Abstract: The present invention particularly discloses a novel feedback circuit, mainly comprising: a signal sampling unit, a feedback unit, a signal concerting unit, and a signal adjusting unit. During the operation of the feedback circuit, a current-mode error amplifier unit is configured to output a current error signal based on a current sampling signal and a dimming signal outputted by the signal converting unit, so as to activate a PWM controlling unit to stabilize an output current of a LED driver circuit. In the meantime, a voltage-mode error amplifier unit cooperates with the PWM controlling unit to adaptively regulate an output voltage of the LED driver circuit based on a voltage sampling signal and an adjustment signal outputted by the signal adjusting unit, in order to facilitate the LED driver circuit provides a constant output power.

Abstract: An electronic device and a rotating mechanism thereof are provided. The electronic device includes a first casing, a second casing, and a rotating mechanism. The first casing has a first receiving space and a first hole disposed a first side thereof, wherein the first receiving space is intercommunicated with the first hole. The second casing has a second receiving space and a second hole disposed a second side thereof, wherein the second receiving space is intercommunicated with the second hole. The rotating mechanism includes a shaft, a first fixing element and a second fixing element. The shaft has a center axis, wherein part of the shaft is received in the first receiving space and part of the shaft is received in the second receiving space, such that the first casing can be rotated around the center axis with respect to the second casing.

Abstract: An electronic device and a rotating mechanism thereof are provided. The electronic device includes a first casing, a second casing, and a rotating mechanism. The first casing has a first receiving space and a first hole disposed a first side thereof, wherein the first receiving space is intercommunicated with the first hole. The second casing has a second receiving space and a second hole disposed a second side thereof, wherein the second receiving space is intercommunicated with the second hole. The rotating mechanism includes a shaft, a first fixing element and a second fixing element. The shaft has a center axis, wherein part of the shaft is received in the first receiving space and part of the shaft is received in the second receiving space, such that the first casing can be rotated around the center axis with respect to the second casing.

Abstract: The keyboard module includes a base, a transparent layer, a light source, and a reflective layer. The base includes a dome, and the transparent layer is adjacent to the base. The light source provides light to the transparent layer. The reflective layer covers the transparent layer and has a first opening and a second opening, wherein the first opening corresponds to the dome and the second opening corresponds to the light source.