Astable flip-flop multivibrator circuit

The two parts` component parameters and models of the circuit are corresponding to simultaneously obtain a rectangular wave with duty ratio of 1:1, its frequency f = 0.7/RB ¢ C. RB is Rb1 or Rb2 in the figure, and its upper limit value Rb1 < 0.5?RC1 ; Rb2 < 0.5?RC2, here ? is the transistor collector current amplification factor. The lower lim..

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