Re: [CAD_CAM_EDM_DRO] Proper pull up resistors for optical limits

On Thursday 13 May 2004 10:16 pm, fun2b432002 wrote:

> They show a resistor between the +5V and the optical interrupter switch but
> do not give a value on the resistor.

That's probably because the correct value for the resistor depends on the opto
device...

> I assume this is a pullup resistor (I know very little about this) and I'm
> wondering if anyone can help me with determining which size resistor to
> use????

Sure.

> The optical switches are transistor output type, Min Output 0.5 IC @ 20 mA
> IF. Another type I may use are the same except Min Output 1.8 IC @ 20 mA
> IF.

I'm a little unclear here -- are you talking about connecting the resistor on
the input side or on the output side?