Push button 4027

Discussion in 'General Electronics Chat' started by newbielectronics, Aug 29, 2006.

  1. newbielectronics

    Thread Starter New Member

    Aug 29, 2006
    1
    0
    Hi,
    I am new to electronics and I was wondering if you could tell me how to use a 4027 JK flip flop to create a simple on off toggle switch with a push button. I was also wondering how you know which pins to wire and what each pins function is. I know there is a datasheet but I still don't know what Q and related mean how to use them and what value of capacitors and resistors I need around the circuit. How do you figure all this out?
    Thanks.
     
  2. pebe

    AAC Fanatic!

    Oct 11, 2004
    628
    3
    This link may help you understand the JK flip flop.

    http://www.allaboutcircuits.com/vol_4/chpt_10/6.html/j_k_flip_flops
     
  3. lightingman

    Senior Member

    Apr 19, 2007
    374
    22
    Does it have to be a 4027 ?

    It is very easy to do it with a 4013.

    Input to clock (with pull down resistor of about 10K), tie data input to inverted Q output, tie reset and set to logic "0".

    Now if you are using a switch, you should be aware of switch bounce problems I.E. the noise caused by the switch contacts when they come together or move apart.

    There are a few ways of overcoming this, but try this one:-

    Connect one end of the switch to VCC, the other end to a resistor (10K) to GND.
    From the junction of the switch and resistor connect a capacitor with the other end of the capacitor (10nF) through another 10K resistor to ground.
    At the junction of the capacitor and resistor, connect a diode "anode" (1N4148, 1N916), and then the cathode to the clock and pull-down resistor on the 4013.

    If the switch is very bad, it may help if you put a small capacitor accross it (about 470nF)

    Daniel.
     
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