Re: Wanted - auto sensing speaker switch

[Kevin Hawkins <lists@xxxxxxxxxxxxxxxxx>]

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
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