Hold the LM1875 chip, with the font side facing yourself. From the far left is the first pin, the first pin audio signal input, the second pin negative feedback, the third pin negative power supply, the fourth pin soundFrequency signal output, pin 5 positive power supply. Internal structure: Output power up to 30 watts, A VO is often 90 dB.
can be replaced directly. The LM1875 and TDA2030 (A) adopt the same TO220B package and have the same pin definition. In terms of parameters, the maximum voltage of LM1875 supports 60V, while that of IDA2030 (A) is 44V.
Is it a circuit board or module? If it is a dummy module, it usually has one input pin, two ground pins, three negative power pins, four output pins, and five positive power pins. Other circuit boards are generally of this structure.
2, is a memory chip, used to store data A0 to A12 for 13 address signal input lines, indicating that the chip capacity is 2 to the 13th power, that is, 8K D0 to D7 for the data line, indicating that each memory unit of the chip stores a byte (8-bit binary number).
3. Yes. The TNY276P is a dual-in-line 8-pin (actually 7-pin) package. The output voltage is 12V, the frequency range is 124~140kHz, the operating temperature is -40℃~150℃, and a 700V power MOSFET and oscillator are integrated.
4, V, mc34072 is a low-power dual-J-K master-slave flip-flop chip that changes its state according to the rising edge of the clock signal. The control part is composed of two chips CD4047 and CD4027. The CD4047 is connected to a positive side-triggered monostable multivibrator circuit mode, which is used to set and reset the CD4027.
5, the eight feet on the chip can have different functions, depending on the type of chip and design. The pin functions of the chip mainly have the following: Power pin: Some of these pins may be used for the power supply of the chipPositive power (VCC) and ground (GND) connections are provided.
1, ● Conversion efficiency: 75% ~ 88% (different voltage output efficiency is different); ● Operating temperature range: LM1575 -55℃ ~ 150℃; LM2575/LM2575HVThe temperature ranges from -40℃ to 125℃. Figure 1 shows the two pin arrangements of the LM2575 integrated regulator.
2, it is no problem to replace LM2576HVT with LM2575T, but it must be the output voltage of the same. 2576HVT output current is 3A, the voltage is 63V, and 2575T is 1A, the voltage is 45V, instead of is completely OK, is to use a bit of overuse, waste.
3, it is recommended that you use LM2576, its maximum input voltage 40V, output current up to 3A. It looks the same as the 7805Same, except it's 5-pin package. Note that the LM2575 is the same as the 2576 application circuit, except that the 2575 output current is smaller. See the diagram for the circuit. All you have to do is replace 2575 with 2576.
1. Principle of the LM2596 adjustable power moduleThe figure is as follows: Input filter circuit: CLCC3 composed of double π filter network is mainly to suppress the electromagnetic noise and clutter signal of the input power supply, to prevent interference with the power supply, but also to prevent the high-frequency clutter generated by the power supply itself from interfering with the power grid.
2, in fact, this is very simple, you can directly view the LM2577 and LM2596S datasheet can be drawn. Make sure that the associated lines are thick enough.
3. Yes. Using the current international advanced high-frequency modulation technology, its working principle is to expand the voltage and current of the switching power supply to achieve electricityWide range of voltage and current regulation.
4, the circuit diagram refers to the circuit connection diagram with the circuit component symbol. The circuit diagram is a kind of principle layout diagram that expresses the composition of each component and the relationship of the device, which is drawn by the symbol of the standardization of physics and electricity for the need of research and engineering planning.
5, PCB diagram, is a mapping drawing of the circuit board, it describes the circuit board in detail, the position of the components, etc. Circuit diagram is the electrical schematic diagram of electronic equipment, with electronic symbols and connections, composed of electronic components of the connection diagram (belongs to the design document.
6, PCB schematic is aSimple 2-D circuit design showing the functions and connections between different components. So the PCB schematic is the first part of the printed circuit board design. This is a graphical representation, whether written or in data form, that uses agreed symbols to describe circuit connections.
LM2576 Internal high frequency oscillator, high frequency current switch, and output voltage sampling and comparison controller. The voltage sampling circuit samples and compares the voltage at both ends of the capacitor, and adjusts the on-off time of the current switch according to the results of the comparison, which is PWM (pulse width adjustment).
LM2596 is the second generation of switching regulated power supply, switching frequency up to 150KHz, so the filter inductance and output capacitance can be achieved a little smaller.
The LM2576 switch frequency is 52K, and the LM2596 switch frequency is 150K. High frequency means that the requirements for inductance capacitance are reduced, at the same timeIt also reduces the device size requirements. After all, the 100uH, 1000uF parameters of the LM2576 are no joke.
Theoretically, the higher the switching frequency, the smaller the volume of the switching power supply, and the lower the cost of the filter circuit is required. However, due to the characteristics of the magnetic equipment, the parasitic parameters of the device, after the switching frequency is increased, the influence of parasitic capacitance and inductance will be more and more large, limiting the improvement of the switching frequency.
The larger the capacitance, the more time it takes to fill the capacitor; The larger the inductance, the longer it takes the capacitor to charge the inductance. So the higher the signal frequency, the harmonicThe smaller the parameter value of the vibration circuit.
magnetic device) bucket then you have to run 10 times (frequency) if you use 1 square (magnetic device) bucket then you have to run 100 times (frequency) that is to say, the more times you run (the higher the frequency) the smaller the value of the magnetic device you need, the smaller the volume. The magnetic devices here include transformers, output inductors, output capacitors, etc.
1, LM386 is an audio integrated power amplifier, with its own low power consumption, update the internal chain gain can be adjusted, the power supply voltage range is large, fewer external components and the total harmonic distortion is small and other advantages, widely used in tape recorders and radios.
2, LM386 pin diagram and function: LM386 is a small amplifier with 8 input/output pins, namely: 1-IN, 2-IN, 3-GND, 4-VCC, 5-OUT, 6-GND, 7-BYPASS, 8-VCC. Its functions are as follows: 1-IN: positive terminal of the input signal power supply, used to receive input signals.
3, LM386 is a power amplifier chip, is designed for low loss power supply power amplifier integrated circuit. It has a built-in gain of 20, up to 200 through the combination of capacitors between pin 1 and pin8.
4, about the lm386 pin diagram schematic, lm386 pin diagram this many people do not know, today to answer the above questions for you, now let's take a look! Pin 2 is the inverting input, and pin 3 is the positive input.
5, LM386 has a wide range of applications, because of its low voltage and low power consumption characteristics, especially suitable for the use of dry batteries as power supplies in electronic devices. Figure 2-51 shows a typical application of the LM386. In the figure, no resistance-capacitance element is connected between pin 1 and pin 8, and the circuit gain at this time is only determined by the internal resistors R7 and R5 R6, which is 20 times.
6, as shown in the schematic diagram, the core components are LM386 chips: 1 and 8 pin gain; 2 pin square phase input; 3 pin positive phase input; 4-pin grounding; 5 pin output; 6 Connect to the power supply; 7 Foot decoupling.