An equally important reason was that main memories were quite slow ( a common type was ferrite core memory ); by using dense information packing, one could reduce the frequency with which the CPU had to access this slow resource.
42.
The ferrite cores used for signals have a range of applications from 1 kHz to many MHz, perhaps as much as 300 MHz, and have found their main application in electronics, such as in AM Radios and RFID tags.
43.
Some modern crystal sets use a ferrite core tuning coil, in which a ferrite magnetic core is moved into and out of the coil, thereby varying the inductance by changing the magnetic permeability ( this eliminated the less reliable mechanical contact ).
44.
ADT4316 ( 1976 ) had 16K words of ferrite core memory, the ADT4500 ( 1978 ) up to 4M words of semiconductor RAM . The ADT 4900 was designed as a single-board computer, but its mass production did not start.
45.
You start to get more of a problem as you come down the spectrum to lower VHF and MW but you still might be able to avoid a messy insertion into a leg bone by using fine guage copper wire wound on a ferrite core.
46.
The ferrite cores used for power transformers work in the low frequency range ( 1 to 200 kHz usually ) and are fairly large in size, can be toroidal, shell, or shaped like the letters C, D, or E.
47.
Since the magnetic permeability of the ferrite is hundreds or thousands of times higher than that of the surrounding air or glass, and the ferrite core provides a closed path for the magnetic field, virtually all of the magnetic field is contained inside the ferrite core.
48.
Since the magnetic permeability of the ferrite is hundreds or thousands of times higher than that of the surrounding air or glass, and the ferrite core provides a closed path for the magnetic field, virtually all of the magnetic field is contained inside the ferrite core.
49.
The discharge tube forms one such closed path around the ferrite core, and in that manner the time varying magnetic field in the core generates a time varying electric field in the discharge tube, There is no need for the magnetic field to penetrate the discharge tube.
50.
This technique is equally valid for coaxial interconnects, and many camcorders have ferrite cores fitted to some of their auxiliary cables such as DC charging and external audio input, to break the high frequency current flow if the user inadvertently creates a ground loop when connecting external equipment.
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