555 mobile light program controller circuit

Published:2011/5/21 8:30:00 Author:TaoXi | Keyword: mobile light, program controller | From:SeekIC

As the figure 17-55 shows, the program controller is composed of the clock generation circuit, the logic circuit and the SCR control circuit.etc. And this circuit can be used in the program control of the advertising lights and mobile lights. The astable multivibrator is composed of the 555 and R1，RP1，C1. The oscillation frequency is adjusted by the RP1, the frequency range is between 0.5Hz to 45Hz. And this astable multivibrator is used to control the logic control circuit's cycle. The logic circuit is composed of the 4-D trigger 74LS175 and the switches such as AN1 and AN2. Every D trigger of 74LS175 has independent data input port D and output port Q. When you open the power supply switch K1, and the mode selection switch K2 is in the position 1 , and then you press AN1 to make K2 to 0, the output ports 1Q，2Q，3Q and 4Q all have the low level voltage.



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