LED Temperature Indicator Circuit using Thermistor and Transistors | Proteus Simulation
In this video, I have designed and simulated a Temperature Indicator Circuit using LEDs, Thermistor, and Transistors in Proteus.
This simple electronics project works like a basic thermometer without a digital display, where LEDs light up according to temperature changes.
When the temperature increases, more LEDs turn ON, visually representing the rise in temperature — making it perfect for learning temperature sensing and analog electronics.
🔧 Circuit Explanation:
The NTC thermistor changes resistance with temperature.
A pair of 2N4401 transistors amplify the sensor signal.
Zener and signal diodes (1N4148, 1N4728A) control threshold voltages.
Different LEDs (Red, Green, Yellow) indicate temperature levels.
Powered by a 9V DC supply.
💡 Applications:
Simple temperature indicator system
Thermal alarm and monitoring projects
Educational simulation for electronics students
📘 Components Used:
Thermistor (NTC), Transistor (2N4401), Diodes (1N4148, 1N4728A), LEDs, Resistors, Potentiometer, 9V Battery
🎯 Watch till the end to understand how the LED temperature indicator works and how to simulate it properly in Proteus.
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