Is Changsha Tong Fei Wedding Photography Studio OK?

His [our] home is [clearly] Chu, and he is [doing] in [dragon] sand. These "homes", "lakes" and "southern provinces" all passed the name "Mo".

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Working principle: 2.4. After the microcomputer of PS signal and PG signal generating circuit and PWM control circuit is powered on, the PS signal sent by the motherboard controls the voltage of the four pins (PWM control terminal) of IC2. During standby, the electronic switch of the motherboard startup control circuit is turned off, and the PS signal outputs a high level of 3.6V, which reaches the 6 pins (startup terminals) of IC 1 (voltage comparison amplifier LM339N) through R37. C35 is internally charged through the pin ③ of IC 1, while the pin ② of IC 1 sends a comparison voltage to the pin ④ of IC2 through R4 1, and the voltage at the pin ④ of IC2 gradually rises from zero potential. When the rising voltage exceeds 3V, the pins ⑧, χ 1 1 are blocked.