What is the LED current in Fig. 32-27?

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Accepted Answer

When [latex]V_{GS}[/latex] is low, the LED is off. When [latex]V_{GS}[/latex] is high, the action is similar to that in the preceding example because the 2N7000 goes into hard saturation.

If we allow 2 V for the LED drop and assume [latex]V_{DS}[/latex] is zero,

[latex]I_D=\frac{20 V-2 V}{1 K\Omega }=18 mA[/latex]

Question 32.5: What is the LED current in Fig. 32-27?

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