AVR-Chat

I think you are right, even with no power on contactors (just relays 
are on) the same problem occures time to time. 

May you send me a schematic (or web link) on using optocouplers 
along with TRIACs on AVR output pins? Am amazed with this optocoupler 
part. Seems interesting, and maybe a final solution?!

--- In AVR-Chat@yahoogroups.com, "Enki" <enkitec@...> wrote:
>
> On 8 Jan 2008 at 6:25, Roy E. Burrage wrote:
> 
> > 6.  Have you thought about your 5 volt relay contacts?  It might 
be a 
> > good idea to put RC snubbers across these too.
> 
> 
> 	I'd use TRIACs with optocouplers here.
> 	Snubbers across the TRIACs, of course.
> 	Relay coils on the +5V line is not a good practice.
> 
> 	BTW, are you sure the sparks are the culprit?
> 
> 	Mark Jordan
>