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555 Sinking Current - How? 555 Sinking Current - How?
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Old 9th April 2008, 03:38 AM   (permalink)
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Originally Posted by ParkingLotLust
How do I find out the current? I dont know the value of the resistor pulling the signal line to 5v.
The base current for a switching transistor is simply 1/10th its collector current.

The collector current is determined by the load resistance and the supply voltage minus the 555 output voltage loss.
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