NTC before DC mains filter?

[rhythmsandy]

There are many variants in blocking the DC at the main input. The unique common part is PTC after the filter.

http://www.diyaudio.com/forums/atta...s-what-right-main-dc-filter-10-variations.pdf

Now since we use higher VA transformers so using a NTC before all these filtlers for reduced inrush current right after the EMI filter does it creates any problem?

 

[DF96]

What does the PTC do?

 

[hego]

A PTC for inrush current limiter use?
May be a mistake?

 

[AndrewT]

That Thule Audio variation places DC across a polarised capacitor. I would not recommend that.
The PTC is a Positive Temperature Coefficient resistance.
It prevents the circuit working when load current goes too high. Same effect as the Mains Bulb Tester filament. It is a PTC resistance.

I think Thule Audio should be sent back to school.

 

[AndrewT]

Now back to the question.

using a NTC before all these filtlers for reduced inrush current right after the EMI filter does it creates any problem?

The PTC is shown in series with the DC blocker.
Rhythmsandy should also be sent back to school !