Hybrid dimmer circuit schematic

Photocoupler

Working principle: According to the electrical principle, the capacitor is connected to the sinusoidal AC circuit, and the maximum value of the voltage and current is 90° out of phase. According to this principle, C1 and C2 are connected in series, and the difference is taken out from the middle for my use, which is more stable than the series connection of the resistor and the capacitor. In the circuit, D1 and D2 rectify the positive half wave and the negative half wave of the power supply, respectively, and are applied to the A trigger and C1 or C2 charging.