A cheap laser diode is the first thing you need to make your very own high powered laser capable of burning paper.1000s of laser diodes have died due to the lack of proper drivers A laser diode is current hungry, it will take all it can get.
i would advice you to wear safety glasses and not fool around while doing this project have fun and be carefull
what we are going to make today is something called as the LM317 constant current driver
so lets make one
Step 1: Materials
what we are going to need is
1 laser diode (you could hack it out of a dvd drive) x1
2 10uf 16v capacitor or 10uf 63v capacitor x1
3 1n4007 diode x1
4 10 ohm resistors x2
5 100 ohm variable resistor x1
6 lm 317 voltage regulator x1
7 veroboard x1
8 soildering iron
10 heat sink
all done !!!!!!!!!!!!!!!!!!!!
Step 2: What Actually Happens Inside the Circuit?
Laser diode (mine is red you could buy any color it hardly matters)
10 microfarad 16v capacitor (protects Laser Diode from immediate power supply especially when switching on/off)
1N4007 rectifier diode (protects Laser Diode if batteries are inserted the wrong way )
2 X 10ohm resistors in parallel ( sets the maximum voltage and current the Laser Diode will get)
100ohm variable resistor (allows fine adjustment of output current )
IMPORTANT! the switch MUST be placed between the battery and the driver, NEVER between the driver and the laser diode! doing so is as good as not making one of these
Step 3: Solder It Up
solder all the connections properly and always test your driver using a bulb before using your diode any wrong connections would kill it
also always short your capacitors
have fun and do not point it on naked eyes
Participated in the
Wicked Lasers Contest
zacka21 made it!