A 9V battery works, but a basic variable DC power supply (0–30V) is the "stove" of your electronics kitchen. 2. The Appetizer: The Crystal Radio
Here is a curated "menu" of essential projects and tips to kickstart your home lab. 1. The "Must-Have" Kitchen Tools
A long wire antenna (20+ feet) and a high-impedance earpiece.
Your eyes and ears. If a circuit isn't working, the DMM tells you where the voltage stopped flowing.