RE: Re: TTS and how to do it?

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

You're out of date as of last night Frank. Super dooper new relays have NO
and NC as well as common contacts. They will also be able to supply power
e.g. for water valves although not necessary in this case. This function
will probably be jumper selectable by relay so mix and match.

Ian B

Original Message:
-----------------
From: Frank Mc Alinden armagh@xxxxxxx
Date: Fri, 14 Jun 2002 21:27:55 +1000
To: ukha_d@xxxxxxx
Subject: Re: [ukha_d] TTS and how to do it?


Thats Correct Ian
I would assume the resistors would have to be the same wattage as
speakers.
I wonder what effect would have switching speakers in /out (the
transition
point ) have on the amp. Maybe mute output when momentarily when
selecting
/deselecting? zones .Ians relay board
does not have dry changeover contacts to switch between resistor and
speaker
although would be good to use to isolate from hv or pc.

Frank Mc
----- Original Message -----
From: "Ian Lowe" <ian@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Friday, June 14, 2002 9:15 PM
Subject: RE: [ukha_d] TTS and how to do it?


> As I understand it...
>
> AMP+---(8OHM)---AMP-
>
> is *EXACTLY* equivelant in impedance terms to:
>
> AMP+-(--(8OHM)---(8OHM)--)-AMP-
>      (--(8OHM)---(8OHM)--)
>
> (as the serial speakers have an effective impedace of 16 ohms, but
adding
> these pairs in parallel brings the effective impedance back down to
8
ohms)
>
> the difference, of course, is that you have higher power losses
through
the
> four speaker matrix, but this is TTS: mega volume is not the order of
the
> day anyway..
>
> Ian.
>
>
> -----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
> > Post message: ukha_d@xxxxxxx
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> >
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http://docs.yahoo.com/info/terms/
> >
> >
> >
>
>
>
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