Apple's cancellation of the 3.5mm headphone jack had caused an uproar that had triggered a joint petition and hoped that Apple would rejoin the interface. However, these attempts seem to be in vain. The news that the iPhone 7 does not have a 3.5mm headphone jack. This is also a questionable voice on the Internet, after all, the 3.5mm headphone jack standard has existed for many years. However, some people initiated investigations. Among the thousands of netizens participating in the survey, 36% said they would give up mobile phones without this interface, because the vast majority of these people have good headphones. Surprisingly, 38% said that as long as the phone is easy enough to use, it will be considered. In fact, the cancellation of the headset interface is not the first time, when the OPPO R5 is known for its ultra-slim phone, there is no headphone jack. Due to the development and maturity of Bluetooth technology, more and more Bluetooth headsets provide the same excellent sound quality. So the 3.5mm headphone jack is not that necessary, but it takes a long time to fully replace it. Can you accept a phone without a 3.5mm headphone jack? This article from the Tencent News client from the media does not represent Tencent News's views and positions.
Applications:
The
use of a K-rated transformer is anywhere non-linear loads are present. Prime
uses would be in factory automation, computer rooms, and office buildings
because of the high harmonic content in these areas, Typically a K-13 rated
transformer is sufficient for most applications. UL recognizes K-factor
values of 4, 9, 13, 20, 30, 40 and 50. The K-factor number tells us how
much a transformer must be de-rated to handle a definite non-linear load or,
conversely, how much it must be oversized to handle the same load.
How to choose your K
factor transformer?
K1: standard
transformers, standard lighting, motors.
K4:
Induction heater, SCR, AC drive
K13: School
pulse lighting, hospital
K20:
Data processing computer, computer room.
Or
send your requirement to SCOTECH!
Why SCOTECH
Long
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Technical
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Manufacturing-advanced
production and testing equipment, strict QA system.
Perfect
service-The complete customer service package (from quotation to energization).
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