Re: TI-H: Electronics junk
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Re: TI-H: Electronics junk
solid-state relays
joe
Muhammed J. Galadima wrote:
> >A relay is basically an electrically operated mechanical switch. It
> >consists of two or more metal contacts and an electromagnet that, when
> >powered, will pull the metal contacts together and activate the
> >circuit. Its a fairly good way to get safe and relatively
> >uncompromisable electrical seperation between one circuit and another,
> >although I'd probably use an optoisolator and/or MOSFET depending
> >on the application; since relays have moving parts they can fail.
> >
> >There is no real '- volts' Current does not flow in 'different'
> >directions:
> >as the name suggests, e-'s flow in a circuitious path from positive to
> >negative (unless I have it backwards, and I probably do). Thus the
> >negative side of the battery can be considered an electron return, or a
>
> yup, u got it backwards, electrons go from neg to pos...
> aren't there non-mechanical relays too? i'm not surebut I thought there
> were...
>
> >ground. A power ground for all intensive purposes is the negative side
> >of
> >a battery, but in RF circuits you may see an Earth ground (in which you
> >literally connect that portion of the circuit to a copper rod in the
> >Earth)
> >and, every now and then, you'll see various other types of grounds. But
> >in
> >battery circuits its usually necessary to connect the negative battery
> >terminal
> >to the ground return.
>
> exactly... I was reading somewhere (I might have forgotten a bit so
> correct me if I'm wrog) the ground is a reference voltage, in between
> the pos. and neg., so say you had 2 batteries connected in series the
> pos. terminal would be +V, the neg terminal -V, and in between the 2
> batteries would be the ground.
>
> >
> >Any of the real EEs on the list with a more theoretical explanation can
> >feel free to jump in, I'm not very familiar with all of the theoretical
> >aspects
> >of electrical engineering.
> >
> >Bryan
> >
> >Larry G Currie wrote:
> >>
> >> I was looking at some schematics and have 2 questions:
> >> 1. How does a relay work? I know it's some kind of switch but thats
> all
> >> 2: IN these schematics, it shows where +12V goes into the system but
> >> doesn't show where -volts goes. Should it go where the schematics
> show
> >> ground (I think it's ground, It's a inverted pyramid made with
> horizontal
> >> lines or a tornado) eg.
> >> --------
> >> ------
> >> ----
> >> --
> >>
> >> Larry1492@juno.com
> >>
> >> _____________________________________________________________________
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> >--
> >Bryan Rittmeyer
> >mailto:bryanr@flash.net
> >http://www.bridges.edu/horizon/
> >
>
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