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Center-tapped transformer takes AC from source, steps it down while also creating a paraphrased signal. Full wave rectifier (blue & green) creates positive pulsating DC. Next, the filter (orange) will eliminate the pulsating DC by a charging up to a ripple, and finally our regulator (red), using our zener diode, will steady out the ripple to a nice steady DC. When power switch is turned off, relay is toggled, offering filter a safe path to discharge instead of continuing to light lamp (our load).
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