The operational amplifier integrator is an electronic integration circuit. Based on the operational amplifier op-ampit performs the mathematical operation of integration with respect to time; that is, its output voltage is proportional to the input voltage integrated over time. The integrator circuit is mostly used in analog computersanalog-to-digital converters and wave-shaping circuits.

Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. It only takes a minute to sign up. Connect and share knowledge within a single location that is structured and easy to search. I have a question about this circuit. How do i rearrange the formula to calculate the voltage gain of this opamp with a transistor:. But in the first circuit the resistor connected to ground is not there anymore, it is switched to the other side of R2.

It is a gain of 1 but you made the resistor zero in your formula. Not quite; once R2 has extended to the emitter of the BJT, the emitter becomes the "new" output and, this means that the voltage across RL equals Ub: -. And, because the op-amp inputs are very high impedance, you can also short out R2 doesn't affect the gain formula.

In other words, you have made a unity gain buffer amplifier that can supply a lot more load current into RL because of the transistor. Any BJT imperfections such as volt drop from base the emitter are "inside" or within the feedback loop and the op-amp tries its very best to make the voltage across RL equal to Ub.

Instead of trying to jump to some random formula for gain, think about what you know. What is the voltage at the inverting input of the op amp? What is the current through R2? What is the voltage at node A? Keep going in this manner until you get the result you need. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Start collaborating and sharing organizational knowledge. Create a free Team Why Teams?

Learn more. How to calculate the gain of a non-inverting opamp with a transistor? Ask Question. Asked 6 months ago. Modified 6 months ago. Viewed times. Like this circuit :. Capacitor charge and discharge. Capacitor impedance. Capacitive reactance. Battery capacity. Parallel resistance. Series resistance. Resistive voltage divider. Resistive voltage divider auto.

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