Which brand is good, front water purifier ranking The water purifier is mainly divided into ultra-filtration water purifier, activated carbon water purifier and reverse osmosis water purifier (Ro machine ).■ The ultra-filtration water purifier simply filters out sediment, colloid and bacteria, cannot filter out scale, heavy metals and chemical pollutants, and cannot improve the taste. the external pressure type cannot be washed and discharged, and the internal pressure type can be washed and discharged, the advantages are: no electricity, no waste of water, large flow, long filter life (1-5 years)■ Activated carbon water purifier can absorb foreign-colored peculiar smell, improve taste, and can't filter out scale, heavy metals and chemical pollutants. there is little difference between boiling and drinking, making tea and tap water, there are also secondary pollution problems such as bacterial breeding and nitrite exceeding the standard, which are prone to saturation failure and need to be replaced onc
Why does a signal with small noise introduce high-frequency noise after passing through the first-order active low-pass filter? There are generally several situations,The power supply is not clean,Bad circuit shielding,There is self-excitation.From the circuit,First-2 times magnification,Clutter is non-linear,And in the first half of the week,Similar to the modulation state,There will also be problems with amplifier failures,I have encountered the same situation.