Working principle of the circuit: The circuit
consists of . The soft start circuit consists of VT2, R3, C3, etc. When the power is just turned on, C3 is equivalent
to a short circuit. The power is connected to the ground through R3, the be junction of VT2, and C3. VT2 is saturated and turned on. Point A
is pulled to a low potential. VT is cut off due to no base current, and the LED does not emit light.
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