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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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  • 0
    Looks like a comparator of the DC voltage gained from a mains supply compared to ref of Zener1 , having -ve feedback and the switching a load at a sensitity set by the output VR. 


    By NO you might mean Normally Open as per the relay or indeed ca circuit that holds itself off when energised.

    The propsed component actual values might help.


    Otherwise I`ll admit I`m lost.


    Could be an artificial chuckle separator
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  • 0
    Looks like a comparator of the DC voltage gained from a mains supply compared to ref of Zener1 , having -ve feedback and the switching a load at a sensitity set by the output VR. 


    By NO you might mean Normally Open as per the relay or indeed ca circuit that holds itself off when energised.

    The propsed component actual values might help.


    Otherwise I`ll admit I`m lost.


    Could be an artificial chuckle separator
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