[sdiy] 90-degree phase displacement network calculations

[David G Dixon]

Pretty cool, David!

I've been looking for a tool to calculate RCs for an n stage all pass
network.
 

Thanks, Oren!  Yeah, given how easy it actually is, it is amazing how hard
it is to find out how to do it.  I had to dig up a 70-year-old paper from
some obscure old journal to get the straight dope.  There doesn't seem to be
any more recent source with this information (until tonight on this list).

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