Light up the desk diagram

Probe domestic switch needle KG-300K needle head diameter is 3.0mm normally open switch needle

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Filter 18.432M

This is a kind of human body induction lamp. When the human hand touches the metal part of the table lamp, the light is on, and it is always bright, so it is also called "a bright" table lamp. When you want to turn off the light, you can turn off the metal part of the table lamp again, which is very convenient. The electrical signal emitted by the human body ranges from 0 to 5 kHz, and the output voltage is in the range of microvolts to millivolts, which is a very weak voltage. Observed by the oscilloscope, there are many harmonic components. When a person touches the metal piece M by hand, it is equivalent to providing a signal to the VT base, and after being amplified by current, it is sent to the TWH8778 high-power drive switch integrated circuit, so that the NE5556 pin is at a low level, and the 3 feet are at a high level. Work in the same state as before. As shown below: