Everything I had read thus far told me that I needed a circuit which supplied a constant current to the laser diode. It would have been easier if I could have just connected the laser diode to my DC power supply and adjusted the voltage, but that would have been too easy.
About six months ago, I purchased a Sharp Aquos BDHP20 Blu-Ray player to watch movies I rent via Netflix. The DVD player worked perfectly for several months, enabling me to watch all sorts of movies in high definition. Life was good.
Then one day, a disc refused to load. I figured it had a scratch, and I tried other Blu-Ray discs. None would load. I found a firmware update, and updated the firmware. No go. The player still wouldn’t read the discs. It played DVDs just fine, but not Blu-Ray discs. I eventually got frustrated enough to purchase a new Blu-Ray player, figuring I’d dissect the old player and extract the Blu-Ray laser diode. Continue Reading