Toggle on of with timer555 and relay 2 different voltages with relay HELP

Discussion in 'Homework Help' started by rastaman46, Nov 18, 2011.

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  1. rastaman46

    Thread Starter Active Member

    Nov 17, 2011
    Timer 555 and relay circuit with 2 different powers

    Hello im got circuit made of that image all works fine

    im using two power feeds

    one is 5V
    Other is 12V

    both can be run on same GND


    but i want insert spdt relay in it to be able to turn 12v ground to relay so i get 12v of relay to my motor

    ne555 is on 5v

    i try but bad luck

    once im switch power on its pover coil up all ok but im cant tur in off by pressing same momentary button i need disable graund manually to set relay to N-O position when relay on im got N-C

    can any one help please
  2. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    You've started this same thread in two places here in Homework and in Projects - which causes confusion. I've replied to your thread in Projects. Is this really homework?
  3. Wendy


    Mar 24, 2008
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