time delay

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

  1. ankur_s06

    Thread Starter New Member

    May 29, 2011
    1
    0
    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
    3,789
    945
    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
    1,425
    363
  4. CaptainPrice

    Active Member

    Aug 12, 2009
    49
    0
    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
    16,298
    6,808
    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

    Senior Member

    Feb 28, 2009
    2,400
    348
    Back in the day, we would use a UJT and RC network.
     
  7. #12

    Expert

    Nov 30, 2010
    16,298
    6,808
    oscillating the UJT to lengthen the time required to charge a cap?
     
  8. BillB3857

    Senior Member

    Feb 28, 2009
    2,400
    348
    UJT timer would trigger SCR
     
  9. #12

    Expert

    Nov 30, 2010
    16,298
    6,808
    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

    Senior Member

    Feb 28, 2009
    2,400
    348
  11. #12

    Expert

    Nov 30, 2010
    16,298
    6,808
    That's what I was thinking. Hope my words weren't confusing to you. Thanks again.
     
  12. CDRIVE

    Senior Member

    Jul 1, 2008
    2,223
    99
    Here's a discrete alternative. Nearly any small NMOS FET will work OK. None of the component values are critical here.
     
Loading...