Multi range timer 5A

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Multi range timer 5A

Q: For example, I hope that at some time the computer is unable to boot, unless there is an administrator password. Or at a certain point in time to shut down, is mandatory. How to operate, or what software to download? Please heroes pointing to help!: Ah can be specific to the Internet check

Q: 35KV switch cabinet sub-closing standard time is how much: Large range of speaking, closing time is less than or equal to 100ms sub-gate time is less than or equal to 80ms.

Q: Mobile phone every time switch, the time has changed, how will not save, you save the time?: if you still can not remember the time, then you must be fast for the battery speed, in 1-2 seconds must win, it will save the original time

Q: The most common switching circuit Ton-turn-on time open Toff-turn-off time off Ts-storage time Tf-fall time Tr-rise time Td-delay time: Transistor in the switch circuit in the open and closed, due to the existence of barrier voltage, will produce a certain time delay. Storage, rise, fall mainly produce some cross-distortion, so that the circuit load of electricity becomes unstable ... ...

Q: Even want to use two mechanical relays after interlocking control of two-way thyristor and then control the motor is reversing, do not know the delay time enough?: Have to use single-chip or ARM, the computer through the serial port to send instructions to the microcontroller, single-chip output control voltage, making the relay opening and closing, and then use the relay control you need mechanical switch. So, you want to buy the equipment is: development board

Q: The living room 1.5 air conditioning to open a period of time on the trip (before about an hour or so jump, air conditioning master today to check the air conditioning, air conditioning no problem, help me after cleaning, opened four hours or tripped. Really depressed: Do not know how to fix it? (2 rooms in an air conditioning together to start the night will not jump, are separate routes): Air conditioning boot on the user is the most common problem of low voltage drive is not up, because noon, the evening is the peak power, resulting in voltage drop, of course, the current rise, so the air conditioning will start a mediation. Air conditioning boot on the investigation method: First, to ensure that the voltage is normal, for a new leakage switch, if not yet, then, there is a short circuit of air conditioning, and to carefully check the. Second, first check the leakage protector is normal, and then check whether the air conditioner leakage.

Q: The diode is a switching element, and its switching time includes what and what: The general reverse recovery time is greater than the opening time, so the use of switching diodes on the parameters only gives the reverse recovery time. Switching diode switching speed is quite fast, like silicon switching diode reverse recovery time only a few nanoseconds, even germanium switching diodes, but also a few hundred nanoseconds.

Q: How to use the microcontroller switch to control the length of the circuit section time: SCM to be programmed, compiled after the burn into the implementation of single-chip, not two or three words can understand. If you control the circuit off time is fixed, you can buy a "refrigerator companion" to use, very cheap.

Q: Low-power flyback switching power supply, start-up resistance 560K, start capacitor 22uF, I would like to ask the power after charging the capacitor to 12V how much time how to calculate: U = U [1-e ^ -t / (RC)] => 12 = 300V [1-e ^ -t / (560000 * 0.000022)] => 12 = 300V [1-e ^ 2.2) Solve t can be. Calculation of Capacitance Charging Time

Q: Time timer switch time timer switch: The earliest use of the timing tool is hourglass or water leakage, but after the birth of the watch mature, people began to try to use this new timing tool to improve the timer, to achieve the purpose of accurate control of time. In 1876, the British surgeon Sauer acquired a patent for a timing device to control the switch of the gas street lights. It uses the mechanical clock to drive the switch to control the gas valve. At first the last week of the winding, 1918 years after the use of electricity clock, you do not have a winding.

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