Yeah I think I'll go for a Op dinsdag 19 november 2013 21:07:42 UTC+1 schreef jrehwin: > > > Do any of you use some sort of protection circuit for the filaments? > > I just use a higher voltage supply and a series resistor. That way, the > difference in current between a cold filament and a hot one is less, so the > starting surge is minimized. It's less efficient than just driving the > filaments at their rated voltage directly, but safer. Another approach is > to use a current regulated supply instead of a voltage regulated supply - > then you can skip the resistor. > > Note that if you're using a 7806 anyway, the efficiency is the same - it's > a linear regulator, so the heat shows up in the regulator instead of the > resistor. In this case, I'd either use a 7808 and a resistor (reducing the > heat on the regulator and gaining some protection), or wiring it up as a > current source: > > http://www.circuitstoday.com/fixed-positive-voltage-regulators > > As it happens, the 7806 does have the ability to limit current, so it > won't give the cold filament more than 1.5A or so anyway, which helps a > little (it's still more than 3x the rated current, however). > > - John > >
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