No, the filaments are tungsten and tungsten has a huge positive
temperature coefficient. The ideal drive would be a constant current,
voltage capped source. A resistor approximates that quite well.
I would not connect them in series for the same reason it's a bad idea
to connect vacuum tube fila
> Do I understand correctly, that they work just like a resistor?
It *is* a resistor, one with a largish positive temperature coefficient.
> My plan is to drive IV-6 filament by directly PWMing it from 5V or 3,3V. It
> normally requires 50mA@1V, so if the filament works just like a resistor, can
Hello Ten
> Another idea is to connect 4 tubes in series. Of course it will make a
> voltage gradient across tubes, but I plan to drive anodes at 50+V, so maybe
> it won't be visible - does anybody have any experience with driving
> filaments like that?
> A step-down converter sounds good, but I
Do I understand correctly, that they work just like a resistor?
My plan is to drive IV-6 filament by directly PWMing it from 5V or 3,3V. It
normally requires 50mA@1V, so if the filament works just like a resistor,
can I PWM it with low duty cycle (4% on 5V and 9,2% on 3,3V)? Of course PWM
freque
