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HowTo: Understand the 74HC595  (David Caffey)

Step 4 : Wiring Schematic

The Triac drivers use the 5 VDC output signal from the 74HC595 chip outputs (Q1, Q2, Q3, Q4, Q5, Q6, and Q7) to switch the 110VAC gate signal to the Triacs. The Triacs switch the 110 VAC signal that turns the power ON and OFF to the string of lights.