Ex. Using Nyquist to determine range of K for Stability

Take an open loop transfer function, and add series gain K and unity feedback. Use Nyquist to determine the range of K (any real number, including less than 0) for which the closed loop system will be stable.

[@erickmagalhaes1244]

Thank you

[@rohityadav-iq5hm]

can you make 0 and phi different next time

[@nirornkong416]

Excuse me!why the the value of angel of Real equal to 180 and angel of Im equal to -90

[@user-dz7ix5go9d]

If you know the answer tell me please!

[@jakobsime4190]

Almost clear... almost...

[@3biltala]

awesome,thanks alot

What happens if K=1? Can we encircle -1 point ?

[@berkbural]

how did he come up with -1/K = -1 at 6:27

[@aliawied2713]

The Polar Unit Circle, Where it is stable if the plot is with -1 circle (half circle in the case of the video), But since you can't encircle -1 you choose (1/40)and(1/567) that we had.
That's what i understood.

[@geethamadhurivasa5779]

Speak clearly I can't understand