claim: The Challenge: Rivals III is in opposition to The Challenge.
evidence: In electronics , switching frequency refers to the rate at which an electronic switch performs its function .. electronics. electronics. electronic switch. electronic switch. Switching frequency is an important design and operating parameter in systems such as  :. The Class-D amplifier , an audio power amplifier with a switched-mode output .. Class-D amplifier. Class-D amplifier. audio power amplifier. audio power amplifier. Various types of electric power conversion equipment  :. electric power conversion. electric power conversion. Boost converter. Boost converter. Boost converter. Buck -- boost converter. Buck converter. Buck converter. Buck converter. Chopper. Chopper. Chopper ( electronics ). Switched-mode power supply. Switched-mode power supply. Switched-mode power supply. Power inverter. Power inverter. Power inverter. Motor controls , such as Variable-frequency drives. Category  : Electronics