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10km... Quite awesome.

Interesting. Thanks

Erratum : Seems that these kids...

1) Tell me in which sentence exactly. Where did I wrote "I don't understand what they did ?" 2) If you speak french, you should understand why I said this. 3) Two mistakes on a "charging battery" topic made me an idiot ? 4) I apologize if my language was bad. That's what I was thinking about :D

It's a lifestyle.

Laserbee, one more time you just don't understand what I wrote. I didn't thought I was that bad at english. => WTF guy ? Do you really think I am that idiot ? Stop trolling me. If you could speak french, you would undestand what I said. These kids don't know a shit about transistors and...

You misunderstand what I said. I said : 3,6V is nominal voltage and I thought 3,8 should be max which in fact is 4,2. 12V was for a battery of 3 accumulator. Of course, a single accumulator shouldn't be charged with 12V, which is dangerous.

Seriously ? Nominal voltage isn't 3,6V (or 3,7 depending on the accumulator quality) ? Are you kidding me ? When I say 12V, it means 12V on a voltmeter. You are right, the load voltage is 4,2V. When I make my own chargers I use +5<x<+15% as you have seen, and +15% is exactly 4,13V. Getting a...

Well... If your 1300mAh didn't explode, why would 2000mAh do ? It's ok. Just don't let the charge last too long, but the charger should stop himself when load is complete.

Yes you can charge 2Ah with the 1,3Ah you used. Charge time will just be longer. I said max current should be 1/10 of capacity. Sometimes it is 1/1 and there is no problem if accumulators are good. Just check your charger. What's voltage and max current ?

20$ ? Seems like a fake.

I stick some li-ions with a higher mAh rating into the pack and get longer out of it? => Yes. If a laser diode requires 200mA and your battery is 1600mAh, you can use them 8hours. If it is 3600, you can use it 16hours. But the more capacity they have, bigger they are. the optimal voltage (4.2v...

Okay. Easy example : We don't care about the brand. Take 3 identical accumulator with nominal voltage 3,6V. (Battery 10,8V in total) Your charger's load voltage must be 10,8V +5%<x<+15% So 12,4V is the maximum you should take. Your charger max current should be 1/10 of battery's capacity. If it...

In France : Class I and II allowed for everydoby. IIIa,b and IV only for professional use.

Hello. I'm thinking about buying a red laser (650nm) I didn't study the output power I'll need, but for sure I'll need goggles. I heard Lazerer is a good website for lasers, but I have no idea about glasses. Can you tell me if these one are good or if I should choose something else : T-REX...

Thanks for the links. Troll mode on : I have so good ideas. I must be a genius.

I found this : Incroyables Expériences [56] Transmission du son par laser 2 / Laser communicator 2 (récente) - YouTube Look like these kinds don't really know a lot of stuff abound sound and amplification but what they did works. Sadly, I have no idea which kind of laser they used what's the...

In fact, I was thinking about making a wireless connection between a computer and speakers in a room. As you say, it would be easier to use wifi or radio frequences. But, I find the use of laser more fun. So I'll see if I can do it anyway. I was interested in data protection for military or...

I understand. The thing is, with radio frequences, I don't believe the signal can be sent in one single direction. Anybody can try to catch it, wich is not possible with the light beam.

Thanks Any idea about the power necessary to transmit information at 1km wireless ? And about the losses of light over distance ?