Re: 12x Murder Fund! (Complete!)
How/why do you conclude that?
Larry dug up some charts showing the pulsed power requirements for different speed writers.
Before that we didn't have much info on actual requirements... We've been guessing for a while that 6x's require 100mW CW / 200mW Pulsed. This seemed to be somewhat confirmed, when i tested the 100mW CW Nichia and except for the different aspect ratio (rounder beam) it behaved exactly like a 6x.. Altho 6x's could be the 105 / 210mW Sharp diode, but this is just another guess..
The charts Larry posted in his thread about 12x writers a while ago show 200mW for 6x's, 240-250mW for 8x's and 300mW for 12x's (drive manufacturers always think in PULSED power)...
The charts confirmed our guesses about the 6x's and for the first time gave us an idea of the actual ratings of the diodes we use...
The reason i said 300-320mW is because the charts say 300mW, but Sony shows a 320mW pulsed diode on their web page as designed for 12x's (i am not sure if it says "In Production" or still just "Planned" tho).
And since we don't know which manufacturer's diode Pioneer went with, i think we should start with a "safer" assumption of 300mW pulsed and go from there...
Larry calculated a current which would be as much higher (in percentage) as the rating of the diode is, when suggesting a test current...
I don't think it works like that Larry
We don't really know how it works. That's why i was wondering how "flexible" which diode is, when it comes to how far they can be overdriven.
Clearly there is a big difference between GGWs and 8x's.. The 6x's can go to approximatelly two and a half times their rated CW power, the 8x's as high as three to four times!
Since the behavior is different, we need to take a carefull approach to testing the 12x.
Clearly we are interested in AT LEAST the powers the best 8x's can already reach (and then some)! And high efficiency 8x's are reaching 500mW+ at 360mA...
Maybe we should start at 360mA, and check after five and ten hours, and if the diode is not degrading too rapidly, go from there.
P.S. It does not seem likelly, that the second 8x will die before the 12x gets here (not that i want it to!), so i'll need another heatsink capable of keeping the 12x cool, so i can cycle two diodes at once. I'll also need to get another counter and make a second sensor.
The 8x at "only" 300mA warms up to 28°C with an ambient temperature of around 20°C, even tho it's off half the time...
The 12x will create more heat than this. I was thinking of a heatsink with a flat side i could mount onto a finned heatsink and add a fan to it..
