Did you try it with just the single .68uF cap and a single coil? Isolation to the DC port may be a little less, but that is really not that critical. I have never seen these things that had to use two coils.
Originally Posted by 4L4AGU
Usually, there is one cap in series, or maybe multiple parallel caps working as a single high current series capacitor, then a single non toroidial inductor of about 150uF or so. Then a couple of caps at the DC side of the inductor.
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