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In the figure of transistor as a switch,...

In the figure of transistor as a switch, the `V_(BB)` supply can be varied from 0V to 5V. The Si transistor has `beta_(dc)=250` and `R_(B)=100 kOmega,R_(C)=1 kOmega,V_(C C)=5V`. Assume that when the transistor is saturated, `V_(CE)=0V` and `V_(BE)=0.8V` . calculate
(a) the minimum base current for which the transistor will reach saturation. hence.
(b) Determine `V_(i)` when the transistor is switched on
(C) Find the ranges of `V_(i)` for which the transistor is switched off and switched on'

Text Solution

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(a) `20 muA`
(b) `2.8 V`
(c) Switched Off between 0 V and 0.6 V
Switched on between `2.8 V` and `5 V`
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