Yeah I was just thinking of wiring two filaments in series and feeding them with a 7805, that means a 10 ohm 1 watt resistor. That way I'll have the best of both worlds; minimal gradient effect, easy DC and resistor protection
So now I only have to figure out wether my two transistor driver is a good way to drive my IV-11 tubes :) A big thank you for all the help until now, I've only got my driver question remaining :) Op dinsdag 19 november 2013 21:15:05 UTC+1 schreef Gideon Wackers: > > 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 >> >> -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/eb0bc018-3996-4f47-afa0-da83b9a4eedf%40googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
