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UTPUT. ? DETECTOR GIVES SIGNAL TO PORT3 OF MC. ? IT PERFORM 4 ACTIONS. POWER SUPPLY Power supply types ? Linear power supply. simple design that bees increasingly bulky and heavy for high current devices . ? switching power supply. It is usually more efficient, but will be more plex. LINEAR POWER SUPPLY ? TRANSFORMER ? RECTIFIER ? CAPACITORS ? LED ? RPS AT89S52 MC ? Architecture – 8051 based ? 8bit Microcon