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Old 09-02-2014, 05:58 PM   #1076 (permalink)
e*clipse
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So far I've found two chips that could do the job. Neither of them are cheap.

1) Tamagawa AU6802N1 "Smartcoder" resolver to digital
2) Analog Devices AD2S1210 10-bit R/D converter with reference oscillator

Both are made for vehicle reliability and temperature ranges

I guess either method will require a small daughter board. Both IC's are high pin count (48) surface mount chips that will require a bit of support circuitry. Making a sine wave generator and envelope filter will require a bunch of analog stuff.

I've gotten most of the way through a envelope filter and sine wave generator, if you'd like.

Other than UPS, can you think of a cheap method of shipping a 100lb thingeee?

E*clipse

Quote:
Originally Posted by MPaulHolmes View Post
Yes, it sure did. I read through the PDF you posted, and see what you mean about the sin and cos envelope. I'm not sure of how to extract the peaks. I was reading up on that, and it seems non-trivial. I think that resolver to encoder chip sounds like a good idea. The board could be really little and cheap. I would very much appreciate borrowing one of those MGRs. It wouldn't need to be this week or next week, as I would have to make a board to deal with the resolver issue. Can you calculate what shipping would be?

OK! I searched for the resolver to encoder chip, and I can't find your link or p/n anywhere. Could you repost it?

edit: I found an envelope detector which seems simple. It involves a capacitor though. Care would have to be taken so that it doesn't cause too much lag in the detection.

edit again: It could be made to work, but the chip would be better.
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