Fw: Wanted - auto sensing speaker switch

[Gareth Cook <g@xxxxxxxxxx>]

0 - 5v for Comfort inputs. 3.3v for Comfort 2 I think.

I've got my XBOX working now via Comfort - uses the power button via the
relay to togle the power, but I have the 3.3v circuit now plumbed into an
input. If the XBOX is on, I get a signal that Comfort can read - and
therefore knows it's current state.

Means I can tell the Amp to go explicitly on or off or just go back to the
TV (which is also controlled via rs232 via comfort)

Works a treat :-) Just want to do this with Sonos....I might have to rip a
zoneplayer open and get the multimeter out.

G.

Gareth Cook
IT Architect / Project Manager, SWG Sales
Office: +44 (0)1784 445166 - Mobile: +44 (0)7980 445166
email: g@xxxxxxx


----- Forwarded by Gareth Cook/UK/IBM on 07/04/2007 16:25 -----

Discussion
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ukha_d@xxxxxxx
Today 14:48

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Subject:
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Re: [ukha_d] Wanted - auto sensing speaker switch
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Category:



The Russound Auto A/B switch although it has no output connection it has
an LED on it to indicate when speaker level input B is active - you
might be able to get enough volts from this by a couple of wires to
trigger a Comfort input and the switch function might have a use.  Only
for speaker level signals though.

Alternatively you could attach a diode /resistor to an electrolytic
capacitor that would 'charge' as the music played . The voltage across
the capacitor would be the zone input to Comfort. What voltage does
Comfort need to see a change in state on an input ?  Again this would be
much better from a speaker level output but may even work from a line
level depending on volume.  You need to ensure at speaker level the
voltage across the capacitor can't exceed the max input allowable to
Comfort with say a Zener diode across the capacitor. Or maybe Comforts
inputs are normally 'pull down' ie 0V/short is the activation ?  This
might marginally impact your sound quality too, particularly if it was
workable at line level. .

A better solution  would be a  fancier active circuit that had higher
input impedance and an open collector or opto / relay output. Sure
somebody will make such a thing .. just finding it (or building it).


K

Gareth Cook wrote:
> On my continuing quest to try to automate this bleeding Sonos
ZonePlayer,
> Im thinking one way is to sense when audio is being pumped out of the
> analog ports and then use that as the trigger to automate the amp,
etc.
>
> Had a quick google but not a lot has come up (apart from SCART
switchers)
> - Anyone seen a simple audio switcher ? As long as it either sends out
a

> voltage or hits a relay of sorts internally, I can use that as a
trigger

> into Comfort.
>
> ??
>
> tia
>
> G.
>
>  Gareth Cook
>  IT Architect / Project Manager, SWG Sales
>  Office: +44 (0)1784 445166 - Mobile: +44 (0)7980 445166
>  email: g@xxxxxxx
>
>
>
>
>
>
>
> Unless stated otherwise above:
> IBM United Kingdom Limited - Registered in England and Wales with
number

> 741598.
> Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6
3AU
>
>
>
>
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> [Non-text portions of this message have been removed]
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Unless stated otherwise above:
IBM United Kingdom Limited - Registered in England and Wales with number
741598.
Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU







[Non-text portions of this message have been removed]