Given the circuit of Figure P10.8, find the minimum value of RC such that transistor operates in active mode and dissipates less than 15 mW. Let VCC = 10 V, R1 = R2 = 40 k?, RE = 1.5 k?, VBE = 0.7 V, ? = 70, and VCEsat = 0.25 V.



Known quantities:

For the circuit shown in Figure 10.24 in the text:



Find:

The minimum value of RC such that the transistor operates in the active region and it dissipates less than 15mW.


Analysis:

The dissipated power depends on base and collector circuits. We can see the circuit as in the following figure:

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