for AWG conversions:
http://www.2devs.com/spip/Conversion-AWG-US-vers-mm.html
the core of the coil is not ferrite but magnetite.
apoc used iron oxide + resin:
http://lh3.google.com/sellier.bruno/Ro1HbtufD3I/AAAAAAAAAXs/sNenjoblJLM/0.1.Schemas%20des%20bobinages.jpg?imgmax=912
otherwise soft iron powder + resin.
coil construction:
http://lh3.google.com/sellier.bruno/Rp701gg6zTI/AAAAAAAAAdg/5jNyl_Z15MA/img054.jpg?imgmax=640
his album:
http://picasaweb.google.com/sellier.bruno/MachineDeMullerParAPOC
bill muller generator:
http://www.theverylastpageoftheinternet.com/research/replicate/blacksand.htm
a small translation (notes well the comment in red):
"
In most electronics or power cores, silicon iron or electric steel laminations are used.
This type of stratification causes hysteresis losses where by heating occurs resulting in losses in power efficiency.
In this invention, a highly efficient core
of iron oxide, (amorphous metal) it is packaged together with any suitable resin or plastic or is compacted and enclosed in a sealed container. The resulting product or products become the core off any electronic device or power.
This nucleus shows low hysteresis losses because the material immediately responds to the magnetic field and immediately becomes random when the magnetic field is removed. According to the Muller bill,
this material is formed when molten magnetite strikes sea water and splinters as it solidifies. The material that works the best is a combination of Fe3O4, Fe2O3, the entire range of non-metallic pint group, with traces of transition elements (rare earths), especially zirconium. What said, many types
black sand will work quite well, and some will work better.
The most important thing here is that these materials magnetize very strongly in the presence of a magnet and demagnetize completely when it is removed. In addition,
the material is an electrical non-conductor which means that as a transformer core, no eddy current seems to parry the passage of the magnetic field or heat the core in continuous operation. Other types of "ferrite" materials are known to have very high frequency response and are used as coils and radio antennas of cores in AM. Same with black sand. For the best behavior, do not grind the material. Leave the natural crystal structure (and magnetic domains) intact. Mix with an adhesive that is electrically non-conductive when it dries, and mix at least 70% black sand with 30% glue. The more black sand you have in the mixture, the higher the magnetic flux will be by volume and the weaker the structure. The more glue you have in the mixture, the more magnetic flux will be per lower volume and the stronger the structure. Find the blend that gives you the properties you want. From a "poor man's good place" to start is the epoxy slow set which cures in about 2 hours. It gives you plenty of time to get a complete mix. This information is for research purposes only. Not for commercial USE.
"
) to the one who gave birth to him