Re: Relay question

["Justin" <justin@xxxxxxx>]

Thanks for that James.

Apparently the coil is 12V so I guess that means  I need to wire the +- to
a
wall wart?
The blurb says "Mains voltage SPDT relay rated 10A" so I guess
(hope) it's
ok.

Justin.

----- Original Message -----
From: James Hoye <james.hoye@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Friday, November 09, 2001 4:18 PM
Subject: RE: [ukha_d] Relay question


> > Would someone who knows about relays be kind enough to have a
look at
this
> > http://www.electronic-kits-and-projects.com/images/3xxx/3044_pcb.jpg
and
> > tell me what goes where If say I wanted to wire a light that
would come
on
> > when >1V DC is applied.
> > I have ordered an assembled version but having looked at the
documentation
> > haven't got a clue how to wire it up!
>
> You CANNOT use this circuit to control MAINS, mainly because I don't
think
> there is suitable isolation, and that the PCB probably isn't rated for
it.
>
> Assuming it were up to the job, your load (light) would be connected
across
> C (COMMON) and EITHER NO NORMALLY OPEN) OR NC (NORMALLY CLOSED).  NO
would
> mean you'd have to apply a SIGNAL to turn the light ON, and
conversely, NC
> would mean you would have to apply a SIGNAL to turn the light OFF.
>
> NO is my guess at what would best fit your application.
>
> Your low voltage switching signal would be applied across SIGNAL +/-
>
> I think the + and - probably need 12v dc to supply the power to
energise
the
> relay (1v isn't enough on its own for 99% of relay coils).
>
> That's as I understand it from the PCB.  Hopefully Keith and others
can
> confirm what I have said (otherwise I have embarrassed myself!)
>
> James H
>
>
> For more information: http://www.automatedhome.co.uk
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