This article describes a self-excited intermittent oscillation circuit diagram. The oscillating current is a current whose magnitude and direction change with the period. The circuit that can generate the oscillating current is called an oscillating circuit. The simplest oscillating circuit is called the LC loop. The oscillating current is an alternating current, which is a high-frequency alternating current. It cannot be generated by the rotation of a coil in a magnetic field and can only be generated by an oscillating circuit.
When the circuit is powered on, (t=to), the current flows through the primary flow of the transformer to the collector set, generating the induced voltage ui and the secondary sense u2 (u1 is up and down negative, u2 is down positive and negative) u2 makes ub And ui increased, causing "avalanche" positive feedback. 
Wi-Fi Internet access can be simply understood as wireless Internet access. Almost all smart phones, tablets and laptops support Wi-Fi Internet access, which is the most widely used wireless network transmission technology today. In fact, it is to convert the wired network signal into a wireless signal, just like the introduction to everyone at the beginning, use a wireless router for the relevant computers, mobile phones, tablets, etc. that support its technology to receive. If the mobile phone has Wi-Fi function, when there is Wi-Fi wireless signal, it can go online without going through the network of China Unicom, saving the data charge.
Wireless network wireless Internet access is more commonly used in big cities. Although the wireless communication quality transmitted by Wi-Fi technology is not very good, the data security performance is worse than Bluetooth, and the transmission quality needs to be improved, but the transmission speed is very fast, which can reach 54Mbps. Personal and social information needs. The main advantage of Wi-Fi is that it does not require wiring and can not be restricted by wiring conditions, so it is very suitable for the needs of mobile office users, and because the transmit signal power is less than 100mw, which is lower than the mobile phone transmit power, Wi-Fi Internet access is relatively It is also the safest and most healthy.
However, the Wi-Fi signal is also provided by the wired network, such as the ADSL at home, the broadband of the residential area, etc. As long as a wireless router is connected, the wired signal can be converted into a Wi-Fi signal. Many cities in developed countries abroad are covered with Wi-Fi signals provided by the government or large companies for residents to use. There are also many places in my country that implement "wireless city" projects to promote this technology. In pilot cities where 4G licenses have not been issued, many places use 4G to Wi-Fi for citizens to try.
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