Designing and building an audio amplifier circuit using operational amplifiers (op-amps) is a great electronics project. In this example, we will create a non-inverting amplifier circuit using a commonly used op-amp, the LM741. This circuit will take an audio input signal and amplify it, making it suitable for driving headphones or small speakers. Here’s how to do it:
Components you’ll need:
LM741 op-amp Resistors (two different values, e.g., 10k ohms and 1k ohms) Capacitors (e.g., 10 µF electrolytic capacitor) Audio source (e.g., a smartphone or MP3 player with a 3.5mm audio jack) Breadboard and jumper wires Headphones or a small speaker Power supply (e.g., 9V battery) Circuit Diagram: