discount 70% in 2018-07-21 to 2018-07-23
price: USD$ 14.06
freight :USD$7.00,(Postal parcel)
Search Similar or mail to saler or send message to saler
Ferrite ring is a commonly used anti-interference component in electronic circuit. It has a good inhibitory effect on high frequency noise, and is usually made of ferrite material (Mn - Zn).
The magnetic ring has different impedance characteristics at different frequencies, and the impedance is very small at low frequencies. When the signal frequency increases, the impedance of the magnetic ring rises sharply.
As we all know, the higher the frequency, the more easily radiated (to buy computer chassis quality but also to reduce the electromagnetic leakage), and the signal line is generally not shielded, so the signal line becomes the antenna good, receiving the high frequency signal clutter in the surrounding environment, and these signals was superimposed on the signal transmission, the signal will even change the original transmission. Then, under the action of magnetic ring, the normal useful signal is well passed, and it can also restrain the passing of the high frequency interference signal, and the cost is low.
So it's not surprising that you see a plastic knot like magnetic ring in the monitor signal line, the USB connection line, and even the high-end keyboard and mouse.
Turn number selection of magnetic ring
The whole cable passes through an ferrite ring and forms a common mode choke. According to the requirement, the cable can be wrapped around a few turns on the magnetic ring. The more the number of turns, the better the interference suppression effect on the lower frequency, while the higher frequency noise suppression is weaker. In practical engineering, the number of turns of the magnetic ring should be adjusted according to the frequency characteristics of the interference current. Usually, when the frequency band of the interference signal is wider, two magnetic rings can be sheathed on the cable, and each magnetic ring is surrounded by different turns, which can restrain the high frequency interference and the low frequency interference. From the mechanism of the common mode choke, the greater the impedance, the more obvious the interference suppression effect. The impedance of the common mode choke comes from the common mode inductance Lcm=jwLcm, and it is not difficult to see from the formula that for a certain frequency noise, the greater the inductance of the ring, the better. But the actual situation is not so, because there is parasitic capacitance on the actual magnetic ring, the existence of it is parallel with inductance. When the high frequency interference signal when the capacitor capacitance is smaller, the magnetic inductor short, so that the common mode choke out.
Buyers must read:
1Before buying, please read the baby carefully, because the baby is sold with the entity store synchronously, so the stock flow is very fast. If the stock is out of stock after purchase, we will promptly notify and replenish the goods as soon as possible!!! Contact us as soon as possible, so as not to appear you are very anxious to affect the pro production!
2About receipt: because of the particularity of online shopping, goods need to be transmitted through the third party logistics. So please Pro must face to face inventory receipt, if there is damage, please reject, and immediately contact the seller, such as the pro did not face to face inspection or to the gatekeeper, other people to collect, once signed, that goods arrived in good hands. If there is a case, the carrier is not liable, so we can not recover the loss for the parents.Non quality problems, remember not to receive goods, a week and a half months to contact us, say goods have problems or broken, and so on, we will not bear to accept the receipt of parents must have problems, contact us within 2 days, we will communicate with you
All the commodity data in this shop are taken in kind, without light, without modification. Pictures are taken in kind, because of the external light and camera focal factors, objects and pictures may be different, is a normal phenomenon, pictures only for reference, please object in kind.The company has a large inventory, price concessions! Welcome parents need to contact us!!!The baby is constantly increasing, such as other models, welcome to call for advice and quotation service.Large amount of contact with our customers, there is a discountBecause our shop at the same time shipped, resulting in goods have been sold and other circumstances, such as after the purchase of out of stock, we will promptly notify and as soon as possible replenishment, please parents understanding!!!Magnetic core and magnetic ring are fragile, packaging is slow, many varieties, the day is not urgent packaging2If you have any other problems and circumstances, please contact me in time!