Op Amp Basics - Operational Amplifiers are one of the fundamental building blocks in electroincs, especially in audio circuits. Learn how these mighty wonders function so that you too can use them.

Unregulated Power Supply - Nearly every circuit needs a power supply in order to function. Unregulated supplies are the most simple types of these. Find out what they are all about and how you can make one as well.

Filter Basics - Learn what is meant by Low-pass, High-pass, 2-pole, notch and more. Filters abound in audio electronincs so brush up on what they are and how they work.