LED landscape lighting circuit design

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 LED landscape lighting is to achieve RGBLED of alternating light and gradient control, circuit design shown in Figure 1. This circuit uses a 3181 chip as the controller and its related functions and pin see [4], control a total of 36 low-pow er LED The RGB tri-color downlight led 12, the driver program uses capacitance buck.

Where, C1, C5-parallel two identical capacitors, since the step-down and limiting the role; 4 lN4007 composition of the rectifier bridge input AC voltage is rectified; filter capacitor C4 is used to filter the rectified output voltage in exchange elements, and thus the voltage smoother; stable Schottky diode VD5 a voltage; VD6 control IC to provide a stable voltage for the current limiting resistor; R2, C2; R3, and R4 for the control IC to provide the AC input frequency for the integrated IC AC sampling frequency; transistor VT1, VT2, the VT3 is used to control the LED current changes in slip.