RE: Re: SOM1 relay board switching sound.

[ian.bird@xxxxxxx]

Title: [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@xxxxxxxSubject: 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@xxxxxxx...]
>       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.
>      
>