Recent content by akamine

STEI well this project is really interesting I think :) I had fun experimenting it. My team has decided to to make a gaussian rifle too looks so much easier but has few limitations How do you know the ESR rating of a capacitor? Is it printed on capacitor's body? Thanks, I've got the...

@glen.ricky : LOL yes. I'm an ITB student :) Did you put the paper clip close enough to the coil? Based on my experiments the paperclip wouldn't be attracted unless I put about 1/4 part of it or more inside the solenoid.. I've tried 10,000uF 16V capacitor. It could attract the projectile into...

Okay.. I'm not sure what do you mean by this. More descriptive explanation maybe? Do you mean to put a nail and the projectile inside the solenoid at the same time? Okay, I've tried again and now I notice that the paperclip move a bit. The capacitor works, but like you said, it is not powerful...

Yes I put all my four capacitors in parallel and the batteries in series. Iron core? Do you mean for http://repositorium.sdum.uminho.pt/bitstream/1822/6051/1/76.pdf" ? I'm trying to make a coil gun that works on attraction like this picture : But I'm using just one coil. From what I've...

I can't use AC since the project specification is restricted to 12V DC or less. No AC. I have charge the capacitor for some seconds and try to discharge it to my made coil, it is 6 layers 100-200 turns each. but nothing happens. I also tried to discharge it with LED. I was expecting that the...

thx for reply Well, the project specification is DC, not AC. by the way, this just came in my mind : Do you need exactly 63V DC power source to charge 63V 100uF capacitor?

Hello again, well after finishing the solenoid (https://www.physicsforums.com/showthread.php?t=309671), I'm stuck with a problem again. before that, let me give you a little background. Well actually I have a project on making a magnetic launcher. This device should be able to launch a...

thanks I did not know the wire is insulated. It works just fine after I scrap it :) many thanks

Hey, I have a school project and I need a solenoid to induce a magnetic field. http://www.yourpicbox.com/images/orhBIhKZq6426.jpg I made a solenoid by winding a wire (I'm not sure what to call this wire. It's thin and brown.) to a pen case. I made 3 layers, 100-200 turns each. When I tested it...