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Thanks guys. Jay, I will have to do some measurements. Paul

Re: Blue Ray DVD Writer - Diode Harvest? pic 3

Re: Blue Ray DVD Writer - Diode Harvest? pic 2

Re: Blue Ray DVD Writer - Diode Harvest? Jay, got it in the mail today. Definitely pooched. Here are a few macro shots.

You could also use a small bit of conductive thermal epoxy for teh bottom pad, however, you would have to very careful not to short the other conductors.

You could also put a couple of vias under the chip, pre-tin and fill with solder and then heat from the bottom. Not pretty but it can work. You could also mount it "dead bug" style (legs up), put a copper strap across the top and solder it to the board.

That should flatten the V curve a bit as well. I look forward to you next plot. I wonder if LDs have the same Vf drop that many high power LEDs (such as the Luxeon) experience after burn in. Paul

Great graph, I would have expected a more shallow V curve. Very interesting. Thanks for posting that. Please tell us about your automatic tester.

Thanks amkdeath. knimrod, doh! I forgot about the one(s) that come on the board.  Are they soldered in or socketed?  Oh I just noticed that you have me down for 3, I actually meant teh 3rd group buy (batch 3) but you can keep me down for 2. Thanks, Paul

Did you find any in a SOT23 package or are they just available in the LLP?

knimrod, you can put me down for a batch 3 board as well. Do you have any spare LTC1050s you would like to sell? Cheers, Paul

Thanks for the LM3410 heads up/link. I think I may have to pick up some to play with. Looks like a versatile little chip.

If you want to use a DC/DC converter but don't want to go through the trouble, you could order a current-regulated driver from the Shoppe http://theledguy.chainreactionweb.com/index.php?cPath=48_49_61. He sells Boost, Buck and Buck/Boost converters. All you would have to do is change the sense...

Inductor selection always seems like a black art. It takes a lot of trial and error. Seemingly similarly spec'd inductors from different manufacturers behave differently. Remember to keep the leads very short from the switcher chip when running tests.

Do you have a delta/relative function on the fluke to negate the lead resistance?

Recall that you will have to account for the regulator dropout and the 1.25V sense voltage.

Direct feedback from a sense resistor would burn lots of power (375mW = 1.25V*300mA). You could use one of the feedback schemes posted for the last two ccts in post 63 above. The last one may be easier to implement. You could also find a chip with a lower feedback voltage.

ArcLS (grey market board) BadBoy NexGen (Shoppe) VIP (TaskLED)

Re: Blu-Ray Writer Harvest - Some Testing The GB diodes would have been an M or P type but with no PD. I have been looking for a pinout for the BR LD but haven't been successful so far. It may come down to testing. SAM's laser FAQ has a methodology for testing, however, I have to confirm if it...

Re: Blu-Ray Writer Harvest - Some Testing I would wait on implementing another LD until you are absolutely certain of the pinout. There are many styles.  Here is a sample from a Sanyo page (IIRC).  Thare may or may not be a monitoring diode (photo-diode).   Paul