NOT gate with relay coil and normally closed contact.

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NOT gate with relay coil and normally closed contact.

The idea is to invert the input signal by using a normally closed contact to feed the relay coil. A NOT gate is achieved because the coil ends up energizing only when the input is false, and de-energizing when the input is true. With the input low, the normally closed contact is closed, allowing current to flow to the coil and energize it. When the input goes high, the contact opens, cutting current to the coil and causing it to de-energize. The relay’s output (which is driven by the coil’s state) then follows the inverse of the input: coil on for false input, coil off for true input. Using a normally open contact would not produce this inverted relationship in the same wiring, so the normally closed path is what creates the NOT behavior.

The idea is to invert the input signal by using a normally closed contact to feed the relay coil. A NOT gate is achieved because the coil ends up energizing only when the input is false, and de-energizing when the input is true. With the input low, the normally closed contact is closed, allowing current to flow to the coil and energize it. When the input goes high, the contact opens, cutting current to the coil and causing it to de-energize. The relay’s output (which is driven by the coil’s state) then follows the inverse of the input: coil on for false input, coil off for true input. Using a normally open contact would not produce this inverted relationship in the same wiring, so the normally closed path is what creates the NOT behavior.

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