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this is a simple and inexpensive logic probe, which uses readily available components.
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principle of operation :
when the probe is brought to logic "0", current passes through the top led through the higher 470-ohm resistor.
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principle of operation :
when the probe is brought to logic "1", current passes through the top led through the higher 470-ohm resistor.
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the maximum design current of 10 milliamps through each led is assured by the 470-ohm resistor.
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