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Combination Logic Tutorial

Diode Logic Tutorial

In the AND circuit, the cathodes are held low by the "pull down" resistors.

The diodes are forward biased and the output is held low.

If two of the diodes are taken high to reverse bias them, the remaining diode still holds the output low.

A and B and C must all be taken high to make the output go high.

Diode Logic Diagram

In the OR circuit, both anodes and cathodes of the diodes are held low, and the output is low.

If A or B or C is taken high, then the associated diode is forward biased and the output goes high.

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