Re: [CAD_CAM_EDM_DRO] Re:Inductosyn DRO was balls

Keith Bowers wrote:

>>>http://products.analog.com/products/info.asp?product=AD2S90
>>>AD2S90-EB PRODUCTION Evaluation Boards - COMMERCIAL $89.06
>>>AD2S90AP PRODUCTION PLASTIC LEAD CHIP CARRIER 20 COMMERCIAL $29.16
>>>
>>>
>-------
>I expect to need a 2-axis resolver to quadratyre board, so I did a bit more
>checking.
>
>The evaluation board price above is quantity 1.
>
>Unfortunately the above price for the chip is quantity 100 and is not
>available for online purchase from Analog Devices WEB site.
>
>Pioneer has ad2s90ap in stock with the quantity 1 price as $44.86. You
>probably want an ad2s99 reference oscillator @$10.73 too, but out of stock.
>
>At a guess a 2-axis board with just quadrature output could probably be hand
>wired for around $125 with all new parts.
>
>More thinking is in order; such as serial out to a computer.
>
>

I have looked at these, and someone finally got smart! The cost for a
12 bit board back in 99 was very high. It took 2 8 bit convertor chips,
a special chip to add their outputs together, and a high priced osc. The
8 bit chips were on the order of $300.00 each as I remember, and the
adder was about the same.
Bill Higdon