This video demonstrates a temperature-controlled switch circuit using a thermistor (RT1) and transistor-based relay driver in Proteus Software. The circuit automatically activates a 9V motor when the ambient temperature exceeds a user-defined threshold, ideal for applications like cooling systems or overheating protection. Key Features: Thermistor (RT1): Detects temperature changes and adjusts resistance accordingly (resistance decreases as temperature rises). Transistor Pair (Q1/Q2): Amplifies the thermistor signal to drive the relay coil. Relay (RL1): Switches the 9V motor on/off based on temperature. Adjustable Threshold: Use RV1 to set the temperature limit (e.g., 12°C as shown in the simulation). Flyback Diode (D1): Protects transistors from voltage spikes during relay switching. How It Works: Temperature Sensing: RT1’s resistance drops as temperature increases → Voltage divider (R1 + RT1) sends a higher voltage to Q1’s base. Transistor Amplification: Q1 turns on → Activates Q2 → Relay coil energizes → Motor turns ON. Threshold Adjustment: RV1 fine-tunes the temperature at which the motor activates (e.g., 12°C in this simulation). What you’ll learn: How thermistors work and interface with electronic circuits. Role of transistors in signal amplification for relay control. Importance of flyback diodes in inductive load circuits. Simulating real-world temperature-controlled systems in Proteus. ⚠️ Safety Note: Always use isolation transformers and follow safety protocols when working with motors and relays. 🔔 Subscribe for more tutorials, and hit the bell for updates! Telegram channel link: Subscription Link: @electronicsimulation9618?sub_confirmation=1 🌐 Check out my other channels: @MAKERCREATIVE @OPENPCB @electronicsimulation9618 #ThermalSwitch #TemperatureControl #Thermistor #RelayCircuit #ProteusSimulation #ElectronicsTutorial #ElectronicProjects #EngineeringStudents #ElectricalEngineering #STEMEducation #BeginnerProject #StudentProject #ScienceProject #HowToBuildACircuit #LearnElectronics #RealTimeSimulation #CircuitAnalysis #PowerElectronics