Active electronics

The term "active" is almost synonymous with "batteries required."  There are many, many examples of devices in this category, but I will only go into a few representative examples here.

Preamps and Tone Circuits
A final word
The marketplace is incredibly varied, so there are more and wilder things than the few I have featured here in most of these categories.  Look around the web if you are interested in some particularly experimental devices.

If you notice any parts I left off this little primer, please email me.
Copyright Alexplorer.