Relay board - WAS - TTS and how to do it?

["i.bird@xxxxxxx" <Ian@xxxxxxx>]

Hmmm, they are 2 amp at 24 volts dc or .5 amp at 125v ac if I remember
correctly. The coils are available in 5, 12 or 24 volts. I will still be
fusing them at .5 amp but this can easily be changed. I will probably offer
the choice of relay coil voltage to anyone wanting them as this will save
having a regulator on board. Early days on that at the moment.

It is about two weeks work to redo and get to the test stage again. The
good news is that I have tested the new relays and they don't suffer with
the problems of the old ones. Just that bit bigger and stronger but with a
'standard' relay mechanism.

Ian B

Original Message:
-----------------
From: Frank Mc Alinden armagh@xxxxxxx
Date: Fri, 14 Jun 2002 21:59:35 +1000
To: ukha_d@xxxxxxx
Subject: Re: RE: [ukha_d] TTS and how to do it?


Sorry Ian
        Wasnt aware you changed your
relays. What
sort of switching current capacity do they have and any idea when the
board
will be available?

Frank Mc
----- Original Message -----
From: "i.bird@xxxxxxx" <Ian@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Friday, June 14, 2002 9:45 PM
Subject: RE: RE: [ukha_d] TTS and how to do it?


> Assuming you were running everything from a 'node 0' a relay board
would
be ideal as a solution. There are lots available not to mention the one I
am
working on at the moment. This would be a much neater solution that
relays
spread all over the house.
>
> And side tracking slightly (apologies)
> The web site is a little out of date at the moment and the new
relay
boards will have NO anc NC contacts as well as a common. This is because
I
am now going to use slightlydifferent relays from the original reed
ones.
>
> Ian B
>
>
> Original Message:
> -----------------
> From: Keith Doxey lists.diyha@xxxxxxx
> Date: Fri, 14 Jun 2002 12:25:31 +0100
> To: ukha_d@xxxxxxx
> Subject: RE: [ukha_d] TTS and how to do it?
>
>
> Not true....
>
> If all the speakers are 8 ohm you can use a relay to switht between
either
a
> speaker or an 8ohm resistor used as a dummy load.
>
> It keeps the impedance constant so volume doesnt change in each
room.
>
> Keith
>
> -----Original Message-----
> From: Mark Harrison [mailto:Mark.Harrison@xxxxxxx]
> Sent: 14 June 2002 12:09
> To: ukha_d@xxxxxxx
> Subject: RE: [ukha_d] TTS and how to do it?
>
>
> Well,
>
> If
>
> - the speakers are all the same
> - this is a powerful amp
> - it's signal mono
> - it's only for low-volume
>
> I'd wire them as 4 speakers per channel, with a line-level
stereo-mono
lead
> to give the same feed.
>
> They'd be two parallel chains, each of two speakers IN SERIES.
>
> The downside is, of course, that you have to run ALL speakers - you
can't
> zone it.
>
> Regards,
>
> Mark
>
>
>
> -----Original Message-----
> From: Frank Mc Alinden [mailto:armagh@xxxxxxx]
> Sent: 14 June 2002 11:58
> To: ukha_d@xxxxxxx
> Subject: Re: [ukha_d] TTS and how to do it?
>
>
> Hi Ian
>         I Agree simple is best
but how do you connect 8 speakers to 1
source
> without loading the amp?
> Frank Mc
>
>
>
>
>
>
>
>
> ----- Original Message -----
> From: "Kenneth Watt" <kennwatt@xxxxxxx>
> To: <ukha_d@xxxxxxx>
> Sent: Friday, June 14, 2002 8:48 PM
> Subject: RE: [ukha_d] TTS and how to do it?
>
>
> > I like the way you're thinking Ian, simple is best and less
likely to
> > fail!
> >
> > K.
> >
> > >
> > > Perhaps it's a design philosophy, but I really prefer the
"dumb node"
> > > approach wherever possible.
> > >
> > > Why have an amp + power + mute intelligence in each zone,
when you can
> > > have
> > > just a speaker, and a single wire run to it?
> > >
> > > I think the idea of using somehting like Ian B's irrigation
relay
> > board to
> > > switch on/off the zones seems like the best (for me
anyway!)
> > >
> > > perhaps you could use connect the relays such that when
closed, the
> > zone
> > > speaker is in circuit, wheras if it's open, an 4 or 8 ohm
power
> > resistor
> > > is
> > > in circuit instead?
> > >
> > > Ian.
> >
> >
> >
> >
> > For more information: http://www.automatedhome.co.uk
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>
>
>
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