(Jay) wrote in message . com...
The advantage of putting your emmiters in series (rather than
parallel) is that you pull less current. The mark to space ratio
people have been discussing isn't that small. I don't think it would
be a problem, but if you wanted to reduce the surge you could charge
and discharge the gate of that big FET more slowly thus having a
slower turn-on speed. You could do that by putting a high value
resistor in series with the 555 output.



the white 5 watt luxeons have 6.5v forward voltage at 100 ma, rising
to 7.5 v at 1 amp. so you cant put these in series if you have a 14
volt system.

a bypass capacitor or emi filter at the circuit should eliminate emi
due to the rapid switching of the FET. i think this is a better
solution than
slowing the swtich.

i will try to post the circuit later this week.

-Jeff