What is the nature of the wiring pool?
The so-called wiring pool is essentially a switch matrix. The connection between the input and output items of different MCs can be completed by knotting.
What two parts do the magnetic fluxes passing through the core section consist of?
- The magnetic flux generated by the coil L is west.
- The magnetic flux M generated by the permanent magnet is in the magnetic flux passing through the cross-section of the magnetic core. Consistent with the west M direction. Since the cross-sectional area of the magnetic core is small, the magnetic core is in a saturated state after there is a large magnetic flux. When the magnetic core is saturated, the inductance of the coil L will decrease. By adjusting the position (direction) of the small permanent magnet, the size of the cross section through the magnetic core can be changed. That is, the size of the pre-applied magnetic flux to the magnetic core can be changed.
What is a combiner?
The main function of the combiner is to combine several signals of different frequency bands into one room division system.
That is to say, an indoor distribution system can serve several wireless systems working in different frequency bands through a combiner. For example, in actual projects, it is necessary to combine 800 MHz CDMA and 900 MHz GSM, or to combine 900 MHz GSM and 2000 MHz 3G.
How many sensors are used for exhaust gas purification?
- Oxygen sensor
- Exhaust gas recirculation displacement sensor
- Pressure base sensor
- NOx sensor
- Exhaust gas temperature sensor
Which roles do you need to define for devices that implement common attribute specifications?
Client: initiates commands and requests to the server, and receives responses, instructions, and notifications from the server.
Server: Receives commands and requests from clients, and sends responses, instructions and notifications to clients.
What are the types of AC adapters running?
- Full-load operation
- No-load operation
What is the multiply/divide instruction?
MUL is an unsigned multiplication instruction, and an 8-bit signed multiplier is placed in each of the registers X and A.
After execution, the upper 8 bits of the 16-bit product are in X, and the lower 8 bits are in A. At the same time, the H and C flag bits in the CCR register are set to zero, and other flag bits are not affected.
DIV is an unsigned number division instruction. The high and low 8 bits of the l6-bit dividend are placed in the H and A registers respectively, and the divisor is placed in the X register.
After execution, the business is put into A, and the remainder is put into H, which affects the Z and C flag bits in the CCR register, and does not affect other flag bits.
What kinds of wireless communication technology can be divided into?
Wireless personal area network, wireless local area network, wireless wide area network.
What are the main aspects of the FID standard system?
Technical standards, data content standards, performance standards, application standards.
What is a power MOSFET?
We all know how to use diodes to implement switches. However, we can only switch it on and off, not gradually control the signal flow. Also, diodes act as switches depending on the direction of signal flow. We cannot program it to pass or mask a signal.
For applications such as “flow control” or programmable switches, we need a three-terminal device and a bipolar transistor. We’ve all heard of Bardeen & Brattain, who invented the triode by accident, like many other great discoveries.
Structurally, it is implemented by two back-to-back junctions (not a big deal, we probably implemented the common cathode with the same structure long before Bardeen). However, functionally it is a completely different device, like a “faucet” that controls the flow of emitter current – the “hand” that operates the faucet is the base current.
Bipolar transistors are therefore current-controlled devices. Field Effect Transistors (FETs) although structurally different. However, the same “faucet” functionality is provided. The difference is: FETs are voltage controlled devices. You don’t need base current, you implement current control with voltage.
The bipolar transistor was born in 1947, not long after the brilliant father and son Shockley and Pearson invented (at least in concept) the FET. To distinguish it from the earlier bipolar “twins”, the three electrodes of a FET are called drain, gate, and source. The three electrodes of the corresponding triode are the collector, the base and the emitter, respectively.
There are two main variants of FETs, which are optimized for different types of applications.
JFETs (junction FETs) are used for small signal processing.
Whereas, MOSFETs (Metal Oxide Semiconductor FETs) are mainly used in linear or switching power supply applications.
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