Dimming The Lights with remote controller, device Ir Light Dimmer, has got a new and simplest version. The most significant change is microcontroller PIC12F629 in Small-Outline Integrated Circuit (SOIC) package, TSOP2238 ir receiver instead of TSOP1738, and less components on circuit board.source

This dimmer switch is suitable for 230V incandescent lamps with a total power of up to 300 Watts.The circuit is switched in series with the lamp so it can directly replace the wall switch.The circuit will also work at 120V/60Hz, P1 must be smaller in that case.source

Here is a wireless controlled light dimmer.When you switch the power on there will follow a soft-start till the lamp burns at the previously adjusted dim level.With the ‘0′ button in TV mode you can dim the lamp, turn more and less bright.The remote control should send more then one RC5-signal per button-press seeing that the first one is ignored, this does imply that when the remote button is pressed a short time, there nothing happens.source

In this circuit, the following features of PIC16F873 are used. A/D converter The voltage controlled by the variable resistor (Analog) is converted to the digital signal.This signal is used to control the pulse duration (the duty) of PWM.Compare A/D converting is executed every 1-millisecond period using this function.PWM The electric current which flows through the lamp is controlled by the PWM pulse signal.In this circuit, the pulse of about 610 Hz is used. source

This is the circuit diagram of a 12V light dimmer switch. The circuit is constructed with 555 time oscillators and resistors. Two different circuits are shown for light dimmer. One shows the circuit when lamp is connected to the positive connection and the other connected to the negative side of the supply. The circuit uses the principle of capacitors which is when charged produces short positive interval and long negative interval which dims the intensity of the light.source