Engineering Difference between external and internal circuit?

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The discussion clarifies the distinction between internal and external circuits in electronics. Internal circuits refer to the fixed components within an integrated circuit, such as a 555 timer, which cannot be altered. In contrast, external circuits consist of additional components connected to the integrated circuit, allowing for modifications to achieve different functionalities, like varying frequencies. Understanding this difference is crucial for effectively utilizing integrated circuits in various applications. Overall, internal circuits are static, while external circuits offer flexibility for customization.
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what is the difference between external and internal circuit?
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Do you mean what is the English meaning of these words?

As an example, you might have an integrated circuit called a 555.

This has a lot of components inside it and it needs a few extra components to make it work as an oscillator.

The ones inside it cannot be changed and these are called the internal circuit.

The ones outside the chip are ones that you supply and these can be changed to get different frequencies. This collection of components and how they are connected is called the external circuit.
 

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