Low carbon steel has a flat B-H curve (low hysteresis) and is much more easily available than ferrite cores. A better way to make a core is to use sheets of low carbon steel with thin insulating material like varnish or paint between them. The issue you get with a solid material is the volume resistivity issue and some energy is dissipated as eddy current losses. You can probably get decent results using a low carbon steel rod(say type 1006) of about 1" diameter as a core.
My question is, is this all I need to know about choosing ferrite cores? And where can I buy ferrite cores on the internet or in what stores in general?
Also Marcus wrote that "When choosing your core you should look at the data sheet and make sure that the BH-graph is linear and that it has as small as possible hysteresis." I only read two things on this forum about choosing cores: You should look for ferrite to use for inductors, look for ones with high "H" and B" values. I've heard that only some ferrite is suitable for winding inductors. The designer of my cross-over (alvaius) recommended ferrite core anyway. So I will make the 12 mH inductors ferrite core instead. of 12 gauge magnet wire and according to calculations I only needed 24 lbs., but I guess I didn't wind them very neatly and therefere thighly enough and I ran out of wie. I got done with one of the two 12 mH inductors I had left, when I realised that I didn't have enough wire to wind the other one (judging by the weight of wire left). Ferrite can actively absorb, dissipate or reflect induced noise in the cable, which is especially important in the construction of high-precision devices: small weight and dimensions of ferrite cores can be used without disrupting the layout of the equipment inside of complex devices or systems.I was winding inductors for my speakers. Also, the ferrite can be set certain properties at the stage of production, allowing in advance and with high accuracy to adapt the product to fit the needs of the particular device in which the ferrite will be used.
For this indicator, the ferrite exceeds even tonkolistovogo electrical steel. The advantage of ferrite over similar cores The low conductivity of the material avoids the formation of eddy currents during the magnetization reversal of the magnetic circuit. Advanced technology allows us to produce very complex structure of the product, the size of which sometimes is less than a tenth of a millimeter. To the layman, the most frequent ferrite rings and cylinders, which are used as filters noise in the communication cables: USB, HDMI, LAN, and others. Rod form ferrite products used in the manufacture of magnetic cores: for example, from ferrite cores perform for coils of high inductance. Types of ferrite cores For the winding of transformers release ferrites U-shaped and W-shaped. This phenomenon is most characteristic of switching networks of control devices, where even a shielded cable may be picking up interference, reducing the efficiency of signal transmission. Also the ferrite cores are used as the means of passive protection against high frequency electrical interference. Since ferrite has high magnetopause capacity and low conductivity, it is indispensable for the Assembly of low-power transformers including pulse. The use of ferrite cores The most widely ferrite cores are used in electrical and radio engineering.