differential op amp - never done this b4

SimonFraser's picture

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Joined: Jun 12, 2020

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differential op amp - never done this b4
June 12, 2020 - 4:03pm

Hi

i am a total numpty for this, but do know which end of  a soldring iron to hold and how to take basic multimeter readings

i have a sensor output of 2.5 to 3.5 V DC

needs to be 0.5 to 4.5 V DC for a low current digital gauge

so i need to subtract 2.0 V from the input

and then multiply this by 4

as far as i understand i need a differential op amp for this, i have 5V to power this, or 13.0V from a battery / alternator

now i am stuck, how do i work out what parts i need and how to design the circuit ?

many tnx :)

 

 

SimonFraser's picture

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correction
June 12, 2020 - 4:09pm

correction

so i need to subtract 2.5 V from the input - obviously ...

 

Sourav Gupta's picture

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Need more info.
June 13, 2020 - 11:39am

Wait!! Why you need to subtract and multiply? What is your planning.

Juan Lanzagorta's picture

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sensor output logic levels
June 13, 2020 - 9:06pm

Your sensor output of 2.5 is a logic 0 and 3.5 is a logic 1?

Debashis Das's picture

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Hi
June 15, 2020 - 8:41pm

Please provide a proper schematic of the circuit with sensor specification/part-number.