Re: [CAD_CAM_EDM_DRO] Need Encoder Hookup Help

On Mon Nov 26 10:10:23 2001, Jon Elson, <elson@...> wrote:

>Bill Vance wrote:
>
>> >>
>> >> You could try this:
>> >>
>> >> O +12V
>> >> |
>> >> /
>> >> \ 20K ohms
>> >> /
>> >> \ CMOS inverters run at 12 Volts.
>> >> .01 | |\ |\
>> >> 5V---||------+----------| >O---| >O-----to counter
>> >> sig in | |/ |/
>> >> /
>> >> \
>> >> / 20K ohms
>> >> \
>> >> /
>> >> \
>> >> |
>> >> _____
>> >> ___
>> >> o
>> >>
>> >> Use open collector TTL inverters if you need speed. They need a pull up
>> >> resistor on the output, too, but will probably work without the input side
>> >> components shown above
>> >
>> >Oh, no! This definitely will not work! You can't put a capacitor in
>> >series with the encoder signal, as it needs to pass signals totally
>> >down to DC. This would cause massive problems when the encoder
>> >was not moving.
>> >
>> >Jon
>>
>> Silly me, here I was thinking _digital_.
>
>Well, it IS digital. But, you must have been thinking of a steady-state
>system, where pulses were coming in at a steady rate. then, such a
>design would work fine.
>
>Jon

Roger that.

Ummm, perhaps I should have elaborated. I was thinking more in the special case
line, as in digital/linear/power/CNC/and more, etc. They all have their special
requirements, and they don't refer to, "morfidizations", as, "mixed signal", for
nothing, as they can get you real mixed up sometimes.....:-)

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