The DC isolation board can suppress the transformer noise caused by DC in the 220V power grid, but it does not work for poor quality transformers that make noise even with pure AC. Please observe the transformer carefully. If it makes a loud noise sometimes and is very quiet sometimes, it means that there may be DC components in the power grid. AC with DC components in the power grid will cause the transformer to make annoying noise, especially the ring transformer.

In the city power grid, the AC waveform is originally. The upper half wave and the lower half wave are symmetrical, but because thousands of households share the same power grid, various different electrical appliances are used in parallel (such as electric heaters, hair dryers, etc. - the low power gear of some electrical appliances is usually adjusted by simple series diodes), which will cause the upper half wave or the lower half wave of the AC to have an unbalanced voltage drop and produce a certain DC component. For high-power transformers, the primary resistance is very low, generally only a few tenths to a few ohms of resistance, especially the ring transformer core is a whole strip of steel sheet without magnetic spacing, a very low voltage can reach the magnetic saturation of the core, (such as in the power grid With a 2V DC voltage, the primary resistance of a 500W toroidal transformer is less than 2 ohms. Current = voltage divided by resistance. Just because this 2V DC voltage can make the primary current of the transformer reach 1A), this will not only increase its own power consumption and temperature rise, but also increase working noise, and even cause abnormal magnetic saturation of the transformer core. This product is connected in series in the AC220V live wire. It uses a 25A high-current rectifier bridge. Six-stage series connection eliminates the DC component more thoroughly. It effectively eliminates the abnormal transformer sound caused by the DC component in the power grid (especially the ring cow sound). The board has an LED light-emitting diode. It takes a 2V voltage to light up the light-emitting diode. Usually the light-emitting diode is not bright. If the light-emitting diode is bright during use, it means that the DC component in the power grid is already very high, and the effect is visible.

This product uses 6 25A flat bridges, which is equivalent to 24 discrete diodes, 4 parallel and 6 series structure (some use only 2 bridge stacks, which only have 2-level diodes, and the isolation voltage is low and not thorough enough). It is not comparable to the discrete diodes with only 3A current. The small current diode is easily burned out by overcurrent under high power use. The capacitor uses 12 3300UF 6 parallel and 2 series. If the capacitance is too small, the AC internal resistance will increase. When used in the power amplifier, the sound will become thin and the low frequency will be weak. Please compare carefully before buying. Product size: board size 7.5X6cm, height 4CM, hole spacing 6.7X5.2cm, height 4CM (including copper column height) Usage: Connect in series to one of the 220V AC input lines, regardless of the live wire and the neutral wire. Note that it is series connection, parallel connection is equivalent to short circuit.

Note:

1.Due to the light and screen difference, the item's color may be slightly different from the pictures.

2.Please allow 1mm-1cm differences due to manual measurement.

Package Includes:

1x Power Filter