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I love you. I mean that in the least creepy way possible. But I love you. Thread closed. Thanks guys. Done deal. This forum is amazing. If I could give reps, I would, but I cant yet. I'll throw some photos up when I have my project finished. Thanks everyone! -Liam Edit: Turns out I can...

Ok, so I have done some experimentation. It turns out to be supprisingly easy to do. However, I still do not understand the rules which govern this system. Basically, what I need it this: A complete guide to calculating electromagnetic field strength and shape, that takes into account all of...

Can I get a large enough coil? I was looking for somewhere in the 4 inches range. What sort of speaker has a larger enough coil for that? Does the size even matter? Or is it just number of coils? Or current? Oh dear I'm afraid I am a complete newby. Thanks so much for helping me out, cypragon...

Thank god for this forum and its incredibly competent members. Ok, so the goal is to set up a coil that will vibrate a small magnet from a few inches away. It only has to move it the slightest amount. I dont have any of the equipment yet, so I am looking for suggestions. Wire? Core? After...

Hi! This forum has been extremely helpful to me in the past, and I am hoping I can get a little more benefit from all of your collective experiences. I have recently become interested in electromagnetic fields generated by electromagnets. I have not, however, had any luck at all figuring out...

No WAY! That is SO SICK!! I'm doing this now. Seriously, if you made an in-depth thread on the subject, that would be the coolest thing ever. can it be done with a 445nm? And... this is going to sound dumb but... how exactly does it work? I am familiar with the "scratch and light" ones, but ive...

I allways carry an ultra-fire 502B with me. I was extremely impressed by the fact that it makes an ultrabright dot at up to a hundred feet or so, while still casting enough light around it to iluminate large areas at close ranges.

Wow. Just like that. That easy. WHERE DO YOU GUYS LEARN THIS STUFF? You have no idea how hard it is to find one of these things without the proper name. Yes. A diffraction grating. Thanks so much! Feel free to delete this embarassing thread any time you like now.

Ok, this is an idiotic question... But I have to ask it. I have seen people shining lasers into devices which split the main beam into many smaller beams, casting a grid pattern onto a surface. I would really like on, but a half an hour of googling has not been succesfull at finding out what...

Ok, the pepper spray is on its way. I asked my chemistry proffesor about it, and we had a little look at its effects on eyes an lungs. Nasty stuff! And not a bad range. Honstly, I fully expect anything I hit with this to be unable to follow without falling over its own feet. This is as close to...

I would prefer a gun. Really I would. I just dont have a funds. And, although I could get one from a familly member, the consequences if I were caught with one would be extremely severe. Peper spray: Good to hear. Baton: On its way. Honestly, as far as batons go, I have allways been trained to...

Will this work? Low Battery Alarm Car 12VDC Project Kit DIY | eBay

All jokes aside... I suppose I hadnt really looked into the laws on the batton, just assumed it was ilegal. Turns out, it isnt, I just need to buy it local, since customs wont let it in. Weight is not an issue, and most defense items I carry tend to be kept in a lower back holster...

Re: I Hate Lasers I'm sorry... what part of my post was a failure? Please explain your lack of tact. I understand that a laser detector alarms the owner when a laser is detected. If it did not alarm the owner there would be little or no point in owning it. My question was how does it work...

Re: I Hate Lasers I'm sorry, I havent read this whole thread, but one thing has me really, really excited. Laser Detector? Win. Now... where do I get one? And how does it work?

I have a stupid sounding question... Who has experience with collapsible hand to hand weaponry? I cant have a gun, and a knife is to short for my taste. (doesnt work with kicks) I have allways felt most comfortable with a batton, a sword, a cane, or even a simple stick in hand. The problem with...

Hey guys! I'm back. I need this to be short so here we go: My friend has set up a wind-turbine to power his house off-the-grid style, and he wants to set up an alarm to tell him when the voltage goes to 12.6/12.7 . He would like to to be variable (a simple potentiometer would suffice) and he...

I'm sorry, I just have to ask... this is a terrible question... why not? I for one will never buy a laser, since if I'm going to spend that much money on something I will allways want to learn about it as well. Thats where you guys come in :D But, as far as I can tell from there...

Well, we had a nice little chat about it. I emailed him a parts list, a complete and detailed instruction set, and told him how powerful it was and how to treat it. I had an idea. He is VERY persnikity about gun safety, allways scolding me for holding it wrong or letting the barel drift even...

Simple as that, eh? Thanks so much guys! +Rep