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An astable multivibrator using the IC 555 can be designed to generate a continuous square wave of 20 kHz by configuring the timer in its free-running mode. In this configuration, the IC alternately charges and discharges an external capacitor through two resistors, producing a rectangular waveform at the output pin (pin 3). The essential components required are two resistors (R_A) and (R_B), and a timing capacitor (C), connected ______ _______ ___ ________ __________ _____ __________ ____ ___.
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