RE: Re: SOM1 relay board switching sound.

["Amar Nagi" <groups@xxxxxxx>]

ian can i have details of your board please


      -----Original Message----- 
      From: ian.bird@xxxxxxx
[mailto:ian.bird@xxxxxxx] 
      Sent: Fri 23/08/2002 13:31 
      To: ukha_d@xxxxxxx 
      Cc: 
      Subject: RE: [ukha_d] Re: SOM1 relay board
switching sound.
      
      
      When I was designing my relay board I
initially used reed relays which had some problems with things like
capacitive loads, AC etc. The relays on the SOM1 look very similar so you
may be experiencing similar problems. Check the relays are actually
switching off somehow with the speakers connected and showing the problems.
Alternatively use one of my boards <grin> which are rated up to 120v
AC and everything else you can think of.

      Ian 

      Ciba Vision (UK) Ltd 
      Tel:+44(0)1489 775570 
      Fax:+44(0)1489 779570 
      E mail: ian.bird@xxxxxxx 

            -----Original
Message-----
            From: Amar
Nagi [mailto:groups@xxxxxxx]
            Sent: 23
August 2002 13:26
            To:
ukha_d@xxxxxxx
            Subject: RE:
[ukha_d] Re: SOM1 relay board switching sound.
            
            
            i switched
both + and -
             
             

           
      -----Original Message----- 
           
      From: PatrickLidstone
[mailto:patrickl@xxxxxxx] 
           
      Sent: Fri 23/08/2002 13:18 
           
      To: ukha_d@xxxxxxx 
           
      Cc: 
           
      Subject: [ukha_d] Re: SOM1 relay board
switching sound.
           
      
           
      

           
      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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