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ferrites and coils

A

Anonymous

Guest
Eric, have you done much testing with using ferrite cores in your coils? From what I understand (and from my testing) inserting a ferrite core into a coil increases the inductance of the coil dramatically, but I wonder what it does to the field of the coil.
 
Eric, Do you wind the coils toroidally? What do you use for a Faraday shield? Dave. * * *
 
Hi Dave,
Winding is just a straight solenoid type. Either 10/0.1mm pvc insulated or 1/0.25 wirewrap wire. I use lead foil for shielding grounded to coil ground.
Eric.
 
Hi Eric,
can you please tell us, which ferrite form gives best results? - does it a long or short cilinder (and which D/L ratio is best), or a E-form from power transformer, or perhaps U-form?
thanks
Walter
 
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