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How much current are you actually aiming for with these diodes? The same manufacturer makes a different part with a set value of 220mA: micro-bridge.com/A705.asp

It doesn't have to use a bipolar transistor, and there are plenty of examples on the web of it using a MOSFET instead. There are also examples of it being used for high power LEDs operating with over 1 Amp. Hopefully I am allowed to post this link: candlepowerforums.com/vb/showthread.php?t=75204...

Check out this link: worldtorch.com/LDO-regulator-schematic.php They use a LM334 which can operate with a drop of only 0.1V! The reference voltage is about 0.065V (compared to LM317 reference of 1.25V), so resistor selection is critical and is possibly difficult to find. (e.g. 0.065V / 160mA =...

I tried this, but it is very difficult to collimate both the red and violet lasers with a fixed lens (the PS3 has a motor which moves a lens depending on which wavelength is selected).

I have used a similar configuration to limit the peak current from a power supply I built, but in this case it was mainly to protect the power supply from being damaged if a short circuit occured in whatever it was connected to. I wouldn't use it as a precision current source for a laser diode...

I believe the max rating is 15 mW, but the only way to really find out is to sacrifice one. I measured just under 8 mW on the laser power meter for the module I made, but didn't want to push too much further for fear of killing it. Also, just put my order in for 2, so when they arrive I will...

Re: Voltage and Current to get best power out of d Be careful using a lab power supply - some have a tendency to dump their full voltage to the output when you first turn it on before correctly regulating the output. It happens regardless of what the voltage/current is set to, and only lasts...

I had originally intended to construct a step up circuit (Texas Instruments make some tiny controllers, eg TPS61071). A boost converter will work fine, but you need to carefully select an output capacitor to avoid too much ripple.

I used 4 x 1.5V button cells, check the multimedia section for a photo. Fair comment. The problem is if you try to adjust the output optical power, a small change in voltage can cause a large change in power. In contrast, the power is proportional to the current (above threshold) so it is much...

A 7805 is a bad idea. To control any laser diode you should regulate the current not the voltage. The reason that the LM317 works well is that it can be configured to operate as current regulator. There seems to be a lot of confusion about this on these forums :-? (P.S. At 5V my bluray diode is...

Hi.  Thank you very much for your writeup - seeing your webpage inspired me to build a bluray pointer of my own! w ww.laserpointerforums.com/forums/YaBB.pl?num=1188969419

Re: My bluray pointer Wow - that is a much better deal! :D

Re: My bluray pointer Where are you ordering the parts from? For the PS3 optical block, I would recommend divineo/supreme factory.  They are cheaper than most ebay sellers and ship within 24 hours! Here is a link to the part I ordered: www .divineo.cn/cgi-bin/div-cn/ps3-kes440  

Re: My bluray pointer No problem! That is a great website - lots of detail and practical advice on using the bluray diode from a PS3 assembly. Anyone thinking of building their own bluray laser should definately check it out!

Re: My bluray pointer This is the first and only bluray pointer I have built, so your one wasn't made by me!   I will definately take some photos during construction showing how to put it together if I make another one.

Re: My bluray pointer It uses 4 x LR44 batteries (1.5V each - total of 6V). The working voltage of this particular diode is approx 5.2V, and I am running it at about 27mA. I used the following page for info on the diode, although my operating current is quite a bit lower than his at the same...

Re: My bluray pointer I'm not quite sure what you are expecting - it is just a current limiting resistor connected to each push button (obviously a different value resistor for each wavelength). It was a red laser pointer which had white LEDs around the outside (hence the two seperate...

My first post - lets hope this works correctly!  :) This is a pic of my bluray pointer built from a PS3 diode.  The two momentary buttons control the violet and red lasers within the diode package, although due to the different focal lengths required the violet laser is well collimated, but the...