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Logic Probe #2

1) Touch the probe to the 5V source. What happens? 

You read "1" on the LED.
2) Touch the probe to the source ground. What happens?
You read "0" on the LED
3) Can you decide what would happen if a digital pulse were applied to the probe?
It would switch between "1" and "0".
Explain how this works?
 If the current is high, you read "1", if the current is low, you read "0".

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