> of around 28 Ohms and a "cold" filament resistance of < 2 Ohms.
> One solution of the car industry is to switch between around 3V
> and 12V, then the difference will not kill the driving mosfet and
> the intensity of the 3V "preheating" is nearly not visible

Ah, I knew pre-heating is used in displays but was not aware of
it in vehicles. This would be for a very short time before the 12V
is applied - 3V not there all the time ?

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