1. The LED runs dark for a while, which is caused by the excessive current flowing through the switching power supply lead. It can be checked whether the total current of the lead exceeds the current value of the switching power supply output. If so, replace the power leads.
2. The LED is very bright when it is powered on. After a period of time, it suddenly does not light up or the brightness is attenuated. It can be checked whether the switching power supply is 12V and the LED is misused to be 24V.
3. If there is no problem, check if the input voltage of the switching power supply is 220V. If the LED brightness is high or low: check whether the input voltage and output voltage of the switching power supply are normal. If the voltage is too high, it will cause the LED to burn out; if the voltage is low, it will cause the LED to not light or the brightness to decay. If the voltage of the user's location is very unstable, users may be advised to install a voltage regulator.
A large class of alcohols and organic compounds is a compound in which a hydrogen atom in an aliphatic hydrocarbon, an alicyclic hydrocarbon or an aromatic hydrocarbon side chain is substituted with a hydroxyl group. Generally referred to as an alcohol, the hydroxyl group is attached to a saturated, sp3 hybridized carbon atom. If the hydroxyl group is bonded to the benzene ring, it is a phenol; if the hydroxyl group is linked to the sp2 hybridized olefinic carbon, it is an enol. The properties of phenols and enols are quite different from those of general alcohols.
A phenol having the general formula of ArOH is a type of aromatic compound in which a hydrogen on an aromatic hydrocarbon ring is substituted with a hydroxyl group (-OH). The simplest phenol is phenol. The phenolic compound refers to a compound formed by substituting a hydrogen atom on a benzene ring in an aromatic hydrocarbon with a hydroxyl group, and can be classified into a monohydric phenol and a polyhydric phenol according to the number of hydroxyl groups contained in the molecule.
Alcohols, Phenols, Phenolic Compounds And Derivatives
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