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Transmission of serial data characters

On a serial data link characters are transmitted data rate of 9600 baud. if characters are 8 bits and there is one start bit and one stop bit per character, then what is the number of characters ...
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How fast should I feed 74HC164 for driving LEDs?

I want to ask about bitrate for 74HC164. I want to drive LEDs with it. Circuit will be similar to this: How fast CLK rate / bitrate can I use in this circuit? I know that LEDs have some capacitance.