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[Reply #30 on:]

You can't wire modules like that in series, you will need a stabilised supply.

So, it would be better to do it parallel, with 3v and 2A? (8x250mA)

[Reply #31 on:]

Yes. You need a good regulator or split them up into two or more groups with a regulator each. Also have plenty of decoupling capacitors between each laser module.

[Reply #32 on:]

Yes. You need a good regulator or split them up into two or more groups with a regulator each. Also have plenty of decoupling capacitors between each laser module.

Thanks! I'll have to re-do my drawing, although I'm not really familiar with using decoupling capacitors and regulators.
For the capacitors, would wiring a cap from before the laser, to the ground (for each laser) do the trick?

[Reply #33 on:]

I'm not really familiar with using decoupling capacitors

See my page:-

http://www.thebox.myzen.co.uk/Tutorial/De-coupling.html