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Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

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RE: As the circuit is drawn and assuming the 9V supply...

Posted by Davey on October 19, 2020 at 07:22:25:
I think the assumption is the 9 volt battery does not have zero internal resistance. There really should be a resistor between it and the rest of the circuit.
The whole thing is a joke and "designed" by somebody who had no clue what they were doing.

Dave.