This is a circuit which automatically turns On the lights when a person enters the washroom and it automatically turns it Off when he leaves it. This is a circuit which automatically turns On the ...

This mini-series of articles describes how to build a computer’s CPU (central processing unit) out of relays. “Y” in English sounds like “guay” in Spanish (my mother tongue), a colloquial expression ...

Relays are electromechanical devices that use a magnetic solenoid to actual a switch. When current is passed through the solenoid coil, it produces a magnetic field. The magnetic field is strengthened ...

I know pretty much how smaller switches work but my question mainly has to do with how switches work in a campus environment. <P>At my university the network services people told me that they use a ...