Timed 12v pulse

Discussion in 'The Projects Forum' started by Jpaytoncfd, Mar 11, 2009.

  1. Jpaytoncfd

    Thread Starter Member

    Mar 11, 2009
    10
    0
    Hi im not new to electronics but im not that knolagable

    I am using a dual Coil latching relay to turn an ignition on and off. Using a rfid to turn on and a pulse from another device to turn it off. I also want it to turn off after like 15-30 mins. Someone sugested a compacitor but if I understand correctly that will charge up to a much higher voltage and release it at one which would overload the relay coil. The simpler the better someone also said I would have to use a microcontroler. I am considering haveing the relays mounted on a pcb board and would like to add the timer feature built it rather than trying to add it on later. My though was a compacitor and something that would only allow the 12v 100mA through and ground the rest. (to empty the compacitor)
     
  2. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
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    When you type "compacitor," do you mean "comparator" or "capacitor?"
     
  3. Jpaytoncfd

    Thread Starter Member

    Mar 11, 2009
    10
    0
    capacitor, sorry my spelling is horrable. ya after a period of 15 mins I need a 1-2 second pulse.
     
  4. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
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