One method used to reduce the current drain of a digital circuit is with

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Complementary MOS (CMOS) technology is commonly used to reduce current drain in digital circuits. CMOS uses both n-type and p-type transistors in a complementary manner, so only one type of transistor conducts at a time, resulting in very low power consumption. Passive resistors and constant current sources are not effective for reducing current drain in digital circuits. JFETs may be used in some cases, but they are not as commonly used as CMOS.

One Method Used to Reduce the Current Drain of a Digital