Homebrew PCBs

On 09/03/11 06:36, jmelson2 wrote:
> I use Kodak digital sciences laser recording film, apparently made for laser recording of medical scans.  I don't know if regular B&W paper is red sensitive.

It's not -- but it is blue sensitive! Hence the use of a BluRay LD.

How did you rig up the laser driver? High speed opamp to generate 
constant current, then another one driving a transistor/resistor shunt 
to short over the diode (and thus set the current through the diode)?

Thanks,
-- 
Phil.
ygroups@...
http://www.philpem.me.uk/