Hi, I'm new to Op-amp's, I have seen Dave's video tutorials about them and learned a lot
Thanks a lot Dave for your great tutorials
I need to amplify an signal that ranges from 4mV up to 104mV.
Going to read the value with the 5V - 10-bit ADC on my Arduino Mini Pro.
In the lowest range (4mV) I need an accuracy of 20uV per step.
I'm able to supply the Op-amp with 6.4V single supply.
My signal is running at 200hz, and I'm going to measure the signal one time each pulse.
I try to accomplish this by using 3 Op-amp's 48x, 221x & 471x gain.
Could you help me by suggest a good value Op-amp that works in this range?
Right now I'm trying to simulate this in Multisim with NE5532P, but I seem to get the values a bit off.
Don't know if it's the bias current that makes this? A resistor at the non inverting input seems to help.
But the gain resistors in parallel seems to be to high value for this resistor.
I have also tried LM833N with much better results, seems quite steady in my simulations.
Is this Op-amp a good choice for this application?
Is there any other Op-amp that might be a better choice?
I have seen some schematics where they put a capacitor at the gain resistor? Do I need these capacitors?
Thanks a lot for any input,
Best Regards,
Anders aka Legostar