555 water form color light control circuit

Published:2011/5/21 9:08:00 Author:TaoXi | Keyword: water form, color light, control circuit | From:SeekIC

As the figure 17-54 shows, the color light control circuit uses three 555 as the core, and the monostable circuit is composed of the 555, they control the SCR cycle conduction of different channels, so the color light turns on one by one, just like the water. When the pin-3 of IC1 has the high level voltage, SCR1 conducts, the light turns on. At the same time, pin-3's high level voltage charges C3 through R3, when C3's voltage is higher than pin-6's threshold level 2/3VDD, IC2 sets and outputs the high level voltage, SCR2 conducts, the light turns on, at the same time it charges the C5. 555 is the bipolar type, the driving current is up to 150mA.



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