Encoder

[Jim Staff]

> 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