In this video, we show you how to build a mini amplifier circuit using a 3.7V battery, LM7805 voltage regulator, and a 3.5mm audio jack input. This simple setup can drive a small speaker directly from a phone or MP3 player!
🔧 Main Components:
LM7805 Regulator
1KΩ Resistor
220uF 16V Capacitor
3.5mm Audio Jack
3.7V Li-ion Battery
Small 8Ω Speaker
📌 This circuit works well for basic portable speakers, DIY audio toys, or learning projects. Clean and minimal components for easy building!
⚠️ Note: Output power is limited. For more volume, pair this with a transistor or amplifier IC.
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