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specified maximum time. The MOSFET manufacturer uses the chart shown in 3 to mark this range, or the security workspace (SOA).Figure 3 MOSFET SOA diagramThe SOA diagram shows the relationship between drain source voltage, drain current, and the duration of the MOSFET's ability to withstand this power dissipation. For example, the MOSFET in Figure 3 can withstand 1 ms at a time of ten V and 850 W, and if this condition lasts longer, the MOSFET may be damaged. The timer circuit uses an external t

Article excerpt from: http://bbs.21ic.com/forum.php?mod=viewthreadtid=279798fromuid=8352181.introduction of main parameters of stepping motorPhase Number: The phase number of the stepper motor refers to the number of coils. There are two-phase, three-phase, four-phase, five-phase respectively. Passconstant condition, high phase number, small step angle and high precision. rated current: The current size of the motor during normal operation. Step Angle

Simple Calculation of electric vehicle performance indicators: The following are several calculation formulas. Formula 1:V = P/(g x 0. 09)(V: fastest speed P: rated power G: total load weight)(The higher the power, the faster the speed) Formula 2:I = P/u(P: rated power U: battery voltage I: current) Formula 3:T = Q/I(Q: Battery capacity I: cycling current) Formula 4:S = vt(S: remaining mileage V:

...... This is the direct operation from the UI to the dB, and there is no abstract level. Such a design has limited adaptability to changes in requirements. Demand changes often occur during software development and maintenance, and demand changes are often at different abstraction levels. For example, a monitoring system for equipment manages various electrical equipment, such as motors, transformers, and compressors. The user puts forward the following requirements: 1. Each time the devi

Select an appropriate type Select the most appropriate type of water heater Based on the household water consumption, and consider its internal structure. According to the internal structure, the electric water heater is divided into three types: Water Box, open outlet and closed outlet. Among them, the water tank without liner, poor thermal insulation performance, the amount of water is also small; the outlet open type with tap water pressure continuous supply of hot water, water temperature

frequency speed control of cooling water is also the goal of saving energy. When the system's demand for chilled water decreases, the demand for cooling water will be reduced accordingly. This load change reflected in the cooling water, its performance is the condenser outlet temperature than the rated value, cooling tower water temperature is low, can reduce the number of cooling tower running fan, at the same time can also reduce the cooling water

practices, research shows that they do not have any benefit in addition to helping read the text. Some studies may even show that the focus may affect the learning process, because the focus will make people turn to the fact that each is independent, it may prevent learners from clarifying the relationship between facts and making inferences. Another learning strategy that is similar to the focus is re-reading, which is also a common practice, which is less efficient than other good strategies.

nominal according to the impedance generated at a certain frequency, the impedance unit is also ohm. generally, 100mhz is used as the standard. For example, 2012b601 indicates that the impedance of the magnetic beads is 600 ohm at 100mhz.Rated current: The rated current is used to ensure that the circuit works normally. 3 difference between inductance and magnetic beads:More than one turn of the coil is used to be called the Inductance Coil, less tha

power filter, used for signal line is HB series; 1 indicates that a component encapsulates a magnetic bead. If it is 4, it encapsulates four beads side by side; H indicates the composition of the substance. h, C, and m are used for intermediate frequency applications (50-200 MHz ), T low frequency applications (50 MHz), s high frequency applications (200 MHz ); 3216 encapsulation size, length 3.2mm, width 1.6mm, that is, 1206 encapsulation; 500 impedance (generally MHz), 50 ohm. There are three

simply add the d= parameter to the picture request and set the parameter value to the following values: 404: Do not load any avatar. Returns a 404 response if the e-mail address hash value does not have a corresponding image (file not found) MM: Simple, cartoon-style character silhouette (does not change with the mailbox hash value). Identicon: A geometric pattern whose shape changes with the e-mail hash value. Monsterid: The program-generated "monsters" avatar, colors and faces will vary

in array A, and the 1th element is the subscript of the 1th axis, so the values of b2[0,0], b[0,2], and b2[1,0] are not 0 from the following results:##>>> b2 = Np.array ([[True, False, True], [True, False, false]])#>>> Np.nonzero (B2)#(Array ([0, 0, 1], Dtype=int64), array ([0, 2, 0], Dtype=int64)) ifLen (unrateditems) ==0:return 'You rated everything' #A list of projected scores for a non-rated i

, which is the most severe shrinkage? If you have a high school math relationship, then you will feel that the third paragraph is more severe, the first to second paragraph does not shrink. 270uF 400V Capacitor, up to no more than 450W rated power for good High-end power supply employs two main capacitors, up to 270uF In fact, in the market sales of these three power supply, the price is actually similar. This is the recessi

which good system security rating At present, the domestic security software is popular for operating system security rating operation, scoring implementation hundred of course is the higher the better, basically from these aspects (operating system has been found in the current high-risk vulnerabilities, there are no risk files, there are no malicious plug-ins, the recent virus Trojan scan, there are no anti-virus software installed) To make a comprehensive score, then take a look at the secu