The output voltage of the full wave rectifier circuit U 0 (average) is load dependent. Set the input voltage of the rectifier to U2 (The peak value is U2m, and the internal resistance of the rectifier is Ri. 1, set the load as resistance RL, open circuit voltage U0= 0.9U2, if Ri can be ignored, the load voltage is also U0.
High voltage the greater the power, also depends on the structure of the power amplifier board, but the power of the transformer can not be less than the power of the power amplifier board.
The output voltage of the power amplifier is about 0-50 volts, which is related to the volume potentiometer, the volume is large, the volume is small, the output is small. In the audio part, the audio output of the HD player is connected to the audio input port of the power amplifier, and the power amplifier is directly connected to the speakerConnect with transparent audio cable.
The negative amplifier tube is damaged. It was a transformer that was fired after one of the channels failed. The circuit of the discrete component needs to be checked step by step to determine the fault location, and simple replacement is not easy to solve the problem.
This voltage depends on the power output of the power amplifier. General power amplifier in 0-50V range. However, when the output voltage is 50V, the power is certainly a lot. The audio amplifier is actually to amplify the smaller audio signal, increase its power, and then output.
is the HXJ8002, which is a single-channel 3W, BTL bridge connected audio power amplifier, belonging to the class AB amplifier. It is capable of operating at 5V, 3Ω load, and provides THD10% with an average output power of 3W. 2X3W requires two 8002 chips.
XA8002D audio amplifier chip with 3W power output at 5V power supply voltage and 10% distortion, the pin order is the first pin under the dot mark, and then the first pin is arranged in counterclockwise order. Typical applications are shown below.
An external power supply is required. With hands-on ability, you can consider installing a lithium battery, plus a lithium charging board and switch.
Figure: The capacitance Ci in the box does not increase the circuit magnification. The amplification factor of the amplifier circuit (removal of frequency response impedance) is about equal to: Rf/Ri=Uo1/Ui Therefore, it is good to adjust the ratio of Rf and Ri.
1. XA8002D audio amplifier chip with 3W power output at supply voltage 5V and distortion 10%, the pin order is the first pin under the dot mark, and then the first pin is arranged in counterclockwise order. Typical applications are shown below.
2, audio power amplifier circuit harmonic distortion Harmonic distortion is a distortion caused by nonlinear components in the power amplifier. This distortion makes the audio signal produce many new harmonic components, superimposed on the original signal, forming a waveform distortion signal.
3, to have an ideal voltage amplification stage, the stage frequency response to be wide, speed toThis is a special chip with integrated high-voltage power devices, and at the same time in a special package. There is no direct substitution for the moment. The same model can also be purchased on the market, so it is recommended to use the original model.
This can be replaced, but it is not recommended to use the deposit function for a long time, or there is a difference.
can be directly replaced with TDA2003, or can be replaced with TDA2030 need to change the circuit. Pin function: 1 pin is the forward input end, 2 pin is the reverse input end, 3 pin is the negative power input end, 4 pin is the power output end, and 5 pin is the positive power inputEnd.
The SDH8302 is a current mode PWM controller with built-in high voltage MOSFETs for switching power supplies and can be replaced with Viper12A. SDH8302 Built-in high voltage start circuit. In light load will enter the hiccup mode, thus effectively reducing the standby power consumption of the system. It has the function of frequency reduction to further optimize the conversion efficiency under light load conditions. < / p > < p > KA3842 UC3842 / SG3842 AZ3842 / AS3842 / TL3842 / KIA3842, are interchangeable only manufacturer is different, the cordsThe number is slightly different and can be used on the electric car charger.
1, another model is HXJ8002, is a single channel 3W, BTL bridge connected audio power amplifier, belongs to class AB power amplifier. It is capable of operating at 5V, 3Ω load, and provides THD10% with an average output power of 3W. 2X3W requires two 8002 chips.
2, no 8002B is a model3W, mono class AB audio power amplifier chip. Operating voltage 2V-6V, in the way of BTL bridge connection, under 5V supply voltage, can provide a 3Ω load THD less than 10%, the average output power is 0W. In off mode, the current is typically less than 0.5uA.
3, I will answer it, of course, I am talking about the audio amplifier AB class, personal feeling or 8002B better, there are technical problems can communicate with us here, free technical support. Si Source Technology specializes in providing audio products.
4, so: according to the common 5V power supplyThe separation of components or IC amplifiers, class D: TPA2010/201 ht8608 ax800cx840ax8603/300/8609/2000/2005, etc., the class AB: LM4890/488 ht4818 csc8002/486/4836.