0 euro Resistance

We often see 0 euro resistance in the circuit. For new users, it is often confusing: since it is a 0 euro resistance, it is a wire, why should we install it? Is there such a resistance market available? In fact, 0 euro resistance is quite useful. The following functions are available:
① Used as jumper. This is both beautiful and easy to install.
② In digital and analog hybrid circuits, it is often necessary to separate the two and single point connection. We can use a 0-euro resistor to connect the two places, instead of directly connecting them together. The advantage of doing so is that the ground wire is divided into two networks, which makes it much easier to process large areas of copper. Note that in such cases, the inductor or magnetic beads are sometimes used for connection.
③ Use fuses. Because the circuit breaking current on the PCB is large, if short-circuit and overcurrent faults occur, the circuit breaking may lead to more serious accidents. Because 0-euro resistance and current capacity are relatively weak (in fact, 0-euro resistance also has a certain degree of resistance, but it is only small), the 0-euro resistance will be broken first when the flow is over, thus, the circuit is disconnected to prevent larger accidents. Sometimes the fuse is made with a small resistor with a resistance of a few or a few euros. However, this is not recommended for use, but some vendors will use it to save costs.
④ Reserved location for debugging. You can determine whether to install the tool or other values as needed. Sometimes it is marked with "*", indicating that it is determined by debugging.
⑤ Used as the configuration circuit. This function is similar to patch cord or dial switch, but it is fixed by welding, so that common users can modify the configuration at will. By installing resistance at different positions, you can change the function or set the address of the circuit.

0 euro resistance not only have to sell, but also have different specifications, usually by power, such as 1/8 Watts, 1/4 Watts and so on.

Other answers
① Used as jumper. This is both beautiful and easy to install.
② In digital and analog hybrid circuits, it is often necessary to separate the two and single point connection. We can use a 0-euro resistor to connect the two places, instead of directly connecting them together. The advantage of doing so is that the ground wire is divided into two networks, which makes it much easier to process large areas of copper. Note that in such cases, the inductor or magnetic beads are sometimes used for connection.
③ Use fuses. Because the circuit breaking current on the PCB is large, if short-circuit and overcurrent faults occur, the circuit breaking may lead to more serious accidents. Because 0-euro resistance and current capacity are relatively weak (in fact, 0-euro resistance also has a certain degree of resistance, but it is only small), the 0-euro resistance will be broken first when the flow is over, thus, the circuit is disconnected to prevent larger accidents. Sometimes the fuse is made with a small resistor with a resistance of a few or a few euros. However, this is not recommended for use, but some vendors will use it to save costs.
④ Reserved location for debugging. You can determine whether to install the tool or other values as needed. Sometimes it is marked with "*", indicating that it is determined by debugging.
⑤ Used as the configuration circuit. This function is similar to patch cord or dial switch, but it is fixed by welding, so that common users can modify the configuration at will. By installing resistance at different positions, you can change the function or set the address of the circuit.

0 euro resistance specifications, generally divided by power, such as 1/8 Watts, 1/4 Watts and so on.

1. Single Point Grounding in analog and digital locations
As long as it is the land, it will eventually be connected together and then enter the Earth. If it is not connected together, it is "floating", there is a pressure difference, it is easy to accumulate the charge, resulting in static electricity. The ground refers to the 0 potential, and all voltages are obtained from the reference ground. The ground standards must be consistent, so all kinds of ground should be transient together. People think that the earth can absorb all the charge and always maintain stability, which is the final reference point. Although some boards are not connected to the earth, power plants are connected to the earth, and the power supply on the boards will eventually return to the power plant. If the simulated area is directly connected to the digital area, mutual interference will occur. There are four ways to solve this problem: Use a magnetic beads to connect; use a capacitor to connect; use a inductance to connect; use a 0 ohm resistor to connect. The equivalent circuit of a magnetic bead is equivalent to a band-resistance wave limiting device, which only significantly blocks noise at a certain frequency point. It is necessary to estimate the noise frequency in advance so as to select an appropriate model. Magnetic beads do not match when the frequency is uncertain or unpredictable. The capacitor is separated directly, causing float. The inductance is large in size and has many stray parameters, which is unstable. 0 euro resistance is equivalent to a very narrow current path, which can effectively limit the Loop Current and suppress noise. Resistance degrades in all frequencies (0 euro resistance also has impedance), which is stronger than magnetic beads.

2. When the current circuit is used for cross-connection, when the ground plane is split, the shortest reflux path of the signal is broken. At this time, the signal loop has to bypass to form a large loop area, the influence of the electric field and the magnetic field becomes stronger, and it is easy to interfere with/be disturbed. The split zone is connected with 0 euro resistance, which can provide a shorter reflux path to reduce interference.

3. General configuration circuit. Do not use jumper or dial switch on the product. Sometimes users may tamper with the settings, which may cause misunderstanding. In order to reduce maintenance costs, use 0 euro resistance instead of jumper and other welding on the board. A vacant jumper is equivalent to an antenna at a high frequency. It works well with SMD resistors.

4. Cross-Line Debugging/testing for other purposes: when starting the design, a resistor is required for debugging, but the specific value cannot be determined, after such a device is added, it facilitates circuit debugging. If the debugging result does not require a resistor, it adds a 0 ohm resistor. The temporary replacement of other SMD devices as temperature compensator is more often due to EMC's countermeasure. In addition, the 0 ohm resistance is smaller than the parasitic inductance of the passing hole, and the passing hole will also affect the ground plane (because the hole needs to be dug ).




1. There is no function in the circuit, just for convenience of debugging or Compatibility Design on the PCB.
2. Jumper can be used. If a line is not used, do not paste the resistor directly (without affecting the appearance)
3. When the parameters of the matching circuit are uncertain, the parameter is replaced by 0 ohm. during actual debugging, the parameter is determined and replaced by the component of a specific value.
4. When you want to test the current consumption of some circuits, you can remove the 0ohm resistor and connect it to the current meter to facilitate the current consumption test.
5. When wiring, you can add a 0-euro resistor if it cannot be deprecated.
6. Act as an inductor or capacitor under a high-frequency signal. Inductance is used to solve EMC problems. Such as location, power supply, and IC pin
7. Single Point Grounding (spof) refers to the separation of protection grounding, working grounding, and DC grounding from each other on the equipment, and each of them becomes an independent system.
8. Melting Effect
 
 

The "Compensating resistor" is used in many occasions, and its function is also very different.

However, it is common to say "temperature compensated resistance ". It is mainly used to compensate for the error generated by the measurement component due to the Environmental Temperature Change During measurement (the voltage signal is changed ). Because the resistance of many conductors increases with the increase of temperature, the electrical signals produced by the measurement elements will be affected during the measurement and transmission processes.

To compensate for the changes of voltage signals produced by measurement elements with temperature, the bridge compensation method can be used, the principle is to place the three arm of the bridge with three standard resistors at a constant temperature, the compensation resistance that changes with the temperature of a bridge is used as another bridge arm of the bridge. In this way, when the temperature changes, the two ends of the bridge will generate a certain voltage. If well designed, this voltage can be exactly the same as the change of the voltage signal produced by the temperature changes of the measurement element. Overlay the compensation bridge signal with the measurement signal to compensate for the impact of temperature changes.

In order to reduce the influence of the temperature coefficient of the transmission resistance, a compensated resistance with a "negative temperature coefficient" can be concatenated in the transmission circuit (its resistance decreases with the increase of temperature, the total resistance of the transmission line is not changed due to the temperature change, that is, the total resistance of the transmission line is constant.

As for other compensating resistors, the principle is basically similar, so we will not go into details.
 

0 euro Resistance