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.
DO-35,DIACS,DO-35 Diode,DO-35 package,Small Signal Diode Changzhou Changyuan Electronic Co., Ltd. , https://www.cydiode.com
Some people say that the millet TV host is a TV box with audio, so-called "millet TV 3" is a TV box + 55 inches or 60 inches large screen. If you think so, then it's at least half wrong. Reading the lead of “Millet TV 3†is the MiPort interface. Imagine TV box with HDMI. Why should Xiaomi develop a dedicated interface?
We used seven small questions to uncover the secrets of Xiaomi TV 3 and Xiaomi TV host:
First, the host of the millet TV 3 is not the "millet TV host" 
It sounds like a tongue twister. I believe most people think that the host of Xiaomi TV 3 is 999 yuan "millet TV host", a device that can connect other brands of television. However, this is not the case. Xiaomi TV 3 is equipped with a special version of the host. Compared to the host computer sold separately, the power interface is removed and power must be supplied through the proprietary MiPort interface.
This only difference determines that the host of Xiaomi TV 3 cannot connect other TVs. What exactly does the magic MiPort interface do?
Second, MiPort not only saves a line 
The host of Xiaomi TV 3 needs to supply power and output video signals. Xiaomi uses the interface of MiPort to convert the two lines of work into a single line. The millet TV host sold alone has no such treatment. The root line, the power supply is the power supply, and the other end of the MiPort becomes the HDMI interface.
The role of the MiPort interface on the Millet TV 3 is at least two: First, the power supply and the video output are combined in one, eliminating one line; secondly, the control signal can be transmitted. Can't use the same remote control for common TV boxes and TVs? Millet TV 3 can.
Not to mention, one-click songs like this.
Third, "I just want to listen to music" 
We can turn on the TV, find the "Internet Radio" app, and select the "Closed Screen Listening" feature, which is what many TVs have. However, on Xiaomi TV 3, it is also possible not to turn on the power. Press the "PLAY" button on the audio, the music will come naturally. The control buttons on the audio include volume increase/decrease, up/down track, and switch channel. It is enough to control Xiaomi's own "Douban Radio".
This is how Millet TV 3 is used as a smart speaker. But in reality, there is no such thing as not playing music on the phone. The realization logic of the millet TV 3 is that when you press the “PLAY†button while the computer is turned off, the system will turn on the phone, and then you can turn on “Internet Radio†to play the music, but the screen does not light up. When you listen to the song, press the power button again, the screen will be on, and the truth will be bright.
This is equivalent to improving the "closed screen song" experience. When Millet TV 3 listens to songs on the screen, the control buttons on the remote control and the audio cannot be cut and paused. Only the volume can be adjusted, but the “CH†button on the audio can switch channels. Note: There is also a Music Control App for Millet TV 3, which is currently under development and has not yet officially launched.
Fourth, the remote control of small changes 
In the past, Xiaomi’s remote control was powered by a button battery. The new version was changed to two 7-cell batteries, and the thickness was significantly increased. Because the curvature of the back was increased, the grip was actually more comfortable. With the Bluetooth 4.1 protocol, its pairing with the TV is automatic, eliminating the need to press the two keys to enter the pairing mode as before.
Millet TV 3 comes standard with an ordinary Bluetooth remote control. Another 99 yuan can be purchased with a new remote control with voice and somatosensory, both voice search for video programs, but also can play some somatosensory video games.
Fifth, the appearance changes little 
Millet TV 3 has a textured effect on the metal frame. Some people like this rich feeling. Some people prefer the pure feeling before. Vary from person to person. This is almost the most visible change in the visual appearance of the millet TV3.
The back is more concise because all interfaces are transferred to the host, leaving only the power supply and MiPort. But do not expect it to be completely flat, although the host and audio module is not, but the display itself still needs the circuit board and driver board, so the structure does not change much, but the thickest place is thinner than the millet TV 2S about 1 cm.
Millet TV 3 is currently available in 55-inch and 60-inch models.
Sixth, the performance did not change 
Compared with Xiaomi TV 2S released three months ago, Xiaomi TV 3 has the same configuration of CPU/GPU and storage computing modules. From the parameter list, the change that can be seen is the Bluetooth 4.0 upgrade to Bluetooth 4.1.
Compared with mobile phones, the mainstream TV chip update speed is not so fast.
VII. Many contents, but also miscellaneous 
The new TV version of the MIUI system has added several video portals on the front page (previously only "online video" one) and can directly enter movies, TV dramas, anime and variety categories, or watch "video news" directly or through "View History" continues to watch programs that have not been watched before. This shows that Xiaomi is strengthening its own video content operations.
Judging from the absolute number, Xiaomi TV has integrated the contents of four Internet TV licensees and is undoubtedly the leading one. However, each family has its own account system. If you want to see all paid content, you need to buy multiple VIP accounts. How to better integrate and operate these contents is still a severe test for Xiaomi. It is worth mentioning that the MIUI TV version based on Android's depth customization on Xiaomi TV 3 has a better openness, so users can expand their own needs by downloading a third-party APP market, such as a sofa butler. Content.
to sum up 
There is a point of view that it is not a good idea for Xiaomi to put the host and the sound together. Because the sound is a very slow upgrade product, the host is the opposite, put the two devices together, the future upgrade host, but also to replace the audio, it seems a bit wasteful. From this perspective, it is not unreasonable, but I believe Wang Chuan has his own considerations and trade-offs.
In order to do "split TV" instead of the "box + TV" one would imagine, Xiaomi must develop the MiPort interface to ensure that Xiaomi TV 3's experience exceeds the 999 yuan Xiaomi TV host + other brand big TVs. This is unexpected, and it is also a matter of reason. In the tiny MiPort interface, the secret of Millet TV 3 is almost hidden.
Millet TV 3 experience evaluation: secret all in the MiPort interface
Has been waiting for Wang Chuan's big move, always feel that Xiaomi is doing the same with the mobile phone, will certainly throw a few nuclear bombs into the industry. Millet TV was the fourth generation, split TV, Wang Chuan finally came up with strategic weapons. It's not hard to think of separating the screen from the host, but putting the host and Soundbar together is the way Millet bets on the future TV format.