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Simple Frequency Counter Circuit Diagram Using a Single IC 4033

The circuit shown below can be used for measuring frequency or Hz. The IC is very simple to make and utilizes just a single IC 4033 and a common cathode display as the main ingredients. If higher frequencies in the the order of two or three digits are required to be measured, then simple the number of modules can be connected in series as described.
The simple frequency counter circuit shown below will effectively convert any pulse at its input into a display over the 7- segment cathode block.

The IC has an internal BCd to 7 segment translator which directly converts the pulses at its input to readable numerical bars at the connected display block.

A single IC 4033 is able to handle only one common cathode display block and therefore the shown circuit is able to show numbers from 0 to 9 in response to the relevant clocks applied at its input.

The IC may be easily reset at any point. For example suppose 6 clocks were applied at the input and the the display now reads 6, it can be reverted to zero simply by pressing the shown push button, if needed.

Pin #1 is the input where the clock or the pulses are applied for counting.

In order to make the counter able to count to two digit or 3 digit or 4 digit etc. just include integrate the relevant number of modules as shown in the diagram and connect their outputs in the following manner:

Connect pin #5 of the first module to the clock input of the next module and connect pin #5 of the second module to clock input of the third module and so on.

Make the reset pins common, so that a single push button can be used for resetting all the modules at once.
Supply terminals will also need to be made into common rails.

A capacitor of 0.1uF should be connected close to the supply rail for decoupling purpose.

Simple Frequency Counter Circuit Diagram Using a Single IC 4033

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  1. Simply amazed. Keep posting, great work.

    Thanks & Regards


  2. What must be given to clock in ? to which pins does 9volts and reset goes ? the connection from 8 and ground goes to which pin of the common cathod display ??

  3. Dear Swagatam,

    I am confused to see the diagram. Please help me. As I know that PIN #1 is for clock IN and PIN #15 for Reset. But given circuit is totally against. I hope u will help me in this matter. Thanks

    1. Thanks for pointing out the mistake

      It seems to be a drawing error.

      Pin#1 is for clock IN.

      Pin#15 is the RESET input.

  4. Dear Swagatam sir ,
    can you please tell me how this circuit counts 50 hz supply with 'CLOCK IN'.

    1. Thanks! The above circuit needs corrections and modifications, because it's a simple 0 to 9 pulse counter and not a frequency counter.

  5. Sir, will a single ic 4033 work as a frequency meter to measure the frequency of any signals ( most probably a TTL one ) feding to it???? Does it need any reference 1 Hz signal for counting the exact no. of pulses in 1 second as in the case of 4026 IC?????

    If it doesn't need it, will you please suggest me a method in which 4 no.s of IC4033 can be cascaded to measure frequency upto 9999 Hz

    Is there any other ics exist which substitute ic 4033???

    1. Vinay, actually the IC 4033 is a pulse counter IC not a frequency counter, so I am afraid it cannot be used as a frequency meter.
      I checked your link, but me too could not identify the circuit details since it was too obscure to see them correctly.
      You can try making a IC 555 frequency meter and integrate it with s digital voltmeter to get the required readings.
      The 555 analogue frequency meter circuit can be found below:

      please note that you may have to use different value for C2 for different ranges of frequencies.


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