Building LM35 4 Channel Amplifier Board

In this article,I will explain how to assemble the 4 channel LM35 amplifer board we made.

This instructable requires that the user is comfortable operating and using a soldering iron.

Reading resistor Colour codes or using a multimeter to find out the resistor

• DIY 4 Channel LM35 Analog Sensor Amplifier for microcontrollers
• LM35 4 channel Temperature sensor Amplifier YouTube Video Tutorials

1. 100nF Ceramic Disc Capacitor
2. 10uF/16V Electrolytic Capacitor
3. 1N5819 Diode
4. 10K Resistor
5. 27K Resistor
6. LM324A DIP-14
7. PCB
8. LM35
9. Shielded Wire
10. Heat shrink tubing
11. Soldering Iron

We will build the power supply section consisting of C5,C6 and D1 first.

After the components are soldered ,

Check whether power supply available through out the board  

Here we will solder the LM324 IC for amplifying the signals from LM35 temperature sensor.

The output of the LM35 which will be few 100 milli volts will be amplified to a scale of 0-5V by LM324 opamp IC .

This circuit can be used for precision temperature measurement using LM35 and a microcontroller like Arduino,ATmega328P etc. 

We will use 2 core shielded wire to connect LM35 to the opamp section.

The shielded wire reduces Noise in the LM35 analog sensor and improves the accuracy of the device.

The  shield of the cable should be connected to ground.

we learn how to build a LM35 temperature probe from scratch for our LM35 amplifier board