The mos tube is a metal-oxide-semiconductor field effect transistor, or a metal-insulator-semiconductor. The source and drain of the MOS tube can be reversed. They are all N-type regions formed in the P-type backgate. In most cases, the two zones are the same, even if the two ends are reversed, it will not affect the performance of the device. Such devices are considered to be symmetrical.
The bipolar transistor amplifies a small change in the current at the input and outputs a large current change at the output. The gain of a bipolar transistor is defined as the ratio of the output to the input current (beta). Another type of transistor, called a field effect transistor (FET), converts the change in input voltage into a change in output current. The gain of the FET is equal to its transconductance, defined as the ratio of the change in output current to the change in input voltage. Commonly available on the market are N-channel and P-channel, and the following are N-channel and P-channel symbols.
N-channel mos tube symbol
P-channel mos tube symbol
1) With a 10K file, there is a 15 volt battery. A turn-on voltage is available.
2) Because the gate is equivalent to the capacitor, it is easy to find the gate regardless of the N tube or the P tube, otherwise it is a bad tube.
3) Using the test pen to charge the gate source in the forward or reverse direction, the drain source can be turned on or off, and since the charge on the gate can be maintained, the above two steps can be divided into successive steps without synchronization and convenience. However, it is necessary to short-circuit the pins or reverse the charge when discharging.
4) There are anti-parallel diodes between the source and the drain. It should be noted and helpful.
5) When the majority of the villages are facing the word, the left source leaks from the right source.
The first three points above must be mastered, and the latter two points can be used flexibly.
If you are not sure about the newly acquired MOS tube, you can judge the foot by measurement. Only the accurate arrangement of the foot can be used correctly.
2, the method of measuring the pin:1Measurement of the gate G: Use the multimeter R&TImes; 100 files to measure the forward and reverse resistance between any two legs. If one of the measured resistances is hundreds of ohms, the two feet are D, S, and the third leg is G.
2 Drain D, source S and type determination: use multimeter R & TImes; 10kΩ file to measure D, S ask forward and reverse resistance, forward resistance is about 0.2 & TImes; 10kΩ, reverse resistance (5 ∞) X100kΩ. When the reverse resistance is measured, the red test pen does not move. After the black test lead is released from the pin, it touches the G, and then goes back to the original pin. Two cases occur:
a. If the reading changes from the original larger value to 0 (0&TImes; 10kΩ), the red test lead is connected to S and the black test lead is D. Contact with G with a black test pen is effective, so that the forward and reverse resistance values ​​of the MOS tube D and S are both 0 Ω, and the tube can also be proved to be N-channel.
b. If the reading is still a large value, the black test pen does not move, use the red test pen to touch G, and immediately return to the original foot after touching it. If the reading is 0Ω, the black pen is connected to the S pole and the red test pen is the D pole. It is effective to contact the G pole with a red test pen, and the MOS transistor is a P channel.
Type C Hub 8 In 1,Best Buy Usb C Hub,Usb C Hub For Macbook Pro,8 in 1 Type-C Multifunction Docking Station, 8 in 1 USB-C Multiport Docking Station
Shenzhen Konchang Electronic Technology Co.,Ltd , https://www.konchangs.com