Op amps? Which one is best? Answered
I have a couple op amps collected over a couple years, and I am working on a design for a linear power supply, but have stability issues, and a "down to -V" common mode input voltage for op amps is a difficult parameter to find.
* Inputs must work down to as close to the negative supply rail as possible
* needs to be stable when used in a feedback loop for a linear power supply design
* low noise / offset / blah blah good good goodies?? Hopefully?
I'm actively testing these in a basic comparator circuit to see how far I can get the inputs to the -vee (or ground) before the op amp stops working as intended.I have tested the LM324, LM386, UA1458TC, LM741, and a few of the LT one's. Only the first 2 work well on a single supply w/ the inputs near ground or Vee
LM324; // slow
LM224; // ditto, but in weird thicc package
LM386; // slow
LM741; // ancient relics of the past, not rail to rail by any means, sucks IMO.
UA1458TC // ancient relics of the past, not rail to rail by any means, sucks IMO.
LM318H; // it's in a fancy metal case :D
TL072CP; // JFET inputs, limited output current and the output can't go below the noninverting input.
TL2072AC; // ditto.
OP37; // These things aren't even that fast and can't work at unity gain.
OP27; // ditto
LT1363; CRAZY fast, 1000V/uS!!! Maybe too fast...