conduction earphones

rectifier power supply generally has four parts, see Figure 1. wherein the transformer circuit is actually an iron core transformer, need to introduce is only the back three kinds of unit circuit.Second, rectifier circuitA rectifier circuit is a circuit that uses the unidirectional conductivity of a semiconductor diode to turn alternating current into a unidirectional pulsating DC power.(1) Half-wave rectificationA half-wave rectifier circuit requires only one diode, as shown in Figure 2 (a). I

1. Power Electronic DevicesThe power electronic device can be divided into the following three categories according to its control of conduction and turn-off controllability.1. An uncontrolled device, which is a device that cannot be controlled by conduction and shut-off. Rectifier diodes only are non-controllable devices.2. Semi-controlled device, which can only control its

This article has three parts: CPU Main power supply circuit composition, CPU single-phase power supply circuit Working principle (take HIP6021 power IC as an example), the CPU single-phase power supply Circuit maintenance flow detailed explanation. Thank the Shenzhen Red Police computer maintenance Training School to provide technical information to support this article. General composition of power supply circuit CPU main power supply is an important condition of CPU work, mostly by power sup

One, push-pull output: Can output high, low level, connect digital devices; push-pull structure generally refers to two transistors are controlled by two complementary signals, always in one transistor on the time of the other cutoff. The high and low levels are determined by the IC's power supply. Push-Pull circuit is two parameters of the same transistor or MOSFET, to push-pull mode exists in the circuit, each responsible for positive and negative half-cycle of the waveform amplification task,

normally, but there are two diode conduction, the power consumption is figure 1 twice timesMOS tube Type anti-reverse protection circuitFigure 3 Using the MOS tube switching characteristics, control circuit on and off to design anti-reverse protection circuit, due to the low internal resistance of the Power MOS tube, now MOSFET Rds (on) has been able to achieve a non-European level, It solves the problem that the voltage drop and power dissipation in

conduction at a time, so the conduction loss is small, high efficiency. The output can either sink current to the load or pump current from the load. The push-pull output stage increases the load capacity of the circuit and increases the switching speed.Second, open-drain output: The output is equivalent to the transistor collector, to get a high-level state requires a pull-up resistor. Suitable for the cu

output can output high, low level, connect digital devices; Push-pull structure is generally referred to two transistors by two complementary signal control, always in one transistor on the time of the other cutoff. The high and low levels are determined by the IC's power supply.Push-pull circuit is two parameters of the same transistor or MOSFET, to push-pull mode exists in the circuit, each responsible for positive and negative half-cycle of the waveform amplification task, the circuit work,

This digest from: http://blog.csdn.net/kevinhg/article/details/17490273one, push-pull output: can output high, low level, connect digital devices; push-pull structure generally refers to two transistors are controlled by two complementary signals, always in one transistor on the time of the other cutoff. The high and low levels are determined by the IC's power supply. Push-pull circuit is two parameters of the same transistor or MOSFET, to push-pull mode exists in the circuit, each responsible f

) when the input power is turned on, the C pole or D pole is connected to the power source location (-), so there is a low level. The ideal value is 0 V, but the pipe has a conduction resistance, so there is a certain voltage. Different pipes may be different, and the same pipe may be slightly different due to parameter differences, even a real metal contact power switch has a contact resistance/conduction

--- Capacitance change index; capacitance ratio Q --- excellent value (Quality Factor) Delta VZ --- voltage drift of Voltage Regulator DI/dt --- critical rise rate of on-state current DV/dt --- critical rise rate of on-state voltage PB --- withstand pulse burning power PFT (AV) --- forward conduction average dissipation power Pftm --- positive peak dissipation power PFT --- total instantaneous power dissipation of forward

Now the heat of the cup is more and more big, so we often paired with a good radiator, but ignore the role of heat conduction paste. Many people install the radiator when forget to apply thermal paste or improper smear, the result of the system is unstable, and even burned the serious consequences of the processor, so good heat conduction paste is very necessary. 　　Preparation of heat-conductin

enhanced P-Channel MOS tube (e.g. SI2333DS) switching conditions when used as a switch, the PMOs tube is controlled by the VGS voltage value to control the continuity between S (source) and D (drain drain). the minimum threshold voltage for the VGS is 0.4v, which means that the source and drain electrodes are on when the S (source) voltage-G (Gate gate) Pole > 0.4V. and VS = Vd, the S-pole voltage is equal to the D-pole voltage. For example: s extremely 3.3v,g extremely 0.1V, then Vgs = Vg-

How to use the digital Universal meter to measure the polarity of transistors and the method of NPN, PNP . First of all, say the pointer of the multimeter and the digital multimeter of the red-black pen and the internal battery connection difference;So there are some differences between the two types of tables. Next, just talk about how to use the digital measurements. Use a digital multimeter buzzer gear.①, fixed base pole (b)Select the transistor of the two pins, with a red and black pen to

small, high efficiency, small size, light weight, wide voltage regulation range, but its circuit structure is more complex, high failure rate. It works by increasing the internal chip through the switching tube (its frequency and timing capacitance), energy storage inductance and capacitance for a short period of time charge and discharge to the load to provide power (inductor can choose a large point) to output continuous DC voltage, another uo=1.25* (1+R4/R3) (see Manual formula). 4. MIC2930

size of the gate drive voltage, the driving voltage increases, the resistance becomes smaller. Detailed relationship curves can be obtained from the manufacturer's manual. This working condition, known as the synchronous rectification of the MOSFET, is a very important working condition in the low voltage high current output switching power supply. Forward cutoff equivalent circuit of power MOSFET (1): equivalent circuit (2): Description: The power MOSFET can be used as a capacitor equivalent

not exceed 3.5mA. Temperature requirements refers to the chassis power supply internal temperature should not exceed 65 ℃. Electronic interference is divided into two kinds of conduction interference and radiation interference, conduction interference through the power line transmission, the frequency of 30 MHz below, the main interference audio audio section, such as the start of the power in the vicinity

DC switching power supply in the high integration of switching regulators and lightweight small volume, so that the power density within the unit volume greatly increased, so if the internal components of the power supply unit to its operating environment temperature requirements do not improve, will inevitably make the circuit performance deterioration, premature failure of components. Therefore, in high-power DC switching power supply should be set over the thermal protection circuit. In this

. The red pen moves back to the S pole, at which point the tube should be conduction. 4. Then the Red Pen Test D pole, and the black pen to measure s pole, should be measured to a value of 1. (This step should be noted.) because the voltage of the G-pole 2.5V meter is given before the measurement, the DS is still conduction. However, about 10 seconds after the return to normal, it is recommended to carry ou

series is discovered: Generally, a major with high mathematical requirements will take the course of mathematical equations, that is, partial differential equations. there is a classic solution called the separation variable method. however, what you might not expect is that the Fourier series of the famous earthquake was found in the process of using the separation variable method to solve the heat conduction equation !! Next I will give a brief int

Http://www.elecfans.com/dianzichangshi/200805269451.htmlHigh-impedance state: is neither higher nor low, if the high impedance state and then input the next level of the circuit, no impact on the lower circuit, and not the same, if using a multimeter is likely to be high level also may be low level, with the things that follow it fixed.Tri-State output gate Circuit ( TS(three-state output gate) Doorthe schematic diagram of the three-state gate output gate circuit. In the figure, if the two inver