Q:What is the difference between regulated power supply and steady current power supply?

Steady current power supply can be constant current output, regardless of voltage. In the rated power, 1V voltage can output 10A, 10V voltage can also output 10A. Now the adjustable power supply is almost stable, steady flow.

Q:It was strange to see a regulated power supply consisting of the op amp LM308A and the PNP transistor 2N2905. The output of the op amp does not return to the base of the transistor as usual, but returns directly to the inverting input of the op amp. The base of the transistor is connected to the positive voltage input of the op amp, connected by a resistor and the positive pole of the power supply. Do not know the working principle of the circuit, the role of the transistor, the output voltage regulator is how to adjust, do not know where the source of the circuit? I hope you experts advise!

I was the first time I saw this structure, I understand this: LM338 - 5.0 is a precision 5V voltage reference, the dynamic internal resistance is very low, the typical value is 0.6Ω, op amp LM308 is the emitter follower connection, 2,3,6 feet equal, that is, V2 = V3 = V6 = 5V, Rs and triodes constitute a parallel regulator circuit, and the op amp is the controller. Vin ↑, V3 ↑, V6 ↑, Io ↑ (op amp output current), I7 ↑ (op amp supply current), Ie ↑, URs ↑, Uout ↓.

Q:What is the DC power supply load characteristics of the curve, how to determine, good and bad What is the performance, if not good, how to improve it, please advise people

DC load power supply load curve, that is, the relationship between the output voltage and load resistance curve (the greater the resistance the higher the output voltage), is determined by the output power of the power supply itself. On the improvement that depends on what you do the circuit, and now the more popular is the switching power supply, is to control the duty cycle, the first output square wave, and then after the filter circuit. If you want to have a voltage regulator circuit, the feedback circuit is based on the load to adjust the power duty cycle.

Q:From the old computer to remove a switch power supply can do what, can be used when the power? how to use?

Yes, the main power is enough power. Voltage and current are appropriate.

Q:What is the difference between a constant voltage source and a regulated source, or what is the difference between a constant current source and a steady flow source? What is the DC What is the exchange (to be clearly defined)

Constant voltage source: fixed output of a constant voltage regulator source: no rounds of working current how to change the end of the output can be a fixed voltage (within the rated current range) DC: current flow in one direction AC: current direction cyclical changes flow

Q:Members help me to explain the role of the various components in detail. The There D5 regulator is 21V why the output is 20V, they said to reduce the UBE0.7V pressure drop. I do not understand, why should subtract UBE ah? The more detailed the higher probability of adoption. The Remember the details. The The Thank you all the teachers. The ? Mainly three-tier tube is how to complete the regulator?

This is the standard series regulator circuit, but the transistor is not regulated, it is only used as a regulator tube, used to adjust the voltage. Circuit connected, A point voltage through the resistor R1 into the regulator D5, as long as the working range, the regulator will be stable at 21V; In fact, each regulator will have errors, the specific choice of the regulator can be found on its DATASHEET this error; Output to the voltage on the C3, that is, the voltage regulator tube to reduce the VT BE junction voltage (if it is silicon tube, is about 0.7V); Obviously, the difference between the input voltage at point A and the output voltage on C3 is added between the CE poles of the transistor. Whether the output current changes or input voltage changes, the regulator will be through the regulation of the transistor BE to complete the transistor CE to withstand the voltage to adjust to achieve the purpose of stabilizing the output voltage.

Q:What is the meaning of the regulator accuracy?

Regulator accuracy refers to the output voltage fluctuation range is smaller, the higher the accuracy, such as electricity is very unstable, about what low, high precision regulator can be controlled within a safe range, like the computer this Precious equipment requires high precision.

Q:DC power supply is linear or switch

DC power supply with a linear power supply, but also switching power supply.

Q:What is the role of power supply regulator?

Of course, is to play the role of regulation ah, that is, we usually use the electrical instability, fluctuating too much when the crash is easy, power supply is to play the role of not let him crash

Q:Please elaborate on their function, where to use, what is the difference between the output input? The more detailed the better! Thank you!

DC power supply is a direct current, in the oscilloscope showed a linear waveform, used in the requirements of the DC voltage and current circuit AC power supply output is AC, oscilloscope on the sine wave, used in the requirements of constant voltage, and a certain frequency of the circuit. Your question is not very clear, I can only ask you to ask so much