Kiplay's at it again! This time - BluRay!

http://www.instructables.com/id/Blu-Ray-Laser-Phaser!/

DDL - get stocked up on your Blu-Ray diodes. ;D

I know he's using the circuit from the 'phaser' but I can't believe he's only used a resistor. It's DIY Red/Maglite all over again.

I guess this is good becuase of 'lasers to the masses' but I also think it's bad getting 1000's of people popping blu-ray diodes without a propper circuit. Which could generate negative vibes.....

(Sorry if this has been posted) - Please delete in that case.


Dan

You posted before me....

Lol - and sorry - it just appeared in my instructable RSS feed!

He's super smart at all his other stuff, but the minimag is just stupid. It would be smarter to tell people to buy a small lithium battery and fit it inside the mag lite with current/voltage reg. and all! that would be cool.

Aixiz got screwed over quite badly from the big flood of module orders...

Could someone link to here if they have an account? :

I want to really grill this guy this time...

NO ONE EVER HOOKS UP A FREAKING DIODE TO A BATTERY WITHOUT ANY PROTECTION AND CURRENT REGULATION... EVER!!!

Not that that's out of the way... if you want to know how to make your own WORKING BluRay laser... look at the Group Buy section BluRay threads and the Experiments and Modification laser driver circuit threads.

Good luck;
DDL

Never mind... I just posted on there... ;D

--DDL

HE IS DOING IT AGAIN?!?!?!?! that dumbass, he is telling the world how to blow up diodes and everyone is believeing him, me sad now :'(


;D

I foolishly followed his guide for a red burning laser dvd laser mod, and blew my diode :'(. Luckily, that guide is what got me interested in lasers

that what got my interest as well.. i dont know if not using a circuit is really that bad. ive only had one diode so far and i ran it from 2 aa batteries for a reasonable amount of time. then i stuck it to a 9v and it died instantly. i thought it would take a bit longer than that.. live and learn

well yeah with laser diodes, hooking them straight to batteries is abit of a gamble, they could last a couple of years, months, weeks, days, hours, minutes, seconds and hooking them straight to batteries will most likely allways kill them instantly. you musta had abit of good luck at the time!

spyrorocks said:

Luckily, that guide is what got me interested in lasers

Click to expand...

Same here!
And, my chair leg just broke.
It skared the hell outa' me.
And my but hurts....

Oh well, this one is a little less crazy than the direct-driven LD from two AA's. The 9v battery with 150 ohms resistor provides current limiting to some degree, probably sufficient not to blow it up straight away. It'll dim quite a bit with dropping battery voltage though, so no replacement for a real driver.

Given the sensitive nature of the bluray diode, i think many people will still just destroy it during extraction or ESD problems when soldering.

Personally I don't see any problem with his instructions to use a resistor and a 9V battery.  Yes, the output will drop as the battery goes flat.  Yes, proper current regulation would be a much better option.  But a resistor is simple.  With 150 Ohms the current is only 27mA, so the diode is not being pushed to its limit.

While I am on the topic, I really cant understand the advice for typical current values to use for the PS3 bluray being given on this forum.  Perhaps everyone here likes to push their diodes to the absolute limit?  I just assembled my 2nd pointer from the GB blurays, and get 15mW output on the laser power meter from 32mA - above this I saw some mode hopping, so was quick to turn the current down before damage occurred.  The advice on this forum seems to be to use 45-50mA, which if you want to really push it to be able to light a match that's fine (all I can say here is wow!), but for someone who just wants to make a bluray which lasts more than a day this current level seems way too high.

I would suspect that the number of dead blurays connected to intricate current regulation and filtering circuits from advice given on these forums would be higher than the number of dead blurays connected to a 150Ohm resistor and 9V battery from kipkays tutorial (ignoring failures due to static, heat from soldering etc).

well one thing i see straight away, is there is nothing to protect the diode from spikes! when you first turn it on, the spike from the battery can sometimes be about 10X more than what the battery normally supplies, which is instant death for any diode. another thing with just using a resistor, is if your 9V is really good, the voltage may be higher than 9V, witch could kill the diode too! He could atleast use a capacitor! Us "proper" laserists want our diodes to last a nice long time, whereas some people are just so cheap and desperate to get it working, they will just use a resistor!

things said:

well one thing i see straight away, is there is nothing to protect the diode from spikes! when you first turn it on, the spike from the battery can sometimes be about 10X more than what the battery normally supplies

Click to expand...

Care to prove this?

things said:

another thing with just using a resistor, is if your 9V is really good, the voltage may be higher than 9V, witch could kill the diode too!

Click to expand...

even at 9.5V it would only be 30mA, so it isnt going to kill the diode.

I'm not trying to say that a resistor is the best way of doing it, but I am saying it will work fine so long as you dont mind it dimming as the battery goes flat.