Tottaly homade laiser with lpc-826 510mah

I made a laser with lpc826,all the cost was about 20 euro
Lpc826---> 15 euro
Lm1084---> 1 euro
The case of the flashlight was forgotten in my cubbyhole
19650 batteries---> 2 euro
Axis----> 2 euro

The axis is the cheapest i found ,it's from a laser 5mW from ebay


The heatshink for the laser was from a Pentium 4,the heatshink is always cold ,I power the circuit with 7.2-7.5 volt with 0.5Amper for 5 minutes and the heatshink doesn’t increase not even 1 degree Celsius, maybe this is overmuch for this laser but all other heatshink i had are very small .I made a drill in the center and i place the axis



batteries are 2 18650 3800mAh as these says,but it not true!!!
I have to say even if says 3800mAh it last for only about 30 minutes with 500 mAh current so I I had to add a jack 3.5 mm from headphones so that to connect it with power supply and charge the batteries






the black case is from a very old flashlight forgotten in my cubbyhole, i place everything inside ,it has plenty of room



i made 4 drills and i place 4 angles so that to screw it up to the heatshink


I mean exactly this!!


Now ,the circuit was made from here
Laser driver - It can be done
But the difference is that i use lm1084 instead of lm317 because as i saw ,i cannot drive the laser with
the satisfactory current,it drive with only 300mAh, but lm1084 has a very low drop out voltage.Don't use lm317 anymore for laser projects ,it is veeery old !!
I have this multirurn trimmer


it is 100 ohm ,i use it so that to find out what resistant need the lm1084 between adjustment and output so that to drive the laser with 0.5amper,i find it needs 2.5 omh, but the trimmer was hot enough and i instead of it i place a resistor 2.2 ohm but when i measure it ,it is 2.5-2.7 oHm, the perfect resistant . it is 1/4 watt, its hot, but there is no problem.
So the synopsis , the only resistant between adj and out is 2.5 ohm,not more not less.


lm1084 needs heatshink, its a must it is really hot!! take care


Now, the cables

There are 3 conditions here

1.When S2 is closed i switch on or of the laser from the red button and power from batteries 7.2volts

2.When S2 is open like now at the photo, i can drive the laser from an external power supply 7.2 volts, on off is again from red button.
The jack is 3.5mm famale from headphones

3.And finally ,when red button is open like now at the photo and S2 is closed, i can charge the batteries from an external charger at same 3.5mm jack, without the need to take out the batteries from the flashlight !!!!

Here the jack 3.5mm for external power OR charge batteries ,depends the switches



Here is red button and S2









Here is the puzzle connection



And here the project is finished
















And here some videos while testing the project

Tottaly homade laiser with lpc 826 510mah vid 1 - YouTube

Tottaly homade laiser with lpc 826 510mah vid 2 - YouTube

Tottaly homade laiser with lpc 826 510mah burn - YouTube

REMEMBER don't make use of these laser without googles!! It is very dangerous ,it is not for playing, it is not not for young boys,you have to know how dangerous it is before you try

>>greetings from GREECE!!<<

Wow, that is impressive work. Nice use of junk yard stuff

Really impressive build :gj:
+1 :beer:

PS: I am from Greece also '' Σε ποιά πόλη μένεις ?? ""

Jim

lol nice rough build

Looks like you had fun! Good Job! :beer:

Thanks all, Μένω πύργο ηλείας
Does anybody knows if we can found a datasheet for lpc-826? I want to know how much current can hold up the diode ? the problem is not the heat,mine is very cold. How much current can pass through the diode without to destroy it. The best would be to test it and burn it, but i don't want to do this again,as i do it with another diode from a dvd burner.Does anybody did this test?

That is different.. very nice use of the laser.. :gj:
It doesnt matter if your using LM317 or LM1084 with a red laser diode.. The total curernt draw will be about 520~525mA and the excess voltage will be dissipated as heat..
Also i think this is because you are getting a very short battery life..
Love to see a good diy +1 :beer:

thanks
you may be right,however i couldn't drive the diode with lm317 more than 300 mAh,i don't know why, with lm1084 things are much better.
Nice post this with the battery.I know that Chinese are charlatans but not so much!!!Somebody told that this white powder is coca llloooolllll.:drool:

Man that's crazy!

It's Miliamps (mA) not mAh. :beer:

Hi mate tnx ,you are right

This might be due to load, the battery voltage sags if the load is out of its bounds.. Thus the low dropout in necessary..
I would recommend some name-brand batteries.. sanyo 2600 are by far the best and they are cheaper now.. also u can get them from LarryDFW he has some great knowledge of the batteries capacity and he keeps the best ones in stock to lpf members..

i have 6 of ultra fire 18650. I will test these ,i 'll keep a week each pair so that to compare the performance .i have in my mind sanyo

This build is EPIC! Nice work :beer:

Nice build.

This definitely fits my definition of ghetto.

It's ALL about function, I see. Form, psh, you made a flashlight that can burn stuff... who cares about what it looks like, right ?

I like!

Great job. I myself like to use stuff I have laying around. +1