Radio And Electronics Cookbook ★

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

A long wire antenna (20+ feet) and a high-impedance earpiece. Radio and Electronics Cookbook

Add a 10µF capacitor between pins 1 and 8 to "crank the gain" from 20 to 200. 4. Dessert: The "Sixty-Second" Wire Antenna A 9V battery works, but a basic variable

It teaches you the fundamentals of resonance (tuning) and rectification (turning radio waves into sound). 3. The Main Course: The LM386 Audio Amplifier A 9V battery works