Square wave generator with 7400 series chip

This is a simple and useful oscillator, built, using  just a 7400 chip ( 4 NAND gates ) and very few other components.

7400-square-wave
7400-square-wave-pcb
square-wave-signal

Comments

  1. written by: umang shah on March 20, 2016 at 7:52 am - Reply

    We are trying to generate a square wave form using 7400 IC for one component of out project can you please share the formula for timeperiod so that we can manipulate….

    • written by: Mihai on March 22, 2016 at 1:17 am - Reply

      Hi,
      The frequency of an astable multivibrator is f = 1/[ln(2)*(R1C1+R2C2)] and in practice is often approximated to f ≈ 0.7/RC.

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