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Lucidscience Build The Laser Night Vision Page 3 Of 1334GHB2ALaser DiodesNoticeIn the absence of confirmation by device specification sheets,SHARP takes no responsibility for any defects that may occur in equipment using any SHARPdevices shown in catalogs,data books,etcContact SHARP in order to obtain the latest device specification sheets before using any SHARP deviceInternetInternetRegardless, in that case, putting the 1N400x diode *reversebiased* and in parallel with the laserdiode should protect the laserdiode from reversepolarity Now, there're other characteristics of the LM317 that aren't explained in the datasheet for the currentsupply schematic that *are* explained for the *voltageregulator* schematic eg where to place protectiondiodes Sam S Laser Faq Diode Lasers Dvd writer laser diode datasheet