This circuit shows you how to build a secret code lock! Instead of a key, you use a special code to unlock something, like a box or a door. Circuit Working: Parts List: Component Quantity Notes Resistors (1/4 watt) 1k 2 Semiconductors Transistor BC547 1 Diode 1N4007 1 Relays 1 Mini switches (ON/OFF) 8 This […]
Security and Protection
Simple PIR Motion Sensing Security Light Circuit
This is a fun electronics project for a hobbyist. It is a security light that uses a special sensor. Regular light switches turn the light on and off manually. This light is different it has a motion sensor. The sensor detects movement like someone walking by. When there is no movement the light stays on […]
Simple Self Discharge Battery Protection Circuit
This article shows you how to build a simple circuit to protect a car battery lead acid battery when it is not being used. The circuit helps the battery stay charged for longer and keeps it healthy. Building circuits with car batteries can be dangerous. Experiment with adult supervision or someone who knows how to […]
Simple Room Ionizer Circuit
A room ionizer is a gadget that helps clean the air you breathe inside. It works by creating tiny electrical particles called ions. These ions stick to dust, smoke and other icky stuff floating around in the air. To make these ions the ionizer uses a special trick with electricity. It creates a strong difference in electrical pressure […]
Simple DC Over Voltage Protector Circuit
A DC Overvoltage Protector circuit is designed to safeguard electronic devices or circuits from damage caused by excessive voltage levels in a DC power supply. Such circuits are crucial in various applications where stable and controlled voltage levels are essential. Circuit Working: Parts List: Category Component Value/Type Quantity Preset 2.5k 1 Semiconductors SCR BT169 1 […]
220V Over Under Voltage Cut Off Circuit Using Transistors
You might be surprised to learn that an effective circuit for the mentioned protections can be constructed using just a pair of transistors and a few other passive components. What is a 220V Over Under Voltage Cut Off Circuit: A 220V over under voltage cutoff circuit is a protective electronic circuit designed to monitor the […]