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74HC595 8-Bit Shift Register Pinout . The 74HC595 is an 8-bit serial-in, parallel-out shift register IC that is commonly used to drive leds motor or any other electronic equipment.. PIN(Q0 - Q7) ...
When it's on, the circuit supplies almost exactly 8 mA to each LED. If it's desired to have both LEDs appear on, the port pin can be rapidly cycled between 0 V and Vcc.
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