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Topic: need a simple non-inverting op amp to convert 0->100mv to 0->5v (Read 186 times) previous topic - next topic

petraCCNE

which non-inverting op amp should i use that accepts low analog voltage input (0 to 100mv) and
output (0 to 5v and also with positive output) connected to analog input of arduino
and i don't want this little voltage to be understood like a noise to the op amp



(and please i want it to be very simple so i can easily connect it because i have no experience in op-amps )

ChrisTenone

Since you are minimally loading it, any rail to rail op amp should work. Well, what frequency response do you need - that is, how fast does the 0-100mV change?

I have used a TLV2462 for a similar application. Put a 1K resistor from minus input to ground, and a 47K from minus input to output. Put your signal into the plus input, like this:


Google "non-inverting op amp gain" to see how gain is calculated.
I'm not disparaging the differently abled. I'm stating the fact that thirty years of junior college has made me mentally retarded.

Wawa

OP didn't tell you that it's for a TGS 6812-D00 gas sensor, that needs a balanced instrumentation amp.
So the ground-referred amp diagram you have posted is invalid.

https://forum.arduino.cc/index.php?topic=550305.0

Leo..

ChrisTenone

Oh. I was going by their statement: "i want it to be very simple so i can easily connect it because i have no experience in op-amps". An "in amp" is considerably more complex than an op amp.
I'm not disparaging the differently abled. I'm stating the fact that thirty years of junior college has made me mentally retarded.

petraCCNE

So i must use a balanced instrumentation amp (hx711 for example)
And can't use any of the non-inverting amp?

Wawa

First ask a moderator to merge your cross-posting mess. All of it.
Nobody likes to reply to something that someone else could already have answered.
Use the "report to moderator" link that you can find at the bottom of any post.
Leo..

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