Reverse Voltage Protection for Displays
⚠️ The Problem :
Displays like OLEDs and LCDs are often the most delicate components in any electronics project. A reverse voltage connection—accidentally swapping the power supply leads—can instantly destroy the display. This is a common mistake during prototyping, especially for beginners.
✅ The Solution
The simplest and most effective fix is to add a reverse voltage protection diode in series with the VCC line or a P-Channel MOSFET reverse polarity protection circuit. These act like one-way valves, ensuring current flows only in the correct direction.
🧰 Practical Example
You’re building a battery-powered temperature monitor with an OLED screen. During testing, you accidentally reverse the battery polarity. Without protection, the OLED can get fried instantly. By placing a Schottky diode (e.g., 1N5819) between the power source and the display, the diode blocks reverse current, saving your screen.
📐 Sample Calculation
Assume your OLED runs at 5V, drawing 50mA.
Using a Schottky diode with a 0.3V drop:
Power Loss = Voltage Drop × Current = 0.3V × 0.05A = 0.015W
This is minimal—your display remains safe, and efficiency is barely affected!
🛒 Product Recommendation
Use Made in India components for reliable protection:
[Schottky Diodes (1N5819, etc.)]
🛍️ Shop now at SmartXProKits.in
🇮🇳 Support our work and India’s innovation—buy from our Make in India site!
