Hi Ashish-We'll be happy to help, but please give us a bit more to go on. What kind of sensor? PH? ORP?What output voltage range do you need? Do you need temperature compensation?Some electrochemical sensors produce voltages that can be either polarity relative to ground. The signal conditioning amplifiers can often be simplified if it is permissible to offset the shield of the sensor away from ground. Does your sensor's voltage fall into this category?-Rick .
Ashish, as it happens a couple of days ago I was sent this link to an article by the legendary Bob Pease: What's all this Transimpedance Amplifier stuff, anyhow? Like all of Bob Pease's stuff, it is worth a read and may help you in your design.
thanks Rick Sir and David Sir for quick responsesensor is TGS 5042 CO gas detector, output voltage range( 0 to 5v) and temperature compensation is needed
Ashish
Have you thought how you are going to test your circuit? Have you got a CO source? How will you vary it to test your design (from 0 to 5V output)? That is to say nothing of generating the different CO values at different temperatures (since that very equipment may also have to operate at the elevated/reduced temperatures as well as your design)? Don't forget the safety for yourself and others since as you know, CO is poisonous.I am afraid I don't know the answers, but I have learned that designing is one thing- testing in order to prove your design can be a whole lot more complicated.
Sir , I does not have a cylinder of CO gas for testing, I will check presence of CO near burning coal or waste at outside the room or grass field. I just want to make air quality detector circuit.
The discussion focuses on designing a high precision linear trans-impedance amplifier to amplify the output signal of an electrochemical sensor, specifically the TGS5042 CO gas detector. The sensor output voltage range is 0 to 5 V, and temperature compensation is required. Key considerations include the sensor type, output voltage polarity, and the possibility of offsetting the sensor shield from ground to simplify signal conditioning. Reference is made to the TGS5042 datasheet, which contains a schematic useful for design guidance, as well as an evaluation module schematic. Testing challenges are highlighted, including the need for a controlled CO source to validate the amplifier's response across varying gas concentrations and temperatures, with safety concerns noted due to CO toxicity. The user plans to detect ambient CO levels near burning coal or waste as a practical test environment. Summary generated by the language model.
