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Retriggerable monostable multivibrator quickly discharges power-supply capacitor 1/5/2008

Universal power supplies must work from mains power lines ranging from 90 to 264V ac at 50 or 60 Hz. Directly rectifying the input voltage charges the filter capacitor to between 120 and 370V dc. Such voltages present a serious threat to personnel prototyping or repairing the power supply. It is desirable ...

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