Reply to "DCS Choke Tutorial (semi-analytical)"

Adrian!OGR Forum Member

ogaugenut posted:
A 22 uh choke has been talked about and recommended on the forum for years. In light of all the new research and analysis that has been conducted recently, does 22 uh still seem like the best value for a DCS choke?
Thanks
Bill

Lets calculate some cases!

22uH is going to be about 2pi 1 MHz x (2.2x10^-5) = 138 ohms

The TIU is about 2 ohms. So the voltage divider will be about:

(138/140) so basically 1 meaning all the TIU voltage appears on the train.

If we made it 220uH it would be 1380 ohms (everything X10) so we'd have

1380/1382 so basically 1 meaning all the TIU voltage appears on the train.

At 2.2uH it would be (13.8/15.8) so about 90% of the voltage appears at the train.

So you want something you know... above the 5-10uH. Practically speaking, 95%, 99%, 100% are all the same thing since it's not an ideal noiseless environment.

6/8/184:34 PM

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