Re: [CAD_CAM_EDM_DRO] One dump encoder pulse question more...

In a message dated 8/30/2003 9:21:25 AM Central Standard Time,
mika.salmi@... writes:

> Does enyone know if I can make similar pull up with 5v and resistor as step
> and dir pulse line sometimes need?
>

Mika:

If they are "specified" as 5V encoders, then using pull-up resistors on each
output should be no problem. First, try 10K. If the "HI" is then still less
than 4.0 volts, try 4K7. If that won't bring it to 4.0 volts or more, I'd
not feel right suggesting lower pull-up resistance, as I have no clue what your
loading is, there.

One other "sure-fire" fix is to use a 74HCT541 buffer. THAT will gladly take
3 volt "IN" and will output "rail to rail" (i.e., 0.0 - 5.0 VDC) for several
milliamps loading.

Jan Rowland


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