LCD-LED Display

JK Flip Flop using CD4027

CD4027 is a JK flip flop that is commonly used to store data. The IC contains two JK flip flops that are similar or equal. Each pair of JK flip flops with IC includes pins J, K, set, reset, clock, and two output terminals that are complementary to one another. The JK flip flop can be used in applications such as voice registers, counters, and control circuits.

JK Flip Flop with CD4027 Circuit Diagram:

JK Flip Flop using CD4027

Circuit Components:

  • IC
  • CD4027
  • Resistor
  • R1(1K)
  • R2(470E)
  • R3(10K)
  • C1(2.2uf)
  • S1
  • LED
  • D1(1N4148)

JK Flip Flop with CD4027 Circuit Description:

CD4027 is a master slave JK flip flop that is used in toggle mode. By providing control input from one or more input terminals and receiving output at one or more output terminals, an IC is used to change the signal. The value of output is determined not only by the current state of the input, but also by the current state of the output (also depend on the earlier state). Flip flops were commonly employed in computer memory circuits.

In a JK flip flop, there are four input pins: J and K, set and reset pins, and Q and Q for output. The value of Q and Q are diametrically opposed, i.e., if the value of Q is greater, the value of Q is lower, and the output at both terminals is determined by how the input is arranged. The IC pin configuration is depicted in the diagram below.

The stage of the flip flop is controlled by the logic level present at the input terminals J and K, as well as internal control. Every time a good cycle continues, the state changes. The set and reset pins are not affected by the clock pulse, and they are activated when a high signal is applied to any of the input terminals.

The described circuit is activated on the leading rim of the switch pulse, that is, when the switch is pressed and the output changes. As seen in the circuit, both input terminals J and K are set to a high value, implying that the clock pulse will oscillate between high and low at each positive or negative transition. This condition of the flip flop is known as the forbidden state, and these conditions can be proved using the truth table below.

As soon as you hit the switch, a brief clock pulse is sent to the IC’s input, causing pin 1 output to become high. The output will remain high until the second pulse is received. The output is activated when a load or a led is connected to it. When the second clock pulse reaches pin 3, the IC output goes low, and the LED or load connected to it turns off.

This circuit works by pressing the switch, but all you have to do to break the circuit is swap the switch and resistor positions.


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