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The input supply voltage is VAC 240 V(RMS) The rectifier diodes D1 to D4 have a forward voltdrop of 09V, while the zener diode DZ

The input supply voltage is VAC 240 V(RMS) The rectifier diodes D1 to D4 have a forward voltdrop of 09V, while the zener diode DZ has a reverse breakdown voltage of 12V, and draws a minimum current of 25mA when the power supply feeds the nominal load of RL 240

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