Mod: Link to earlier Thread: https://forum.allaboutcircuits.com/threads/varying-differential-signals.165602/post-1459262
Hi,
Sorry but i think this post is related with my consult,
How i can configured Lm324 opamp single polarity (+5v) for this:
input +0.5v to +0.4v
output +5v to 0v
Thanks for yours response in advance..

 

Start with finding G required-

G = (5 - 0) / ( .5 - .4) = 50

The use linear equation

y = mx + b where m = G, and b = offset

Solve for b....

And pick Rs.

This might help -

http://www.ti.com/lit/an/sloa030a/sloa030a.pdf

https://www.analog.com/en/design-center/interactive-design-tools/adi-diffampcalc.html


Regards, Dana.

 

keeping in mind the LM324 has not the rail to rail output - it likely goes up to (Vcc-1.4V) ... ((Vcc-1.25V)) and down to Vee+600mV
. . . the linearity and stability near those limits may pose a problem -- e.g. -- you need to have adequate ±Supply margin for your output amplitude and frequency
, also -- it's an PNP input stage so it likely won't get along too well with input( voltage)s near the Vcc
unless it's LMV324 (versus LM324)

 

Thank you for your answers.I think i found the solution and i'm trying on lm324
differential, i not need precision only convert my real input +52v to +46v to
+5v to 0v.I need not read on analogue voltmeter 0 -50v i need full scale on
0 - 5v and that way being able to read on the move aboard my DIY ebike prior
to cut off from BMS.
Best regards

 

BTW,will there be an example circuit that simply change the slope
of the output curve of an opamp not inverter?

 

The ap note posted earlier has solutions for non inverting circuits.

https://www.ti.com/lit/an/sloa030a/sloa030a.pdf


Regards, Dana.