🔧 The Problem: Accidental Reverse Polarity Can Kill Your Camera 

If you accidentally connect a power supply in reverse (i.e., swapping + and -), it can instantly damage sensitive camera electronics. This is especially risky during prototyping or DIY repairs where polarized connectors aren’t always used. Reverse polarity can destroy the voltage regulator, sensor, or microcontroller in your camera circuit.

🛠️ The Solution: Use a MOSFET-Based Protection Circuit 

Instead of a traditional diode (which drops voltage), use a P-channel MOSFET for reverse polarity protection. When wired correctly, it blocks current if polarity is reversed but allows normal flow with minimal voltage drop when connected properly. This method is more efficient and reliable—especially important for 5V camera modules.

🔍 Practical Example: Protecting a 5V ESP32-CAM Module 

Imagine powering your ESP32-CAM with a LiPo battery. A moment of inattention while soldering could reverse the connections. Adding a P-MOSFET at the input avoids catastrophe and keeps the camera safe even if polarity is reversed.

🔢 Sample Calculation :

If your load draws 300 mA and a diode drops 0.7V:

Power loss = 0.7V × 0.3A = 0.21W

Using a MOSFET with 30 mΩ Rds(on):

Loss = 0.03Ω × (0.3A)² = 0.0027W — over 75x more efficient!

🛒 Product Suggestion :

Browse MOSFET or camera protection parts made in India.

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