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With reference to the LED driver of Example 10.4, Figure 10.14 in the text, assume that we need to drive an LED that requires ILED = 10 mA. All other values are unchanged. Find the range of collector resistance RC values that will permit the transistor to supply the required current.
10.20 Use the same data given in Problem 10.19, but assume that RB = 10 kQ. Find the minimum value of β that will ensure correct operation of the LED driver.
10.21 Repeat Problem 10.20 for the case of a microprocessor operating on a 3.3-V supply (that is, Von = 3.3 V).
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