time delay

Discussion in 'The Projects Forum' started by ankur_s06, May 29, 2011.

  1. ankur_s06

    Thread Starter New Member

    May 29, 2011
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    hey guyz i am trying to build a circuit for generating time delay of 10s but the thing is i want to do it without using 555..is it possible.??how?i want to basically use it with a solenoid forflushing purpose
    tnx
     
  2. Kermit2

    AAC Fanatic!

    Feb 5, 2010
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    YES. Use a micro controller. PICAXE is a common one. Google them up and read all about them.
     
  3. KJ6EAD

    Senior Member

    Apr 30, 2011
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  4. CaptainPrice

    Active Member

    Aug 12, 2009
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    You will find a lot of time delay circuits you build out of just components have a slow on time, or at least I did....
    Why not use the 555? just curious?
     
  5. #12

    Expert

    Nov 30, 2010
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    I have some nice time delay circuits that can go several minutes (max) using a j-fet, capacitors, and resistors, but I have no idea what input signal you want to use or what output voltage or current you need.
     
  6. BillB3857

    AAC Fanatic!

    Feb 28, 2009
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    Back in the day, we would use a UJT and RC network.
     
  7. #12

    Expert

    Nov 30, 2010
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    oscillating the UJT to lengthen the time required to charge a cap?
     
  8. BillB3857

    AAC Fanatic!

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    UJT timer would trigger SCR
     
  9. #12

    Expert

    Nov 30, 2010
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    Oh. Using the UJT as a comparator (comparing the breakover voltage of the UJT to the voltage on a capacitor).

    Thank you Bill.
     
  10. BillB3857

    AAC Fanatic!

    Feb 28, 2009
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  11. #12

    Expert

    Nov 30, 2010
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    That's what I was thinking. Hope my words weren't confusing to you. Thanks again.
     
  12. CDRIVE

    AAC Fanatic!

    Jul 1, 2008
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    Here's a discrete alternative. Nearly any small NMOS FET will work OK. None of the component values are critical here.
     
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