🔁 The Problem: Reverse Current Can Damage Audio Circuits

In audio systems—especially amplifiers and Bluetooth modules—reverse current can flow when the power supply is suddenly disconnected or if there’s back-EMF from speakers. This can fry your sensitive components like op-amps or audio processors. For DIYers and prototypers, this is a common headache when switching between multiple power sources.

🛠️ The Solution: Add Reverse Current Protection

A simple and effective fix is to use a Schottky diode or a P-channel MOSFET to block reverse current. These components ensure that current only flows in one direction—protecting your circuit from accidental damage without affecting audio quality.

🎧 Practical Example: Protecting a Bluetooth Audio Module

Let’s say you’re building a 12V battery-powered Bluetooth speaker. If you plug in a second power source (like a solar charger) without proper isolation, current can flow backward and damage the module. Adding a Schottky diode at the power input prevents this.

🧮 Sample Calculation: Choosing the Right Diode

For a 12V, 2A audio system:

• Power = Voltage × Current = 12V × 2A = 24W

• Choose a Schottky diode rated at at least 3A, 20V, and with a low forward voltage drop (e.g., 0.3V)

This ensures efficiency and reliable protection.

🛒 Product Suggestion: Made in India Components

Looking for reliable components? Check out these Made in India essentials:

🔗 Schottky Diode

🔗 MOSFET

👉 Shop now at SmartXProKits.in
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