This example illustrates the use of PROC NETDRAW to draw two networks that represent different schematic flows ... to specify the text that is to be placed within each node. The flow diagram is shown ...

it’s great for a quick-and-dirty circuit diagrams. Not exactly schematics, but [Duckman] has some Arduino pinout diagrams he made using ASCII-art. These could be useful when pasted into source ...

We’d wager that, if you’re reading Hackaday, you’ve looked at more than a few circuit diagrams in your day ... Here’s an example circuit (from the documentation): import Resistor from ...