For simplicity, an animation output of electronic counter sequence is also provided with this article. After reading this article you will be able design Up Counter circuits easily.
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Digital Logic Counter Circuit Schematics
Components Required For Counter Circuit Design
- Power supply
- 7473 JK flip flop IC x 2
- Resistors (1kΩ x 4)
- LEDs x 4
- 1Hz clock of 1Hz Astable multivibrator
Working Digital Logic Counter
- In this digital counter circuit set up, all flip flops are clocked by the Q outputs of previous flip flops. Thus it is called as an asynchronous counter.
- All the JK flip flops holds their J and K inputs at logic ‘1’. 7473 IC is a dual JK master slave flips flop with a clear pin.
- A ripple counter comprising of N flip flops can be used to count up to 2N pulses. That is, a circuit with 4 flip flops gives a maximum count 24=16.
- This counter gives a natural binary count from 0 to 15 and resets to initial condition on the 16th input pulse.
- Since J and K inputs of all the flip flops are connected to logic ‘1’, they act as a toggle flip flop.
- Here the output of each flip flop toggles at the negative transition of clock input.
- With the application of 1st clock pulse, Q0 changes from 0 to 1, whereas Q1, Q2 and Q2 remains unaffected.
- On 2nd clock pulse Q0 becomes 0 and Q1 becomes 1. This process occurs for other flip flops also.
- If we are taking output from Q’, we will get a down counter simultaneously.
- You can use an astable multivibrator circuit for generating clock pulses.
Counter Circuit Design Truth Table
0 to 15 binary counting sequence of Up Counter is shown below
Output wave form of Up Counter
Status of each output in the counter is plotted on CRO Screen as
Binary Up Counter Circuit Working Animation
Digital Counter Design Circuit Assembling And Working Simulation Video
Watch this video of Binary Up Counter circuit simulation. In this video we have showed the step by step circuit assembly and output working of Digital 4 bit up counter circuit. You can also visit out Video Gallery for other videos.
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