Phil,

How about a projecting oscilloscope?  Use the laser 
printer scanning block for the horizontal scan, and a 
small mirror mounted on a piezo-electric element for the 
vertical deflection.

Oh, and if you're running the laser pointers 
continuously, you may want to consider a heatsink, 
because they may not be continuously rated in their 
"pen" form...

Cheers,


Howard Winter
St.Albans, Herts


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