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# If the collector supply voltage is doubled, what happens to the load line?

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If $V_CC$ increases, both characteristic curve points $I_{C(sat)}$ and $V_{CE(cutoff)}$ are affected in the same manner (remember that $I_{C(sat)}=V_{CC}/R_C$ and $V_{CE(cutoff)}=V_{CC}$), hence the load line keeps the slope constant but the intersection points with the axis ($I_{C(sat)}$ and $V_{CE(cutoff)}$) increase their values. In this case, with $V_{CC}=10\ \mathrm{V}$, then:

\begin{align*} I_{C(sat)}&=\frac{V_{CC}}{R_C}\\ &=\frac{10}{470}\\ &=21.28\ \mathrm{mA} \end{align*}

and $V_{CE(cutoff)}=V_{CC}=10\ \mathrm{V}$, both parameters were doubled too.

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