You can also watch this video on YouTube https://youtu.be/9iCUwS8cW5U In this video NTC Thermistor Fan Control Circuit, Fan Speed Control Circuit using NTC Thermistor. I explained how to control dc fan speed using 10K ntc thermistor and a npn transistor
Indeed Creating an NTC Thermistor Fan Control Circuit is a great way to learn about temperature control and electronics How NTC Thermistor Fan Control Circuit Works: An NTC Thermistor (Negative Temperature Coefficient) decreases resistance as temperature increases. The thermistor forms a voltage divider with a fixed resistor. As the temperature rises, the voltage at the thermistor decreases. This voltage change controls the base of an NPN Transistor (acting as a switch). When the temperature gets high enough, the transistor turns on, powering the fan. Components Needed: NTC Thermistor (10KΩ TTC103 6D3) NPN Transistor (e.g. 2SC1815, 2N2222 or BC547) Fan (12V) Resistors (509 ohms) Power Supply (12V based on components) You can use Breadboard & Jumper Wires. or directly soldering on prototype veroboard Applications: this NTC Thermistor Fan Control Circuit can be used for Automatic cooling systems, Temperature-controlled fans, Overheating protection
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