Proximity alarms are common in security systems, automation, and home projects. But when running on low voltage (like 3.3V or 5V), powering them efficiently without false triggers or under-voltage issues can be tricky for Indian hobbyists and engineers.

🔧 The Problem: Unstable or Low Power Supply

Most proximity sensors and alarms need clean, regulated voltage to work reliably. If the power supply dips—especially when battery-powered—it can cause false alarms or even damage components.

✅ The Solution: Regulated Power and Decoupling

Use a low dropout (LDO) regulator or a DC-DC buck converter to stabilize your voltage. Add decoupling capacitors (e.g., 100µF electrolytic + 0.1µF ceramic) close to your sensor or alarm module to filter noise and improve stability.

🔍 Practical Example: Battery-Powered Door Alarm

Imagine building a 3.3V IR proximity alarm powered by a lithium cell. The voltage drops to 2.9V during loud buzzer activation, causing false triggers. You fix this by adding a DC-DC boost converter to maintain a stable 3.3V output even as the battery discharges.

🧮 Sample Calculation: Power Budget

Sensor = 10mA, Buzzer = 80mA
Total = 90mA
At 3.3V:
Power = V × I = 3.3V × 0.09A = 0.297W
Choose a power supply rated for at least 0.5W to add margin.

🛒 Product Suggestion: Made in India Components

• 🔋 [Shop DC-DC converters]

• 🔌 [Shop LDO regulators]

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