i need an analog monostable mutlivibrator

Discussion in 'The Projects Forum' started by leonheard, Mar 11, 2013.

  1. leonheard

    Thread Starter Member

    Jan 8, 2013
    48
    0
    hi! i need a schematic of a monostable multivibrator, and use it like a timer,
    example when i trigger it i want to turn my led on for 10 sec then turn off ( thats a monostable isnt it? )

    i made some research and i found this link, i tried it but no luck didn't work,

    http://www.ecelab.com/circuit-monostable.jpg


    if u could give me a working schematics ( analog, i dont want to use ic555)
    thanks! ;)







    i already made a analog stable multivibrator to control my dc motor and it works fine with pwm....
     
  2. Bernard

    AAC Fanatic!

    Aug 7, 2008
    4,172
    397
    Ckt looks OK to me, but here are some oldes, all tried. Seems that there are some missing values, first 2N3904 collector- 2.2k, Rx approx. parallel combo of 1m & 2m.
     
    Last edited: Mar 11, 2013
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  3. Bernard

    AAC Fanatic!

    Aug 7, 2008
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    The other one, all reported as tried.
     
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  4. leonheard

    Thread Starter Member

    Jan 8, 2013
    48
    0
    okei! thank you so much! i did one of your schematic and i think it works :D ( cuz when i touch with my finger "the trigger" then the led turns on for 10 sec then turns off )


    now i want to trigger the astable multivibrator with this :p
     
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