Dennis Plunkett wrote:
>
> At 12:05 5/11/99 +1100, you wrote:
> >"William J. Kitchen" wrote:
> >
> >> With a big battery, it might smoke or even catch fire.  The more current
> that's available,
> >> the more you might want to use a fuse.
> >
> >I tell people who build my ignition controller to keep high current
> >ground returns seperate from the one that powers the PCB. I have seen
> >most of the PCB tracks vaporised in a fault condition. It's still got be
> >beat how they did it though.
>
> Something is confusing me here Tony
> I thought that you have had no probelms with the 7805 approch nad over 1000
> units
> Now you seem to indicate unexplainable faults.
>
> HUMM
> Maybe there is something in that for all of us... <GRIN>
>
> As for the question of what is a TRISIL. Basicaly is a bidirectional
> crowbar device (Like 2 SCRS) that clamps both rails together (To within
> 0.6V) one the breakover point is reached. These things come in 0.5kW and
> 1.5kW (Yep thats correct) versions (surface mount 0805, and SOIC8!). I love
> these things
>
> Dennis

DigiKey calls these Transient Voltage Suppressors (TVS) - they come
unidirectional or bi-directional.

  Mark

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I do small package shipping for small businesses, world-wide.