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TINA/Spice/SN7400: Oscillator Simulation not working

Genius 11205 points
Part Number: SN7400
Other Parts Discussed in Thread: TINA-TI

Tool/software: TINA-TI or Spice Models

Hello Team,

I tried to simulate below circuit in TINA-TI without any success.

Transient Analysis just shows a straight line at 3.4V.

What is wrong, please?

Thanks and Best Regards,