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Power-on delay

Power-on delay
The power supply for this analogue circuit that affords delays of 330 seconds is taken directly from the mains. The direct voltage at the output of the bndge rectifier is held at 22 V by zener diode D5-Resistor R6, which enables C, to discharge rapidly as soon as the mains is switched off must be rated at 250 V a.c. or 400 V d.c.
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