Earthquake Sensor using SR Transistor Latch circuit. #diyprojects

🔔 Earthquake Alert System Using Bistable Flip-Flop | Transistor Based Latching Alarm In this video, I have made a simple but very effective Earthquake Alert System using a bistable (flip-flop) circuit with transistors. This project is fully analog, low-cost, and easy to build at home. Earthquakes occur suddenly and without warning. A latching alert system like this is important because once vibration is detected, the alarm stays ON until manually reset, ensuring that no warning is missed. ⚙️ Circuit Explanation The core of this project is a bistable multivibrator (SR latch) made using BC457 / BC547 transistors 1N4148 diodes are used instead of LEDs inside the latch for: Signal direction control Circuit stability Protection from reverse feedback An extra BC547 transistor is used as a driver stage to safely operate: Buzzer Indicator LED This driver transistor increases current and isolates the latch circuit so the alarm works reliably. 🚨 How It Works Vibration or trigger signal activates the circuit The bistable circuit changes state One transistor latches ON Driver transistor activates buzzer and LED Alarm remains ON even after vibration stops Alarm turns OFF only when reset manually This makes the circuit ideal for earthquake alerts, safety alarms, and warning systems. ✅ Key Features ✔ Bistable (latching) operation ✔ No microcontroller required ✔ Low power consumption ✔ Simple and affordable components ✔ Alarm stays ON until reset ✔ Suitable for home & educational projects 🛠️ Components Used BC457 / BC547 Transistors 1N4148 Diodes Resistors Buzzer LED Power Supply Switch / Vibration trigger 📌 Applications Earthquake alert system Vibration alarm Safety warning system Educational electronics project ⚠️ Note: This project is for educational and experimental purposes. For real-world earthquake safety, always follow official guidelines and professional systems. 👍 If you like this project, LIKE, SHARE, and SUBSCRIBE to the channel for more simple and useful electronics projects. 🔔 Turn on notifications so you don’t miss new v