draw a little more current on DC than AC, 900 mA @ 18V DC.
     
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  10. Bernard

    AAC Fanatic!

    Aug 7, 2008
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    Needs review: Only a little leakage current when off. U2 can be NPN invertor, 2N3904, 555 or 1/2 556 with new #s. Any questions??
     
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  11. vinny8765

    Thread Starter New Member

    May 28, 2012
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    none so far thanks for all your help!:)
     
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