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24.15.32.233
In Reply to: RE: Opamp issues posted by grhughes on May 19, 2012 at 07:19:43
"To be integrated on the same chip the output topology has to be Class AB or B and never Class A "
Maybe - but with the addition of a simple pull down resistor you can force the output section of many devices into class A. And the chips survive just fine as long as they are operated in specs and properly heat sinked.
Follow Ups:
Along the lines of what Jim said, check Sheldon Stokes headphone amp out. I have one and like the man says, it doesn't sound like "sand". Sheldon forced good quality opamps to sink a bit of current. It works! :> D
Eli D.
Jim is eminently correct. The BB OPA604/2604 is a perfect example, can be used in many well respected tuners, and has no issues running in Class A with an appropriate heat sink. I've got a couple of tuners that have been running 5+ years with no hint of problems.
HA
Yes, class A- done that, been there. Better, but no thanks.
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