In my circuit pull-up resistor used to get high logic level if it possible tell me.?

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... 1. pull up resistors on the unused ... resistor on the used input from the sensor. Bad for circuit in ... to a logic high by this 20k resistor. - Read more

My plan is to use the circuit to drive 4x 0.3A 12v 120mm ... exactly, but it still gave me high pitched ... You have to add a pull-up resistor for each fan ... - Read more

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In my circuit pull-up resistor used to get high logic level if it possible tell me.? resources

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