I don't know if you've ever used magnet wire before, but it doesn't have traditional insulation. It has a sort of oxidized (or something similar) coating. You can 'strip' this coating off with a cigarette lighter. Just make sure that whatever gauge magnet wire you choose, it can handle the...

you could always just regulate the whole PC's power. My idea on this would be look at ham radio surplus. For instance, I have a 40V, 8A linear power supply (~25 lbs and quite large) that could be turned into a linear PC power supply with an additional assortment of voltage dividers and...

Awhile back I bought just about every 1/4" jack I could get my hands on. And as far as a solid feeling when you plug in, the neutrik locking jack was definetely number 1, but number 2 was the deluxe radio shack jack. It has a black rectangular casing, like 8 pins, and a little gold ring at the...

It might just be me...but seems like you've basically just built yourself a gold plated solderless breadboard. Cool stuff though.

just something to think about... but if this is for a super high brightness bike light, try looking at the luxeon star LED's. They are REALLY REALLY bright. And being that you're thinking of 20x white LED's, the price should be similar too.

As far as I can tell, you're SOL. The linear pot + resistor as aprox log is only good when you're deal with a voltage divider. Here, we're talking about a simple rheostat. I can't think of a good way to get variable log resistance other than using a log pot. Sorry.

wow kevin, that is seriously impressive Plus the "This magnet contains approximately 12 miles (19 km) of superconducting wire." "dissipating the heat generated from the 85.5 kJ of energy that is stored in the energized magnet" Those little specs in themselves show the sheer enormity of...

Quote: Originally posted by meat01 Looks like somebody's got a case of the Mondays I do believe someone would get their ass kicked saying something like that. Wow I love that movie

Quote: Originally posted by kwhead Well, since niether silver nor copper is ferromagnetic I'm guessing those old quarters would be pretty difficult to pickup regardless of their weight . One thing that can help *a lot* is to guide the flux from the end of the magnet not pointed at the...

for god's sakes...there is another thread just like this 3 threads down and another 1 page back. http://www5.head-fi.org/forums/showt...threadid=68067 Try and keep things consolidated with like 2 seconds of searching please

Quote: Originally posted by Voodoochile Canadian quarters can be picked up with a magnet. I was thinking the same thing until I saw where Kelvie hails from. True, but I still like the method I came up with. That way you have no bumps on the quarter to increase the gap, and you have...

http://www5.head-fi.org/forums/showt...threadid=67316

ok, here are some other thoughts of mine.... because inductance increases with diameter of the coils, using a larger coil diameter is in your favor. However, this also means you need a larger core. I would suggest finding a high permeability piece of iron stock, machining it into a...

Just playing around on google.....few little facts for you to play with --------- The force between two magnets equals B2A/(2KU0) where: B is the magnetic field (measured in teslas), A is the cross-sectional area (in square meters), K is the relative permeability of the magnet...

oh, and for resistor matching, build yourself a wheatstone bridge