Electronics > Projects, Designs, and Technical Stuff
limitation of opamp in the single supply differential mode
ebastler:
--- Quote from: VanitarNordic on April 12, 2019, 09:42:02 am ---No, I never ever feel insulted by the technical talking or challenging the information. we learn from discussion. but please check you wasted how many hours to investigate someone else posts and make angry comments like that just because maybe the topic or content is repetitive or information is not enough.
Generally, engineers never support each other and they have the habit to ruin each other work, [...]
--- End quote ---
Your approach is a bit strange, if I may say so. Instead of two posts complaining about Ian's reference to your old thread, you could simply have said "Yes, it's the same design challenge" or "No, this is about a different requirement".
And how do you know that Ian "wasted how many hours" to find that old post of yours? He might simply have remembered you. I can see how that could happen... ;)
Finally, if you come here asking for help with your design, you have to be prepared for criticism. If there was nothing wrong with your design, why would you have asked for help in the first place? So I don't understand the second paragraph of your quoted post.
Ian.M:
For the record: I didn't go looking for O.P's old topic on my own, StillTrying posted the link to it, and it took me no more than 10 minutes to skim through it for an overview of O.P's problem.
Doctors mistakes kill patients one at a time. Engineers mistakes kill people by the plane, train or bridge full.
StillTrying:
--- Quote from: VanitarNordic on April 12, 2019, 08:44:46 am ---Thank you, Mr. Sherlock Holmes, for being a detector of my posts
--- End quote ---
If it wasn't for me remembering and eventually finding the old thread none of us would have much idea of what you're trying to do!
Getting a clean <mV signal AC coupled off a noisy +12V is certainly going to be V hard.
Years ago when I did similar I did it like below, the high side switch is a minor problem, but the single supply opamp is simple - no differential or AC coupling caps needed. It's so long ago I can't remember what I used for the high side switch or the opamp, probably a CA3130, or something.
--- Quote from: ebastler on April 12, 2019, 04:38:14 pm ---And how do you know that Ian "wasted how many hours" to find that old post of yours? He might simply have remembered you. I can see how that could happen... ;)
--- End quote ---
LOL. I well remembered the other thread, but was to busy with other things to find it (there's 2!) and choose a good post to link to.
VanitarNordic:
--- Quote ---So I don't understand the second paragraph of your quoted post.
--- End quote ---
if you don't have a technical point, please stay out of this. I did not ask you to teach ethical points. That was my comment just for Ian.
VanitarNordic:
I already got the technical answer and solved the problem. Thanks for all technical contributions
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