Are op amp circuits only capable of puting out an on/off output or are they capable of a variable output ie if controlled by a variable resistor.
They can have variable output.Are op amp circuits only capable of puting out an on/off output or are they capable of a variable output ie if controlled by a variable resistor.
Do you have a pic of a what you mean? I have a basic understanding of op amps. I spoke to someone who mentioned that they can only be turned on or off. I will be using it in an comparative circuit.
I really suggest you find out more about these things before you rush into an application.Understand that but I was of the understanding that the actually output was constant (able to be varied, but still constant). I also understand that they can be used to invert the voltage ie + to -. Just want to know how to use it to create a the above mentioned varying output.
You may find my video on the basics of op amp operation helpful:Are op amp circuits only capable of puting out an on/off output or are they capable of a variable output ie if controlled by a variable resistor.
Unless you told that person that you were pretty sure that they were wrong, these two statements are a bit contradictory.I have a basic understanding of op amps. I spoke to someone who mentioned that they can only be turned on or off.
I think, the part of the question regarding the "variable resistor" was not yet answered up to now.Are op amp circuits only capable of puting out an on/off output or are they capable of a variable output ie if controlled by a variable resistor.
While I agree with the good point you are making, I read the original question as implying that the opamp has to be on/off unless something like this is done. Now. what was meant by "controlled by an variable resistor" is unclear. Does putting a pot from output to ground and using the wiper voltage at the output qualify?I think, the part of the question regarding the "variable resistor" was not yet answered up to now.
Of course, you can have a variable output (at a constant input signal) using a variable resistance within the feedback chain. For example, this can be achieved using a FET in its linear region (used as a voltage controlled resistor) or other parts like thermistors or LDR`s.
Remember, the first WIEN oscillator circuit used a filament bulb for realizing an amplitude controlled gain.
by Jake Hertz
by Jake Hertz
by Jake Hertz