#79: Op Amp Power Supply Considerations: split, single, virtual ground, etc. - a tutorial
Why Electrical Engineering Stack Exchange recommends it
Electronics Stack Exchange users link it when someone is confused about single-supply op amp operation and how to bias an input to a mid-rail virtual ground.
Recommended by 0 people across 0 different months, 2015 to 2020.
What it is
A 15-minute tutorial by w2aew on how op amps are powered: split (dual) supplies versus single supply, virtual ground biasing, and why many op amps do not care which you use. It checks input and output range specs in a datasheet and shows a classic op amp and a rail-to-rail part in the same single-supply circuit on an oscilloscope.
What people said
Cites got trolled too much this week · 2015-11 · Electrical Engineering Stack Exchange · on “Problems with op amp thermocouple circuit”
@Dov: while LM358 won't give amazing performance, it can work in this application [LINK] If I were you I'd rather focus on what went wrong before moving on to [busting] more expensive opamps. People managed it even with 741 basically: [this video]
Cites Art Seek Main · 2020-07 · Electrical Engineering Stack Exchange · on “Confused about op amps and wiring for parabolic mic”
I consider myself a fairly smart guy (20+ yrs web programmer, Computer Science degree), but in the past couple years, I've started to delve in the realm of electronics design and I'm constantly getting frustrated by lack of faster progress. (I'm YouTube/internet taught which is a lot of the problem). I'm trying to build a parabolic mic/listening device because I work in cat rescue and there's been countless times when I would be trying to listen for stranded baby kittens or a cat stuck under someone's house or in a shed or garage and having an amplifier would make things so much more effective. I have a scattered understanding on how op amps work and their function in amplifying a mic source
Cites critter · 2020-08 · Electrical Engineering Stack Exchange · on “op amp input biasing question: why wouldn't an input sensor draw current and get fried?”
First post here, thank you in advance for all responses! In a nutshell, my question is, if you bias the input of an op amp, why doesn't current then flow from your biasing mechanism into whatever input device's voltage you are measuring? I am an amateur considering using an op amp voltage follower to observe from within the vehicle the output of my vehicle's ABS sensors, which I must do without affecting their voltages. I have observed them with a scope to produce 0-2ish volt low frequency sine waves. I watched this video: [this video] where this guy uses a variable power supply to bias his input (schematic at 6:45) and also discusses using a resistor divider (schematic at 1:54). In either case I