Re: SOM1 relay board switching sound.

["PatrickLidstone" <patrickl@xxxxxxx>]

Loudspeakers use an AC signal, not DC. There is no concept of a 
common ground, so you can't switch it that way. 

Patrick


--- In ukha_d@y..., "Amar Nagi" <groups@a...> wrote:
> i think you need to switch the live
>  
> 
>       -----Original Message----- 
>       From: justin@g... [mailto:justin@g...]
>       Sent: Fri 23/08/2002 13:06 
>       To: ukha_d 
>       Cc: 
>       Subject: [ukha_d] SOM1 relay board
switching sound.
>       
>       
> 
>       I recently purchased a SOM1 relay
board
>       (http://www.phaedrusltd.co.uk/system/index.html)
>       I am running 2 sets of speakers
connected to a soundcard over 
CAT5 and thought
>       I would try switching using the relay
board (that's not why I 
bought it though)
>       
>       The wiring uses 4 cores, orange = left,
green = right, w/o & 
w/g = ground*.
>       When I switch the ground it just goes a
bit quieter? Any 
ideas why this
>       happens? I thought it would just switch
the sound off!
>       
>       Cheers,
>       Justin.
>       
>       * I think it probably isn't a great
idea to use 2 cores for 
ground & 1 each for
>       left/right, but don't know why! I was
thinking about 
shielding.
>       
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