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  1. C

    Where's a good place for diffraction grating?

    Hey guys...building a spyrograph...anyone got any good places/ways to buy diffraction grating? thanks! -Ray-
  2. C

    Help wiring True Green Laser 5mW

    Hey guys...building a spyrograph and need to wire up my True Green Laser Pen 5mW to power...I have the pen and cannot seem to get it working on my PSU...I've got a 5v line coming out which i've resisted down(58ohm) to 3V which is what the pen requires(2xAAA) but it won't turn on when i connect...


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