555 advertisement decoration light controller circuit

Published:2011/5/22 7:19:00 Author:TaoXi | Keyword: advertisement, decoration light, controller circuit | From:SeekIC

As the figure 17-59 shows, the controller is composed of the pulse generator, the frequency divider, the matrix circuit and the SCR control circuit. We can achieve three kinds of combination change state by controlling the three groups of color lights. The astable multivibrator is composed of the IC1 and R1，R2，C1, the oscillation frequency f=1.44/(R1+2R2)C1, it is about 4Hz. The trigger which is composed of the IC2 and R3，R4，C2 outputs the square-wave A's half wave to the IC1, as the B of figure (b) shows. The waveform relationship between Y1，Y2 and Y3 is as shown in figure (c). By changing the logical combinations of the matrix, we can get more change forms.



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