Why does the touch light turn on by itself

If the anti-interference ability of the lamp is not good, the external interference clutter will enter the switch circuit from the desk lamp, causing a malfunction, causing the lamp to brighten by itself.

When touching the metal area of the lamp, an induction signal will be generated. This signal will be amplified at the first level, and then a switch information will be provided to the thyristor control port to make the indicator light bright.

Generally, the lamp has the corresponding anti-interference ability. If the anti-interference ability is poor, the interference signal will be used as a switch action to brighten itself.