this is the awesome red laser i extracted from my old 20x dvd burner! it's amazing how well it burns, in this video you can't see well how it does because of some things, first of all i initially shorted the driver and that caused the lm317 to heat up, second thing the focus point was too far for awesome burnings. but i'll upload one more video showing that it can burn through a CD case in about 3 seconds! enjoy!
This laser can do so much more! it's 5x more powerful and blue! http://www.youtube.com/watch?v=Imo8DuhkgiU i'm burning a samsung galaxy S3 with it so make sure to watch it ;)
Me and 2 friends decided to ride our bikes from Castagnola (TI) - Switzerland (300m.o.s.l) up to "Balcone d'Italia" which is in Italy at the height of 1314m.o.s.l
Up there you can get one of the most amazing overview of the whole lake of Lugano and on a clear day like this you can see as far as Milan which is about 80 KM far!
It's the first Wednesday of February and that means one thing: It's general emergency sirens test in Switzerland!
This year I almost forgot about it and I was sleeping when they went off the first time. That plus the fact that it was snowing and the weather was kinda crappy led me to only record the sound of it.
That said, the sirens you hear are called APEX 4. Enjoy!
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https://www.youtube.com/watch?v=PV6sZDfGyzw