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anyone know about component function like this or similar??

Discussion in 'Electronic Basics' started by bene-tam, May 14, 2004.

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  1. bene-tam

    bene-tam Guest

    Basically, what i want is some kind of "latching device".

    Assumed it has 4 pins.

    When a pulse is feed with Pin1 is 5V, Pin2 is 0V, Pin 3 and 4 becomes
    internally connected.
    When a pulse is feed with Pin1 is 0V, Pin2 is 5V, Pin 3 and 4 becomes
    internally disconnected.

    For most of the time, Pin1 and Pin2 are 0V.

    Thanks so much

    Bene Tam
  2. I don't understand your "pulse is fed with" terminology. Are you
    saying that pin 1 and pin 2 have independent states or is one
    dependent on the other? If they are independent, then there are 4
    possibilities, and you have described only 3. Can the signal applied
    to pin 1 and 2 be both high at the same time? If so, what does this
    do to the connection between pins 3 and 4?

    I also see nothing involving a latch in your description. You appear
    to be talking about something more like a relay or transmission gate.

    Take a look at the data sheet for a common transmission gate and then
    help me understand if it relates at all to what you are looking for.
  3. Soeren

    Soeren Guest

    (bene-tam) wrote in
    Sounds like a latching relay (or its electronic equivalent) to me -
    first pulse closes the switch, second pulse opens the switch, third
    pulse closes the switch again etc.

    It could be made with a bistable multivibrator and a relay (or the 4066
    JP mentions instead of the relay).
  4. Rich Grise

    Rich Grise Guest

    I see a black box with an RS flipflop, whose Q output turns on some
    kind of switch between pins 3 & 4. The R and S inputs are active high.

    Hey, I got one over on John Popelish?

    O Frabjous Day! Callooh! Callay! <chortle>

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