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Diode logic doubt (digital circuit)
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[QUOTE="berkeman, post: 4532555, member: 8921"] Okay, maybe the mixing of voltage levels and logic levels is what is causing the problem. Think of the "logic 1" inputs as 5V voltage supplies, and logic 0 inputs as grounding out the inputs. When you apply 5V to either input, that causes a current to flow through the diode and through the resistor to ground. There is about a 0.6V drop across the diode, so that means that there is a 4.4V drop across the output resistor. With normal logic levels, that 4.4V still qualifies as a logic 1. If there is no voltage source driving the resistor through the diodes, then there will be no voltage drop across the output resistor, and that will be seen as a logic 0. [/QUOTE]
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Diode logic doubt (digital circuit)
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