Abstract: There is provided a smoke detector including a first light source, a second light source surface, a light sensor and a processor. The light sensor receives reflected light when the first light source and the second light source emit light, and generates a first detection signal corresponding to light emission of the first light source and a second detection signal corresponding to light emission of the second light source. The processor distinguishes smoke and floating particles according to a similarity between the first detection signal and the second detection signal.

Abstract: A dimming circuit for a gas-discharge lamp includes a first terminal and a second terminal for inputting AC power, a variable resistor and a capacitor connected with the respective first end to each other and the respective second end to the first input terminal and the second input terminal respectively, a bi-directional diode connected with one end to the first end of the variable resistor and the first end of the capacitor, a TRIAC, which has the gate thereof connected to the second end of the bi-directional diode and one end connected to the second input terminal, and a switch connected in series between the second input terminal and the capacitor for circuit on/off control, for enabling the light intensity of the gas-discharge lamp to be regulated subject to change of the resistance value of the variable resistor.

Abstract: A dimming circuit for a gas-discharge lamp includes a first terminal and a second terminal for inputting AC power, a variable resistor and a capacitor connected with the respective first end to each other and the respective second end to the first input terminal and the second input terminal respectively, a bi-directional diode connected with one end to the first end of the variable resistor and the first end of the capacitor, a TRIAC, which has the gate thereof connected to the second end of the bi-directional diode and one end connected to the second input terminal, and a switch connected in series between the second input terminal and the capacitor for circuit on/off control, for enabling the light intensity of the gas-discharge lamp to be regulated subject to change of the resistance value of the variable resistor.