Mark Pictor wrote: >>>The nice thing about resolvers is that they are very rugged - >> >>with no >> >>>electronics in the resolver itself, they can handle high >> >>temperatures, >> >>>coolant, and other abuse that would kill an optical encoder in >> >>short >> >>>order. The bad thing about resolvers is that the circuitry to >> >>generate >> >>>the sine wave reference and interpret the resulting signals is >> >>usually >> >>>complex and expensive. >> >>And could now be put in one IC. >> > > > Ahhh, but they are still big bucks... somebody was selling surplus > R/D chips on ebay a couple months ago for $350/each. They used to be expensive. But, Analog Devices recently came out with the next generation of this, the AD2S1200, $18 in single quantity from Digi-Key. It not only generates absolute position, but it puts out a simulated quadrature signal.
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