Encoder
Jim Staff
staffj at freenet.msp.mn.us
Thu Mar 7 05:07:38 GMT 1996
> Looks like a metal case TO-5 transistor with 8 leads and a lens on the end?
>
> If so, it's basically a reflective sensor with LED and photodetector on the
> same die. I'ts focussed to a spot size of .190mm, 4.27mm in front of the
> case. It has a photodiode with a single transistor preamp built in.
> Shouldn't be too hard to interface to, but making the wheel is going to be
> a bear.
Why is the wheel going to be a bear. Spot size will allow me to use .2mm
marks, the focal points a bit out there but I'll recess the sensor. But what is
the output voltage? And the transition time?
It's not a big deal because I'm using it on a digital counter circuit so all
it has to do is generate a positive or negative going edge >2ns in diration.
Opps by the way (I've never used these before) the reflection is the positive
voltage right?
Thanks... Cool beans!
Jim Staff
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