I bought a four-coded remote control dimmer switch (hereinafter referred to as the remote control switch), which has the following characteristics: 1. Manually or by remote control to control the lights on / off and dimming. 2. Remote control with a remote control room mounting position of the four different receivers. 3. Each receiver is independent of the control light, the output power up to 700W. 4. With the brightness of memory, each turn on the lights, light all the time maintaining the brightness of the previous lights. 5. Can directly replace the conventional switch without having to change the interior layout, easy to use. But this was no remote control switch circuit, the authors draw a circuit diagram according to kind, is made available to the general electronic enthusiasts, or maintenance information.

1. Remote control transmitter. Transmitter circuit shown in Figure 1. It is encoded by the universal infrared remote control transmitter IC PT2248 composition. The oscillation client is included 500kO resistor, external ceramic filter or just a series resonant LC circuit so the circuit can oscillate, in Figure 1, X1 is 455kHz ceramic filter. PT2248's ~ foot ~ feet constitute a keyboard matrix, the remote control switch of which only four keys, and marked with the numbers 1,2,3,4, respectively, control four receiver. Control signal output from the pin, after Q2, Q1 amplified drive out infrared emitting diodes D1 launch remote control signal.

2. Remote control receiver circuit. Remote control receiving circuit shown in Figure 2. IC3 and the Q1 component infrared receiver and preamplifier circuit, IC3 use universal infrared receiver HS0038, it receives infrared signals from the circuit, and signal amplification, detection, filtering 38kHz carrier frequency and so on.

IC1 decodes the infrared receiver integrated circuit for common PT2249. Application, only in its external oscillator input pin parallel RC, you can make the circuit oscillate. IC3 output from the infrared remote control signal amplified by transistor Q1 input to the input pin IC1, IC1 internal circuit for shaping the input signal first and then the data validation, user code inspection, error inspection. The inspection is correct, the corresponding output goes high. ~ Pin IC1's output signal, the circuit of which only four outputs, and marked with the numbers 1,2,3,4, respectively, with the band switch K1 for conversion. Only when the number of remote control transmitter button and the remote receiver the same number of band switch, remote control signal fishes dimming circuit work.

IC2 is dedicated dimming circuits CS7232. IC1 output signal by the band switch K1, diode D4 input to IC2 of the high signal input pin to control the output pin of the trigger pulse signal, the diode D5 control the triac conduction angle and SCR1 on / off. When the remote control transmitter command signals sent time of less than 0.32 seconds, IC2 control SCR1 to achieve switching function, and when the remote control transmitter command signal sent when the time is greater than 0.32 seconds, IC2 dimming control SCR1 function, that is, the light from bright to dark, and then from dark to light dimming for recycling, cycle time is about 8 seconds a week, when transferred to the brightness of satisfaction when you can release the button. R7 in Figure 2 provides for the synchronization signal IC2 feet. C7 spike interference filter. For the PLL filter capacitor C2. D5 is a bidirectional thyristor SCR1 trigger signal. K2 to manual control switch, the control action and control of the remote control transmitter button the same effect.

C1, R6, D1, D2, C5 constitute a capacitor step-down, rectifier, filter, regulator circuit. D6, R8 constitute a power indicator circuit, when the remote control switch in the off state, D6 lit, turn off when the D6.

The remote control switch suitable for conversion homes, offices, hotels, hotels and other places of lighting equipment. I will use this room chandelier room remote switch control, the effect is very good.