Resistor-capacitor combination can also be composed of delay, decoupling, shaping, filtering, buffering, noise reduction, anti-interference, calculus and other circuits.
In a word, resistors are mainly used to suppress current and distribute voltage in electronic circuits.
What role does 0 Ω resistor play in electronic circuit? 1 has no function in the circuit, but is used on PCB for debugging convenience or compatibility design.
2. It can be used as jumper. If a wire is not used, just don't stick a resistor directly (it won't affect the appearance).
3. When the independent variable of the matching circuit is uncertain, use 0 ohm instead. In actual debugging, determine the parameter and then replace it with a component with a specific value.
4. When you want to measure the current consumption of a certain part of the circuit, you can remove the 0 ohm resistor and connect the ammeter to facilitate the measurement of current consumption.
5, wiring, if the cloth can't pass, you can also add a 0 ohm resistor.
6. Under high frequency signal, it acts as an inductor or a capacitor. Inductors (related to the characteristics of external circuits) are mainly used to solve EMC problems. For example, between ground and ground, between power supply and IC pin.
7. Single-point grounding (protective grounding, working grounding grounding and DC grounding) is separated from each other on the device and becomes an independent system. )
8, fuse function
* Analog ground and digital ground are single-point grounding * As long as it is ground, it will eventually be connected together and then grounded. If they are not connected together, they are "suspended", and there is a pressure difference, which is easy to accumulate charges and generate static electricity. The ground is the reference potential of 0, all voltages come from the reference ground, and the standards of the ground should be consistent, so all kinds of ground should be shorted together. It is the ultimate reference point that the earth can absorb all charges and remain stable all the time. Although some boards are not grounded, the power plant is grounded, and the power supply on the boards will eventually return to the power plant and enter the earth. If analog ground and digital ground are directly connected in a large area, it will lead to mutual interference. There are four ways to solve this problem: 1, connected by magnetic beads; 2. Connect with the capacitor; 3. Connect with inductor; 4. Connect a 0 ohm resistor. The equivalent circuit of magnetic beads is equivalent to a band-stop limiter, which can only significantly suppress the noise of a certain frequency point. When using it, it is necessary to estimate the noise frequency in advance in order to choose a suitable model. Magnetic beads are incompatible when the frequency is uncertain or unpredictable. The capacitor is separated from the DC current, resulting in floating ground. Inductor is bulky, with many stray parameters and instability. 0 Ω resistor is equivalent to a very narrow current path, which can effectively limit the loop current and suppress noise. Resistance has attenuation effect in all frequency bands (0 Ω resistance also has impedance), which is stronger than magnetic beads. * jumper is used for current loop * When the ground plane is divided, the shortest return path of the signal is disconnected. At this time, the signal loop will detour to form a large loop area, and the influence of electric field and magnetic field will become stronger, which will easily interfere with/* * *. Connecting a 0 ohm resistor to the diaphragm can provide a shorter return path and reduce interference. * Configuration circuit * Generally, there should be no jumper and dip switch on the product. Sometimes users tamper with settings, which can easily lead to misunderstanding. In order to reduce the maintenance cost, 0 ohm resistor should be used instead of jumper wire to weld on the board. Empty jumper is equivalent to antenna at high frequency, and patch resistance is effective. * Other uses * Temporarily replace other patch devices as temperature compensation devices for cross-line debugging/testing during wiring.
More often for the needs of EMC countermeasures. In addition, the resistance of 0 ohm is less than the parasitic inductance of the via, and the via will also affect the ground plane (because a hole is to be dug).
What role does IRF540 play in electronic circuits? It is an N-channel field effect transistor, which can be used as an electronic switch.
What role does the filter capacitor play in electronic circuits? The principle that the capacitor plays a filtering role in the circuit is as follows:
Because the reactance of the capacitor z= 1/(2πfc),
1. For a small capacitor C, when encountering high-frequency current, the reactance will become very small, which plays a role in filtering out high-frequency interference signals.
2. For the large capacitor C, the reactance will become very small regardless of high frequency or low frequency current, so the AC interference signal will be filtered out.
3. For all DC signals, the capacitor is turned off, so the DC signal is retained. This is also used in some circuits to prevent the influence of DC signal on the circuit.
Capacitor, usually referred to simply as its ability to hold charge, is a capacitor, which is represented by the letter C. Definition 1: A capacitor, as its name implies, is a' charged container' and a device that holds charge. English name: capacitor. Capacitor is one of the electronic components widely used in electronic equipment, which is widely used in blocking DC, coupling, bypass, filtering, tuning circuit, energy conversion, control and so on. Definition 2: capacitor, any two conductors (including wires) that are insulated from each other and closely spaced form a capacitor.
What role does the adjustable resistor play in the electronic circuit of infrared induction switch? You mentioned it extensively, and I will briefly talk about it. Adjust the circuit to the best working condition.
In the design and production of electronic circuit products, not all electronic components have the same efficiency, and the products of the same model from the same manufacturer do not necessarily have the same parameters, which leads to inconsistent working efficiency of the same product. Therefore, electronic products must be "debugged at the working point" when leaving the factory, and some adjustable components are designed in the circuit. Such as; Trimming resistor, trimming capacitor, adjustable inductance, etc.
Adapt to the working environment. Not all similar products work under the same working conditions. In order to adapt to the working environment, it is necessary to adjust the efficiency of products. For example, if you buy a DC power supply with an output voltage of 6- 12 volts, and your current experiment only needs 7.5 volts, you can adjust the output voltage of the regulated power supply to 7.5 volts.
Buffer, compensation (technical term). The performance and parameters of some electronic components will change under different temperature conditions and long-term operation, so the circuit designs some adjustment measures for the function of compensation circuit.
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What role does nur460P tube play in the electronic circuit of switching power supply? It is generally used in rectifier circuit to convert AC pulse voltage into DC voltage, and its other function is reverse pulse absorption.
What role does resistance play in the circuit? Resistance is a physical property.
It doesn't say that it has a specific function, and it has different functions in different places.
Such as limiting current, or releasing heat, or emitting light, etc.
What role does resistance play in the circuit? Its main function is to prevent current from flowing, and it is applied to current limiting, shunt, voltage reduction, voltage division, load and capacitance matching as a filter, resistance matching and so on. Functions in digital circuits include pull-up resistors and pull-down resistors.
Please refer to the webpage. What role does the connection resistance play in the circuit?
Putting it in different places has different functions, such as limiting current, or releasing heat or emitting light. .......
Connecting a resistor in series with a device can divide the voltage.
Shunt can be realized by connecting a resistor in parallel with a device,
Resistors can generate heat and can be used for heating, such as electric furnaces.
Used for current limiting, shunt, step-down, voltage division, load and capacitance matching as filter and resistance matching.
Digital circuit pulls high level and low level, with pull-up resistor and pull-down resistor.
What role does capacitance play in electronic circuits? Energy storage, filtration ~ ~ ~