If you’ve looked at my other posts, you’ll notice I’ve added schematics. While I won’t do them for every post, where possible (and needed) I’ll try to add them.
The tool I use by the way is a free one: ExpressPCB from the company of the same name. They offer it so you can design PC Boards, which they can then produce for you. However, the schematic half o f the program is perfectly usable even if you don’t want to do PC boards – as my examples showed.