Re: [CAD_CAM_EDM_DRO] Sinosidal Encoder signals to TTL signals converter

i'm glad it helped you. good thing you are already
familiar with the linear encoders.
you said: 'you'd get a voltage swing from zero to 11
uA.'
things like this which may seem self evident to you,
already knowing the technical data, WILL be obscure to
ppl who aren't and confusing to ppl who measure
voltages with Volts and current with Amps.
after your 'explanation' there is still insufficient
information (for me). this is my own deficiency,
certainly.
volts pp at 11uA would be really nice to know.
knowing is it full quadrature would be rather
necessary if one intends to decode step/dir signals.
a resistor and a comparator isn't the whole job, if i
understood what little i did correctly.
and i'm off the case. this is exactly what i didn't
want to get sucked into. bleh.
debouncing circuit takes 15 seconds
quadrature decoder takes 5 minutes
my allotted time for this problem has been consumed by
discussion. account is now empty.

--- Jon Elson <elson@...> wrote:

> juan gelt wrote:
>
> >no. it doesn't help a bit.
> >google helps. babelfish helps. as a last resort,
> why
> >not call up heidenhahn? they might know something
> >helpful since they make these things all day
> long...
> >why me, lord?
> >when you've done your homework, go to #electronics
> on
> >efnet and get answers in a minute.
> >
> >
> Actually, it helps quite a lot. 11 uA is the
> standard signal on
> Heidenhain analog scales. If you put a 1 K Ohm
> resistor
> between the encoder signal and ground, you will get
> a voltage
> of 11 mV. You can set up a comparator chip, like
> the LM193,
> to compare that voltage to a threshold that you set
> to be
> in the middle of that voltage swing. So, if the 11
> uA is set
> up with one peak at zero and the other peak at 11
> uA, you'd
> get a voltage swing from zero to 11 uA. In that
> case, you'd
> want to set the threshold at 5.5 mV. If the current
> swing has
> some offset, you'd need to set the threshold higher
> (or lower)
> to get approximately equal times where the signal is
> above
> and below the threshold.
>
> Jon
>
>
>
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