> >From David Duffy
> >The 3 pin IR detector may be 2 IR detectors with a common lead?
> >Does the encoder have 2 sections - one 2 pin and the other 3 pin?
> >I'd think that it'd have to otherwise it couldn't detect the direction.

Kevin wrote:
>I got a nice Infrared Picture of the phototransistor,
>and three other pictures of the mouse circuit, about
>200kb all together.
>http://www.members.dca.net/kben/misc/mouse.html
>Like they say, a picture is worth a thousand words.

It's too hard to see the transistor properly in the picture.
I just opened up a cheap mouse here and it looks like each
IR receiver is indeed a dual unit. One pin on each receiver
goes to +5V and the other two pins on each go to the micro
using 4 port pins in all for detection. The IR LEDs are wired
in series with a 1K2 resistor & hung between 0V & +5V.
Yours should be very similar. The Q1 & Q2 designations are
a bit misleading. They're not photo-transistors in the "normal"
sense of the 3 pin variety with a base connection. :-)
I hope this helps.
Regards...
___________________________________________
David Duffy        Audio Visual Devices P/L
U8, 9-11 Trade St, Cleveland 4163 Australia
Ph: +61 7 38210362   Fax: +61 7 38210281
New Web: www.audiovisualdevices.com.au
___________________________________________

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