Hello everybody, I'm taking a look at this schematic which represents a controller for a 16x8 RGB LED matrix. I can't understand why there are pull-up resistors at the output of the 74HC138 since this component is not an open collector type. Firstly I thought that they invert the 138 output signal (…

What's the purpose of these pull-up resistors?

system September 12, 2012, 7:54pm 7

I got your point, thanks for the explanations!

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