D - Flip Flop Ring Counter (LED Flasher)

Hi here is new one topic related to Flasher circuit but this circuit is belongs to digital electronics theory. 

It today I am sharing D - Flip Flop based 4 bit ring Counter. Its very simple and easy to built and understand its working. 

Inputs of ring counter are

1. Clock Pulse

2. Preset

3. Reset 

Outputs are

A,B,C and D at which LEDs are Connected to show Logic.

Truth Table:

Clock   Preset   Reset       A   B   C   D

  1            1          0            0   0    0   0

0 - 1        0           1            1   0    0   0

0 - 1        1           1            0   1    0   0

0 - 1        1           1            0   0    1   0

0 - 1        1           1            0   0    0   1 

1st Case: at 1st clock:

2nd Case at 2nd Clock:

3rd Case at 3rd clock:

4th Case at 4th Clock:

above all slides are taken from Electronic Workbench simulation Software.

you can download Electronic Workbench Here