latching ckt design.

Discussion in 'The Projects Forum' started by Dan Asbjornsen, May 3, 2015.

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  1. Dan Asbjornsen

    Thread Starter New Member

    May 3, 2015
    Hello from Dan KB7UXE..
    I have a control ckt that works well using two relays.
    I would like to eliminate the relays and change over to transistors.
    I have a 12 V source , < 1amp , I need to sink to ground.
    I would like to latch it to ground with a momentary ground.
    Then release it with a momentary 12V signal .
    Due to the sources, the control parameters are set.
    ckt needs to be connect with gnd,, and open with 12V.
    any help is really appreciated.
    Thank you.
    Dan. kb7uxe. . .

    here is a drawing. any suggestions on what to use or better way to do it ? ???

    switch ckt.jpg

  2. MrChips


    Oct 2, 2009
    The owners of All About Circuits have elected not to allow discussions of automotive electrical system modifications/enhancements due to safety concerns, the potential of legal ramifications and the possible circumvention of vehicle regulations at the state and federal level.

    This thread is against the AAC forum rules, Chapter 6, as seen here:
    This can be found in our Terms of Service (ToS)

    Here is a site that may provide you with some assistance: Electro Tech Online

    Good luck.
    Dan Asbjornsen likes this.
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