Need help with design for GF's laser...

[IsaacT]

Okay,

So I told my girlfriend I would build her a 405nm laser. So I have had trouble with drivers and I thought "Hey! I could just stick an LM317 in there with a resistor like in this picture:

The diode is a PHR-805T, for which the pinout specifies that it is case negative. So all I should need is a wire running from the positive input of the PCB, to the V-in pin of the LM317, out of the V-out of the LM317, to the positive pin of the diode. The negative will automatically go from the host through the case pin, where it will complete the circuit.

My question: would this work? Have I missed something?

Thanks,
Isaac

PS-if the photo is too big I apologize. Photobucket decided to go all pretty and the resize feature is not where it used to be.

 

[Fiddy]

It sure will.

With a case negative diode you don't have to run a negative to the diode at all.

Use bout a 10~15 ohm resistor too

 

[TheDukeAnumber1]

When I gave my GF a laser I just made sure the host was very shiney :yh: That's pretty cool how simple that design is I never thought about it that way.

 

[IsaacT]

Ya I have had a lot of difficulties finding a driver that does exactly what I need and while I was thinking about alternatives I just thought "maybe I am over thinking it..."

 

[jwwilson23]

nice drawings! and what are you putting this into? cause idk how one would fit this in a flashlight. will it be in a project box?!

 

[IsaacT]

It will be in a flashlight. I completely drilled out the pill so there should be plenty of space. The resistor will be soldered as close as possible between the pins and a single wire will go to the positive of the diode. I think there should be space enough. I'll try it today and upload pics if it works

 

[jwwilson23]

oh ok. is this a popular host or no? want to see the inside and beamshots when its finished
good luck :beer:
and i believe you can file down the top of the regulator if it doesnt fit.

 

[Pilgor]

Well, if its for your girlfriend, it needs one of these

 

[Kartracer00]

^ omfg rofl
Thats the funniest thing ive seen since that post danefex posted on the servers crashing.

 

[jwwilson23]

:crackup:. Also the whole thread w/ someones neighbor who has security cameras pointed at his house. that was a good read when your having a bad day.

EDIT-here it is - http://laserpointerforums.com/f44/frying-camcorder-77375.html goes on for 5 pages...its great
the real stuff starts happening on pg. 2 i believe but the ideas start to form on first page, intro too. good stuff!
:beer: Justin

 

[TheDukeAnumber1]

Well, if its for your girlfriend, it needs one of these

Brilliant lol

 

[IsaacT]

Okay...for those of us who don't look at something and immediately know what it is, would you mind sharing? Gonna take a guess and say something that vibrates? *tsk tsk

 

[Laser Smith]

^^Lol don't tell me you've never taken apart a video game controller or anything like that? Yes that is a rumbler motor with a lopsided weight. Rumble rumble, the ladies love it. But there's no need for that right WB?

 

[ARG]

Okay...for those of us who don't look at something and immediately know what it is, would you mind sharing? Gonna take a guess and say something that vibrates? *tsk tsk

It's a pager/cellphone vibrator, so when you stick your phone on silent the motor spins and since the weight on top is not balanced it vibrates. I hope I don't have to explain the connection between vibration and it being for your girlfriend now

 

[IsaacT]

No need for that haha, thats why I deliver the laser to her in person

But no, I have never taken a game controller apart haha. I tend to use them more than destroy them

 

[jwwilson23]

i just took a guess and suspected its a vibrator :shhh: we wont tell anybody, we promise :eg:
and this forum isnt public or anything so your good i think *sarcastic*

EDIT-as in vibrator i meant something that vibrates... like a rumble pack lol

:beer: Justin