Low Cost Reverse Polarity And Over Current Protection (corrected) Info

This circuit provides a robust, low-cost solution for protecting sensitive electronics from two common killers: accidental battery reversal and excessive current draw. By using a P-Channel MOSFET instead of a standard diode, you achieve high efficiency with minimal voltage drop. 🛠️ The Core Components

) rating is higher than your input voltage. If not, use the Zener diode to clamp it. This circuit provides a robust, low-cost solution for

Protects the MOSFET Gate from high voltage spikes. If not, use the Zener diode to clamp it

If current exceeds the limit, the PTC heats up rapidly, its resistance spikes, and it effectively "opens" the circuit until the fault is removed and it cools down. 📐 Circuit Design Value/Part No. Q1 P-Channel MOSFET Reverse Polarity Switch F1 PTC Resettable Fuse Over-current Protection D1 10V - 15V Zener Gate Over-voltage Protection R1 10kΩ - 100kΩ Gate Pull-down 💡 Key Advantages 📐 Circuit Design Value/Part No