The 20kΩ is variable resistor wired as a voltage divider also known as a potentiometer or pot for short.
You manually adjust the pot until you get the desired voltage,
If I use voltage divider.There is nothing to compute. You adjust the pot until you get 10.5V.
Google voltage divider.
No. RE is not part of the voltage divider.If I use voltage divider.
Vref = (Vcc × 20k)/(20k+10)
= 11.99v if vcc is 12. Is it right?
It's hard to see how this thought is reasonable given that the inverting input of the opamp is tied to a node whose voltage depends on the output.OK understood. I thought op amp is acting as comparator without any reference to the output.
If that's the case, then what would the current be?And if v+ is greater than v- then Vout=Vcc. If v- is greater then Vout=Vee. Then the current ic is adjusted by resistor (10ohm).
Why do you think you can assume it is 10V instead of the 10.5V that it is stated as being adjusted to?So by the way you all explained can I assume Vref as 10v instead 10.5v. And adjust potentiometer to get 10v.
You can't just pick the first to resistances you see and throw them into an equation and expect the result to have any meaning whatsoever.If I use voltage divider.
Vref = (Vcc × 20k)/(20k+10)
= 11.99v if vcc is 12. Is it right?
That's fine -- making mistakes is how we learn best and having our mistakes pointed out to us is how we learn best the fastest.I was mistaken. I thought they are in seeies . iam in very learning stage.
by Jake Hertz
by Don Wilcher
by Jake Hertz