DIY Analog Thermostat: Build with NTC for Home Comfort!

When it comes to temperature control, having a reliable and versatile tool at your disposal can make all the difference. One such tool is a thermostat circuit with an adjustment range of approximately 0°C to 60°C, making it suitable for various applications such as aquariums, boilers, and more.

Featuring a simple and small-sized analog design, this thermostat circuit offers the flexibility to drive external loads through a set of NO-NC contacts of a relay. By utilizing the Normally Open (NO) and Normally Closed (NC) connections, you can easily control heating devices or regulate cooling systems with fans or air conditioning units.

The core of the thermostat circuit lies in the operational amplifier IC1, which functions as a comparator to monitor the voltage difference between the NTC sensor connected to terminal block X1 and a voltage divider comprising resistors R2 and R8. By adjusting the reference voltage at pin 2 using trimmer R8, you can set the desired thermostat trip temperature with precision.

Negative Temperature Coefficient (NTC) thermistors play a crucial role in the functionality of the thermostat circuit. These thermistors exhibit a decrease in resistance as temperature rises, making them ideal for a wide temperature range of -100°C to 450°C. Known for their high sensitivity and rapid response time, NTC thermistors offer exponential trends in their transfer curve, which can be effectively linearized by incorporating bias resistors in series and fine-tuning the circuit with parallel resistor values.

For a detailed overview of this innovative project and to explore the complete project description, be sure to delve deeper into the technical specifications and practical applications of this custom thermostat circuit. Whether you are a hobbyist looking to enhance your temperature control setup or a professional seeking a reliable solution for industrial applications, this thermostat circuit offers a versatile and efficient solution for your needs.