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What Part of ______________________ Don't You Understand ? - One for mapj1 ?

AncientMariner
I came across this mug recently, looked at the circuit diagram and started to wonder whether I understood it? Or perhaps more to the point, did the draughtsman/women/person understand the design?

https://www.amazon.co.uk/ENGINEERING-UNDERSTAND-Novelty-Printed-Ceramic/dp/B01IC23TSC


Clive
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    The relay coil will be rated for a specific DC operating voltage which probably explains the use of the regulator. We do not know what the unregulated voltage range is from the diagram and it could vary considerably even with transforming of the mains AC down to a lower voltage.
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    The relay coil will be rated for a specific DC operating voltage which probably explains the use of the regulator. We do not know what the unregulated voltage range is from the diagram and it could vary considerably even with transforming of the mains AC down to a lower voltage.
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