The nanomouse does not see where it is going; it relies on tactile sensors, each with a discrete circuit.

This can be made much smaller than a discrete circuit made from independent components.

There are two main advantages of ICs over discrete circuits: cost and performance.

Furthermore, much less material is used to construct a packaged IC die than to construct a discrete circuit.

These discrete circuits consumed much space and power and were limited in speed, although they are still common in some applications.

Has a boundary comprising discrete circuits, such as a polygon with a hole in it.

The envelope may be a discrete circuit or module, or implemented in software.

This may be done with an operational amplifier, as shown below, or with a discrete circuit.

They can be made up of either discrete or integrated circuits.

That said, some discrete circuits (such as power amplifiers) also employ direct coupling to cut cost and improve low frequency performance.