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Dvd-rw red diode with drivers from green laser?

buzz

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Joined
Apr 25, 2011
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9
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This picture shows the pin-out of a red diode.

Can someone please explain what the 'Not Used' pin is for? It is obviously there for a reason and I see it connects directly to one side of the laser thingy (you can tell I'm a pro!).
Thanks in advance...
 









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