Many people are now accustomed to answering phones and listening to songs with high-decibel headsets , but they do not know that this is actually damaging to hearing, and the United States research survey found that many Americans are gradually losing their hearing.
A recent survey conducted by the Department of Health of the City of New York, USA, found that a quarter of people who frequently listened to loud music between the ages of 18 and 44 had hearing problems. And, people who listen to headphones at high decibels are twice as likely to have hearing problems than those who often listen to headphones at low or medium volume. In addition, among 18- to 44-year-olds, the odds of wearing headphones to listen to music are more than three times higher than those over 45.
New York Health Commissioner Thomas Farrell said that long-term high-pitched stimulation can cause irreversible damage to the inner ear, leading to inflammation and hearing loss. When using headphones, the audio frequency should not exceed 60% of the maximum volume, and the continuous use time should not exceed one hour. When selecting headphones, try to choose earmuffs and earplugs. In addition, do not use headphones in noisy public places and public transportation.
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Two - way trigger diode, also known as two - end ac device (DIAC), and two - way thyristor at the same time.Because of its simple structure and low price, it is often used to trigger the bidirectional thyristor, and can also constitute overvoltage protection circuits.Construction, symbol and equivalent circuit of a bidirectional trigger diode.
Also commonly used in the overvoltage protection, timing, shift equal circuit, Figure 2 is the overvoltage protection circuit composed of bidirectional trigger diode and bidirectional thyristor.When the transient voltage exceeds the DIAC and Ubo, the DIAC quickly conducts and triggers the bidirectional thyristor to also conduct, so that the following load is protected from overvoltage damage.
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