RE: [CAD_CAM_EDM_DRO] Linear encoder outputs

Look at (analog to digital) chips try http://www.analog.com/ there you will
find a huge array of what you need

Roger

-----Original Message-----
From: CAD_CAM_EDM_DRO@yahoogroups.com
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Roy J. Tellason
Sent: 30 June 2005 19:00
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] Linear encoder outputs

On Wednesday 29 June 2005 11:07 pm, philsumser wrote:
> Greetings All
>
> Does anybody have an answer to the following problem. I have recently
> purchased some Acu-rite Turnmate scales which I intend to fit to my
> lathe and milling machine. They are about 10 years old but are brand
> new and still in their sealed packaging. My idea is to connect the
> outputs of the scales into the serial or parallel port on a PC to act
> as a DRO(I already have the software for this). The output of the
> scales is analogue differential sinusoidal quadrature phase current at
> 7-18.5 micro amps into a 1Kohm load, but I need the usual 5v quad
> phase TTL signal for the computer. Does anybody know of a circuit I
> can build to effect this conversion?

I would take a look at using a 74HC(T)14 chip...

You get six gates in the package, each of which has a Schmitt trigger input
to square things up. If I understand your needs correctly this oughta do
it.








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