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    Simple way to reduce RPM on this fan?

    Fan runs constantly, even when the air exhausting the exit is cool. I opened the case hoping to find everything deeply clogged with dust but there was very little, certainly not enough to be causing such an issue.  Noisy fan is a common complaint on this model hp110mini.   From what I...
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    AC/DC Hall effect detection circuit??

    I would like to set up a simple experiment for a Hall effect or MR chip. A relay energizes a 115vac light bulb whenever 5 amps of AC or DC current is flowing through a 16ga stranded copper wire.  I cannot loop the wire.  I cannot separate the wire at either end.  I am not a student (this...
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