Latching Applications

Discussion in 'General Electronics Chat' started by demartinoj, Feb 15, 2009.

  1. demartinoj

    Thread Starter Member

    Jan 25, 2009
    10
    0
    I am trying to energize a circuit with some sort of latch component. My original thought was to use a mechanical latching relay. After some thought I have decided I would like to use a solid state device for the latch instead. I was considering using a JK flip flop and toggle the Q and Q not with the set and reset. I am not sure that this is a proper application for the JK flip flop. Does anyone have any suggestions on other solid state devices that could be used for latching similar to a latching relay or have an opinion on the use of the JK flip flop for this application? All my circuit logic is 5Vdc.
     
  2. masa6614

    Active Member

    Nov 9, 2008
    49
    0
    albertos circuit is good, or you can try these as well,

    one of these guys ( http://www.allaboutcircuits.com/vol_3/chpt_2/11.html ) or transistors to accomplish it like they had in the daigram, cus Vcc is 5V make sure to use logic level fets, and there will be a bit of a voltage drop across top pchannel to the load.

    Or you can use a j/k like you wanted, ( http://www.fairchildsemi.com/ds/74/74VHC112.pdf ) looking at the truth table, it dont matter what J, K, Q', or the clk is, if you just ground the Clr, and toggle the PR, Q will change which you set up to energize on/off the circuit you wanted
     
    Last edited: Feb 15, 2009
  3. demartinoj

    Thread Starter Member

    Jan 25, 2009
    10
    0
    Thanks Alberto and massa6614!

    I will use one of these solutions.
     
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