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Somebody was teaching me electronics over the internet. I don't know if he is a native English speaker or not.

He said: "To see more realistic effects, try using a clamping diode from the non inverting input to ground. That will ensure that the input is not driven to a non spec'd value which would actually blow out a real chip".

What is the meaning of the word "spec'd" ?

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    I'm not an expert, but probably it is "non-specified". – CowperKettle Feb 8 '16 at 9:24
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Spec is shorthand for specifications which are written descriptions for how an instrument or piece of equipment is used. In your example, a non spec'd value is a value which falls outside the normal operating range as described in its specification.

If the value is too high the chip will burn out, or the equipment will fail.

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    In this case "Spec'd" comes from "specified", to mean "as written in the specification" . – Cronax Feb 8 '16 at 15:10
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The word spec is often used in place of specifications, and spec'd is sometimes used to mean, "to provide specifications for", essentially, specified.

From the context you provided, it appears to be referring to the input voltage exceeding that for which a real "chip" would be rated.

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