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



>
>--
>Best regards
>
>Tony
>
>http://www.picnpoke.com
>Email sales@picnpoke.com
>
>