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Analog signal amplifier with OpAmp, Transistor or Darlington Pair?

happydays

Jan 13, 2023
1
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Jan 13, 2023
Messages
1
Hi all,

Looking for some advice please, I’m looking to modify the volage output signal of an engine sensor range from 1.5-3.5v to 1.5 to 4.5v range. The sensor has a regulated 5v supply, however also provides power to 2 other amplified hall type sensors so keen any amplifier for this circuit has minimal current draw.

The sensor provides positional info for the ecu, so assume the signal will just be feeding a A-D converter.

Any advice or circuit guidance would be much appreciated?

Thx
 

Kabelsalat

Jul 5, 2011
177
Joined
Jul 5, 2011
Messages
177
From the headline, opamp is the obvious choice. A non-inverting amplifier with 1.258'ish amplification and in the opamp amplifier circuit, you need the local ground having stabilized 1.5V as well.
That is, you need as well as a good opamp circuit (not like the old 741)
-> Accurate set of resistors in order to gain accurate gain.
-> Voltage stabilizator and accurate resistors to get excactly 1.5V.
 

kellys_eye

Jun 25, 2010
5,296
Joined
Jun 25, 2010
Messages
5,296
Seems a bit of a stretch to believe that the voltage 'as is' can't be used as-is...??? Can you elaborate on the need to do this?
 

crutschow

May 7, 2021
550
Joined
May 7, 2021
Messages
550
I posted this previously, but it seems to have disappeared.
It uses an op amp with a non-inverting gain of 1.5 and a negative offset of 0.75 volts to get the desired output.
The op amp can be just about any rail-to-rail type.

1673711647256.png
 

Ylli

Jun 19, 2018
383
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Jun 19, 2018
Messages
383
DIdn't disappear, its just over on ETO. :)
 
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