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*Mathematical Algorithm*

VI = High (V2) to Low (V1)

- V
_{I}= V_{1} - i
_{B}= increases from I_{B1}toward zero - Emitter junction goes from zero bias to reverse bias
- During which i
_{B}= (0.7 - V_{1})/R or -V_{1}/R or I_{B1}==> 0 - i
_{B}(t) = I_{B1}exp(-t /RC) - C = Cje because only the Emitter junction is being changed.
- R = R
_{B} - i
_{C}= 0.