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Need hepl on identifying diodes, pins

B

BobbyPin

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Hello! I have harvested two diodes from ND-3550A DVD/CD burner. The problem is that i don`t understand which pins need to be connected to the positive/negative terminals. I might even be mistaken identifying diodes. As far as i understand on the right is the red-laser diode and on the left the IR diode. The laser diode has all pins in one row and that confused me.

Imageshack - picture021kj.jpg - rear
Imageshack - picture017t.jpg - front


P.S sorry for my English :whistle:
 
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L

light quantum

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ok, only the diode on the left is a 5.6mm (standard format) laser diode. Imagine a Triangle with the top on the right side and the longest side on the left ( middle of laser diode). Now the upper pin is positive, the right pin is case and negative and the bottom pin is the (mostly unused) photo diode pin.
 
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light quantum

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For the flat plastic diode try center pin positive, one of the outer pins negative. Worked for me once, but I´m not too sure of this, so don´t blame me if its wrong ;-)
 
B

BobbyPin

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Re: Need help on identifying diodes, pins

JellyCrab said:
Ok, so imagine this is the back of your diode with the pins. The black dots are the pins:

View attachment 27308
Click to expand...

Thanks, but as you can see the problem is with the laser which has 3 in a row pins :) I understand the standard laser pin-outs, but that is the IR laser and has no use to me (except if have mistaken).
 
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JellyCrab

JellyCrab

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Re: Need help on identifying diodes, pins

BobbyPin said:
Thanks, but as you can see the problem is with the laser which has 3 in a row pins :) I understand the standard laser pin-outs, but that is the IR laser and has no use to me (except if have mistaken).
Click to expand...

It is the IR, but the flat reds I have look differently that that one. BUT, the center pin is negative, one of the outers is positive, it won't hurt the diode to connect a driver to it, then connect power to neg and then the unused, no effect. So just try to two outer pins for the positive connection ;)
 
TTerbo

TTerbo

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jellies diagram is ok. should be the same with those diodes.
@light quantum you dont need to double post!!! there is an EDIT button
 
JellyCrab

JellyCrab

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TTerbo said:
jellies diagram is ok. should be the same with those diodes.
@light quantum you dont need to double post!!! there is an EDIT button
Click to expand...

It's that same pinout for IR and Red. It changes with blu-ray though.

EDIT: I just looked at the pic that shows the front. This is very bizzare, the heatsinking look very familiar to an SmOC red diode, however it's a flat red. Was there anything else attached to the diode/heatsink? A lens, more heatsink, etc. Did you trim it at all before taking that pic? Or is that the pic right out of the sled?
 
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