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Use the reference schematic below.
Pin No.5(signal INPUT) is OPEN.
But LED is lights up.
Please tell me the reason and how to improve.
Hello,
Input signal at pin 5 is not supposed to be left floating/open and it should always be driven with a voltage level. This is a high impedance input and if left floating, any noise/residual signal has the potential to cause erratic behavior of the LEDs.
Kind Regards,
Liaqat