[sdiy] 3 phase sine VCO

[Scott Gravenhorst]

A few days ago, someone posted (from EDN, I think) about a 3 phase sine
wave VCO.  Did any of you super-brain people explain how this works - and
would it be linear?  (I've had some SDIY list problems, can't receive posts
on this address, but I can send posts...)  

Also, it was said that only certain CMOS inverters (unbuffered) would work.
 Can any of you say whether the venerable 4069UB would work and if not, why
not?

As a guess, it looked to me that a current source is used to supply the
power terminals of the IC used.  Is this true?  The schematic was a bit
weird to me.

Thanks again.

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