Re: need L290 substitute

osr@xxxxxxxxxx wrote:
OK, its gonna cost you 3$ a chip, plus a counter, a dac , a jim
williams or Pease V/F design, and some glue logic,

but start here:

http://www.usdigital.com/products/ics.shtml

Steve
The problem is encoder jitter. if you use ONE V/F converter, it
sees the jitter both ways as counts, and rapidly switches back and forth between + and - outputs of non-zero voltage. it SHOULD produce an output very close to zero, as the + and - movements all cancel out. So, it takes TWO V/Fs which go to a
+/- summer. That is exactly what the L290 did, all so neatly in one chip! I'm trying to keep this circuit small, and was grumbling about the obsolete L290 only being available in DIP-16.

Jon
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