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.