Basic Audio is a free introductory textbook to the basics of audio physics and electronics.
The second type of shielding uses a different principle, but is also effective against magnetic fields. Outside the shield, the two fields are in the same direction and the combined magnetic field is increased. With input transformers, which are particularly susceptible to magnetic fields because they have a magnetic core, the shielding often consists of an arrangement combining magnetic and electromagnetic shielding into one composite assembly. Shipping charges noted in parentheses apply in addition to our standard shipping & service.
Oversized items scheduled for expedited delivery (Premium or Express) may incur additional shipping and services charges because of their unusual size.
Electromagnetic shielding does not use a magnetic material, but rather one that conducts electric current well, such as copper or aluminum.

As well as providing increased protection, the combination makes the arrangement more effective over the entire frequency range.
Unlike standard laptop trays that merely disperse heat, this lightweight stand's metal surface also blocks 99% of the Wi-Fi radiation given off by a laptop, mitigating what some medical researchers believe is a potential health risk. For complete shipping & service charges please call Customer Service at 1-800-321-1484.
When the magnetic field causing the induction fluctuates, it causes current to flow in the shield. Because it depends on fluctuating fields, this kind of shield is completely ineffective against steady magnetism. The magnetic shielding takes care of frequencies down to zero or d-c and begins to become ineffective at frequencies between 60 to 300 cycles.
Two quiet fans, powered by connecting the stand's retractable USB cord to a laptop's port, keep the computer cool while in use.

This current in the shield sets up its own magnetic field that opposes the original inducing magnetism, and the two fields tend to cancel inside the shield.
It is also comparatively ineffective against low-frequency fluctuation, and only becomes really effective at higher frequencies.
The electromagnetic shield^on the other hand, begins to become effective between 60 and 300 cycles, and the combined protection is effective for all frequencies.
The thick bottom padding cushions the stand against the user's thighs, while the ergonomic wedge design positions wrists at an angle for comfortable typing.
If this product ever disappoints you, for any reason, you may return your Hammacher Schlemmer purchase for exchange, credit, or refund.Should you have any questions, we are available 24 hours a day, seven days a week.

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