Wirewound Resistors in RC filters

[dknguyen]

So if I had a 1kHz RC filter, do you think I could use a chip wirewound resistor? 1kHz is pretty low and if anything I *think* the inductance *might* somehow help the filtering. At the very least I don't think it would have any negative impact.

Opinions?

 

[Sceadwian]

Won't hurt but you're right it's not likley to help either, unless you can find wirewound resistors designed with high inductance in mind.

 

[mvs sarma]

So if I had a 1kHz RC filter, do you think I could use a chip wirewound resistor? 1kHz is pretty low and if anything I *think* the inductance *might* somehow help the filtering. At the very least I don't think it would have any negative impact.

Opinions?

I fear the chip wire wound resistors are wound in a fasion the inductance is cancelled -- Halve the wire length by folding back at the centre - after winding the doule wire- solder the leads
instead you can staight go for chip inductors and call it LC filter

 

[Optikon]

So if I had a 1kHz RC filter, do you think I could use a chip wirewound resistor? 1kHz is pretty low and if anything I *think* the inductance *might* somehow help the filtering. At the very least I don't think it would have any negative impact.

Opinions?

If this is a low pass with the L in series with the R, it will help roll off the response. However, if The ratio of L/R is much smaller than R*C then, your little bit of "L" is really not doing much. I imagine that the parasitic L of a wirewound chip resistor is relatively small.

 

[Hero999]

What size are the wirewound resistors?

I've seen some huge wire wound reostats wound on iron formers that are so inductive that they draw a huge arc from a 24V supply when they are disconnected.