The EMI filter we designed is a combination of these three techniques, which allows low-frequency useful signals to pass through smoothly, while suppressing high-frequency interference. Although the current is not large, only 2A (400W) / 4A (800W), only applicable to the working current is not large, but the power requirements of the device is very high, such as low-power preamplifier, desktop CD, DAC decoder camera and other equipment, such as the input AC power purification. It can suppress the noise and high harmonics of the power grid and the noise and high frequency harmonics generated by switching power supply, motor and so on. Improve the purity of audio sound quality and reduce the noise generated by the interference of AC power supply.
Installation position: The power line is the main way to interfere with the incoming and outgoing equipment, through the power line, the interference of the power grid can be transmitted to the equipment, interfering with the normal work of the equipment, the same equipment generated by the interference may also be transmitted to the power grid through the power line, interfering with the normal work of other equipment. Therefore, the ideal installation location is the power socket of the equipment, such as audio equipment before the transformer, before the switching power supply, the back of the monitor power port and other places.
Power Filter Board 2A 4A 18A EMI Filter Sound Enhancer Filter Socket Kit Soldering Required
PCB is double-sided gold PCB, lower internal resistance, better conductivity.
The use of imported film capacitors imported from Italy, the effect is better than the yellow ordinary imports and Swedish industrial capacitors, thick copper wire common mode inductors, high-power plugs! 2A current capacity, with the use of decoders, the sound is soft and smooth, improve the resolution of the obvious, the background is clean!
4A and 18A are suitable for amplifiers and other power-consuming equipment.
3-pin plug for the input: respectively connected to AC GND AC
2-pin plug for the output 220V
Link in 220V and transformer directly. Sound details clean! Bulk parts need hands-on welding Oh!
PCB size: 32X63MM
There are 2A kit and 4A kit optional, 2A suitable for earphone, preamplifier, DAC . 4A 18A suitable for amplifier use!
4A oxygen-free copper filtering common mode inductor
18A is suitable for high power amplifiers, class A, etc. The internal resistance is super low, even for 100W amplifier, it is very beneficial.
Introduction: With the development of electronic technology, high-power electrical appliances, switching power supplies and other high-frequency electromagnetic interference problems become extremely difficult problem in the circuit interference, they interfere with each other, but also self-interference, so that the power supply is subjected to high-frequency EMI contamination, the light is unstable operation of the equipment, or frequent reboot and other strange failure problems. In this environment, EMI filters are designed to greatly improve this situation.
Topic: For high-frequency electromagnetic interference (EMI), there are usually three techniques can be power supply filtering in order to inhibit the interference noise, in practice, often a mixture of two, or even a variety of technologies. They are:
1.the power supply fire zero line between the addition of capacitance, that is, X capacitance.
2.add capacitance between each power line and ground line, i.e. Y capacitance.
3.Common-mode suppression (suppression coils on both power lines).
