Momentary switch to latched on/off toggle

Discussion in 'The Projects Forum' started by andyman, Jan 19, 2009.

  1. andyman

    Thread Starter New Member

    Jan 19, 2009
    7
    0
    Hi,

    I'm totally new to this forum and somewhat new to electronics. I'm looking for a circuit to convert a momentary switch to a toggled, latched, on/off switch.
     
  2. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    You can use a JK flip flop with its J and K inputs at logic 1. A JK with its inputs at logic 1 is also named as a T flip flop. With the JK in this arrangement the output Q will toggle between 0 and 1 (logic) each time you apply a clock pulse (press the momentary switch). Have a look here:

    http://www.play-hookey.com/digital/jk_nand_flip-flop.html

    Press on the blue inputs to make simulation.
     
  3. Wendy

    Moderator

    Mar 24, 2008
    20,765
    2,536
    AudioGuru has published a 2 transistor (3?) several times that looks fairly simple. If I can find it I'll attach the link.

    Found one (there were several)...

    [​IMG]

    This one was here.
     
    Last edited: Jan 19, 2009
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