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  • [[File:555 internals.gif|frame|right|Figure 1 - the internals of the NE555N timer chip connected to Figure 3 shows the complete schematic for the control logic and the fan. 555 is the timer chip. D1 and D2 control which section of the potentiometer P1
    9 KB (1,606 words) - 01:11, 1 July 2013