temperature sensor circuit using lm335

This design circuit is for a temperature sensor that utilizes an LM335 integrated circuit (IC) to convert ambient temperature into an equivalent output voltage. The output voltage of the LM335 increases by approximately 10 mV for every 1 degree Kelvin rise in temperature, which is equivalent to 1 degree Celsius. In this circuit, the output of the LM335 is connected to a 741 operational amplifier (op-amp), which can be replaced with any standard op-amp, configured as a voltage follower. The primary function of the op-amp is to buffer the output of the LM335, ensuring that the output signal remains stable and is not influenced by the load connected to the temperature sensor circuit. This circuit is suitable for measurement purposes.

The temperature sensor circuit employing the LM335 is designed to provide a reliable and precise measurement of ambient temperature. The LM335 operates by producing a linear output voltage that corresponds to the temperature in Kelvin, which can be directly interpreted in degrees Celsius for practical applications. The voltage output characteristic of the LM335 makes it particularly useful in temperature sensing applications where accuracy is crucial.

The inclusion of the 741 op-amp as a voltage follower is a critical design choice. By configuring the op-amp in this manner, the output voltage from the LM335 is buffered, thereby isolating the temperature sensor from any potential loading effects that may arise from subsequent circuitry. This buffering ensures that the voltage output remains consistent, regardless of variations in the load impedance, which is essential for maintaining measurement accuracy.

The circuit can be further enhanced by incorporating additional components such as resistors or capacitors for filtering noise, or by using a more advanced op-amp for improved performance. The output from the LM335 can be connected to an analog-to-digital converter (ADC) for digital processing, enabling integration with microcontrollers or data acquisition systems for more complex applications such as temperature monitoring and control systems.

Overall, this temperature sensor circuit is versatile and can be adapted for various applications, including HVAC systems, environmental monitoring, and industrial process control, where precise temperature measurement is required.This is a design circuit for a temperature sensor circuit that uses an LM335, an IC that converts the ambient temperature into an equivalent output voltage. The voltage output of an LM335 increases by approximately 10 mV for every 1 degree Kelvin of rise in temperature.

Note that 1 degree Kelvin is equal to 1 degree Celsius. This is the figure of the circuit; In this circuit, the output of the LM335 is fed into a 741 op-amp (any standard op-amp may be used) which is configured as a voltage follower. As such, the output of the 741 is the same as the voltage output of the LM335. The main function of the op-amp, therefore, is just to buffer the LM335 output so that it is not affected by whatever load is connected to this temperature sensor circuit.

This circuit can be used for measurement purpose. 🔗 External reference