Q:AC purification power supply buzz sound is great what is the situation

The reason why the clamp is loose may not be fastened during assembly, or it may be due to loosening of the screw of the clamping member after prolonged use.

Q:DC power supply through what way to achieve the purpose of regulation

The other is a switching power supply, generally isolated and not isolated, they use a variety of voltage regulator, the common output voltage is sampled through the feedback circuit to control the pulse width of the switch to stabilize (PWM), there are Special way of using FM (resonant).

Q:Use multimeter and DC power supply should pay attention to what matters

Multimeter is worth noting that the resistance file can not be no measurement voltage, pay attention to range. DC power output can not be short-circuited

Q:Ultra-low voltage automatic power supply how to use

Answer: how much power is your load ah! Is there you sure that your regulator is not wrong? Just bought no see no problems, is it Asked: is a computer `` `nothing else` `` `` `` `` `` `` `` `` `` `` `` `` `` `` `` `` `` `` `` `` `` `` `` `` `` `` `` `` `` `` `` `` `` `` `` `` `` `` `` `` `` `` `` `` `` `` `` `` `` `` `` `` `` `` `` `` `` `` `` `` You can generally know that the regulator is not a problem

Q:In the use and installation of the regulator, what should be noted

While the regulator to use and install, we should note the areas in which the following by the Westinghouse simply tell your face :( a) in contact with the regulator to ensure enough space to avoid running occurs when heat case; (b) put the regulator on the power distribution panel, choose the appropriate fuse, so as to ensure safe use of electricity; (c) either regulator, in Plug in all of the input and output lines Thereafter, the switch must first close and then open, the output voltage is normal after checking to ensure that, in order to re-open; (iv) the power output of the access surface of the electrical equipment, appliances to be noted that the value and the nominal value input of the regulator are the same, absolutely can not go wrong; (e) Remember that regulators are not overloaded used; when (six) have elected to use electrical equipment air conditioning, refrigerators have the motor running, you should select more than three times the capacity of regulators , to avoid the device starts regulator current exceeds the overcurrent protection fuse or circuit breaker current causes the current regulator is a blown fuse or trip a circuit breaker, or because of pressure drop Large and unable to work; (vii) after the regulator installed, first open the switching power supply, if the indicator lights work, then we first look at the indicated value of voltmeter is normal. Output voltage is normal, and then open the power supply power switch, the regulator can automatically adjust the voltage, the normal power supply. Westinghouse electrical professional regulator manufacturers, production voltage regulator, AC voltage regulator, CNC regulator, and so the power supply, the model is complete, welcome to buy!

Q:Maintenance of mobile phone power supply is best used to what

The use of transformer power supply, ripple is relatively small, ripple small noise, because the communication equipment, high noise requirements.

Q:I would like to ask: DC power supply when the ground terminal when used? how to use?

Question 1: If the power supply is three-core, the terminal can be connected to the buried pillars above, if there is no copper pillars, vacant Question 2: I have not used two of the two. If it is connected, personally think that one can be. Specifically you can confirm whether the two terminals are directly connected, and the equipment manual recommended connection. In some control accuracy requirements of relatively high occasions, requiring a public ground, or independent grounding, etc., which can reduce crosstalk, interference, etc., specifically see how the requirements of the book ok.

Q:Switching power supply with load capacity difference is what reason. My switching power supply output is 2A-24v. The output is not connected to the output is 24v. Connected to the 24v -5w lamp only 2v voltage. Even the switch power indicator light is not bright. What 's the matter?

The biggest possibility is that the output capacitor is bad, deteriorated. As the switching power supply for a long time to work fever, so that the capacitor electrolyte dry, so the capacity decline, ESR (equivalent resistance) rise, simply say that its filter capacity decreased, so it can not be properly loaded, the use of low ESR specifications After the capacitor can be replaced. But must be low ESR, otherwise the switching power supply because of high frequency, high ESR of the ordinary capacitor may be due to serious fever burst.

Q:It is required to output 0-250V continuously adjustable AC voltage in the case of mains input fluctuation. The load is only one coil of 800 ohms, so the power consumption is very small. What are the recommended models? how's the price?

Variable frequency power supply is rectified filter, and then inverter, get adjustable voltage.

Q:Can DC power supply be used as a charger for lithium batteries?

Diode is the role of polarity protection, many appliances are equipped with this component. Answer your charger problem. In principle, your DC power supply can charge your charger. Adjust to the corresponding voltage can be. But there are problems you are hard to know: how much charging current? How much charging time is required? If you do not know this, will soon put your electrical equipment filled with bad. If you understand power, will measure its charge current, it is very simple. You can use 10 times the rate of charge, you can also use 5 times the rate of charge. Summary of my conclusions: 1, if you understand the electricity, you can use its charge. 2, if you do not understand the electricity, it is recommended not to use, or your battery inside the battery is easy to be filled with bad.