frascati

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. [img width=680 height=510] From what I understand thusfar the red is 5v pos, the black is ground, the yellow is RPM signal return to the motherboard. I've checked and there appears to be no way to regulate the voltage/speed via GUI. I have read a few webpage prescribing as simple as a series resistor ranging from 10 to 300 ohm (depending upon who's math you have faith in) as well as applying a three pin IC voltage regulator (which sounds ideal, but there are thousands to choose from). I'd like to drop the rpm (unknown) almost 50 percent. Any suggestions?

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 is not an assignment), nor an engineer (obviously). There are hundreds of hall effect devices out there at dozens of distributors. There has got to be something that will simply do what I've described above. Any suggestions please? Thanks so much.