Operational Amplifiers No 3, Voltage Followers

[@bjj6708]

Been a radio ham 45 years, but still like going back to basics & you explain this stuff better than any one else out there, stuff I can use to design practical stuff, eg, a voltage comparator relay to switch in my auxiliary battery when engine running on my truck, thanks Bob.

[@37latitude]

7:20 How does 20ma get out of op amp, when it cant come thru the inputs.

[@richardpope9985]

I think it comes from the 'power supply' input. Notice at 7:13 Bob said he left out the drawing of the 'power supply' inputs. So, the 'power input' is providing the 20ma, not the Inverting or non-inverting inputs.

[@37latitude]

​@@richardpope9985thanks

[@stryker126]

Came here to try to demistify some stuff I see in guitar circuits. Very enlightening

[@rudrakshavegad1999]

Hello sir, i have a question and that confuses me a lot, as we know the op amp does what ever it takes to make both the inputs equal. But then it seems weird because output of an op amp is gain×( V+ - V-) and since the op amp made the inputs equal it should give zero volts output since now both inputs are at same voltage if we observe this in other configurations of op amp as well the voltage follower.

[@worroSfOretsevraH]

Would this work as a voltage follower if we swap the inputs? (- input, + feedback)

[@jnc5255]

Thanks sir...

[@omiza3416]

In practical is working exactly like that? (Voltages at the oitput pin of an opamp) . I mean is giving regulated voltages less than the power supply (+10v in video)? Thanks for the lessons