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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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    What has been bugging me, is why have they connected pin 7 of the op-amp the the un-regulated side of the power supply and not to the regulated side. although for that matter did the relay driver circuity need a regulated supply?  

    Clive
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    What has been bugging me, is why have they connected pin 7 of the op-amp the the un-regulated side of the power supply and not to the regulated side. although for that matter did the relay driver circuity need a regulated supply?  

    Clive
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