[SOLVED] How to amplify low DC signal with OPamp?

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vecky

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Hi, I have a low DC signal about 0.4V and want to amplify to about 1-2V the current is not essential but must have enough strenght to move uA.

Thanks!
 

cameo_2007 said:
have you heard of operaional amplifiers? (LM741)
you may use that..
Click to expand...

But preferably something more modern than a 741

Keith.
 

oh yes, why not.
thought I'l suggest to start with a veteran.

TI's Instrumentation Amps like INA121,122's should do a good job.. and even more options can be found if one browses through https://www.ti.com/
 

cameo_2007 said:
oh yes, why not.
Click to expand...

Because they have a rubbish input/output voltage range and won't run from 3V or 5V which is what most people are likely to be using nowadays.

Keith.
 

Hi vecky,
What is your supply voltage & load resistor/current pls?
K.

Added after 33 minutes:

If you has a simple DC-signal (not on HV or line...); refer pls at https://en.wikipedia.org/wiki/Op_amp to "Basic single stage amplifiers, Non-inverting amplifier".
Gain is 1+R2/R1, with i.e. 3.3K as R2 & 1K =R1 you have it as a noninverting amp, as one possibility...
I would select a modern CMOS or BicMOS OP (TI, Maxim, Micrel, NI, ON Semi...) with rail to rail I/O.
K.
 

Thanks Everyone on answering I need that for one unimer which output is on uA with voltage in range of 0V-1V and range 100 Ohms-0 Ohms but I want to amplify the range of 10 Ohms- 0 Ohms and How?
I though the in serial put one fast diods with voltage drop about 0.4V and thats fine I measured thats work fine. I need something to amplify that signal after that on 1V. and if that go fine it means that I can go further in 1 Ohms- 0 Ohms. But I am not sure on precission after all of that.
What do you think?

If ok some picture of amplifer will be ok.
 

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