Basic Amplifier (OPAMP) Circuits

We found that we could connect resistors to a basic transactional amplifier to generate gains related to various inverting and non-inverting outputs and configurations.

Here is a list of "Basic Operational Amplifier Building Blocks" that we can use to create different electronic circuits and filters to make things a little easier for everyone.

Voltage Tracker

Voltage Monitor, also called buffer dose, does not raise or reverse the input signal, but instead provides isolation between the two circuits. The input impedance is very high, while the output impedance is low, avoiding any loading effect in the circuit. Since the output depends directly on one of the inputs, the total gain of the buffer is +1 and Vout = Vin.

Voltage Monitor Op-amp Circuit

Amplifier
Voltage Monitor Op-amp Circuit

Op-amp Inverter

The Inverter, also called the inverter buffer, is the opposite of the previous voltage tracker. The inverter does not upgrade if both resistances are equal, but reverses the input signal. Input impedance equals R, and the gain is -1 and returns Vout = -Vin.

Op-amp Inverter Circuit

Amplifier
Op-amp Inverter Circuit

Inverted Amplifier

The Inverted Amplifierdoes not invert the input signal or generate an invert signal. Instead, it raises it (RA + RB)/RB or 1+(RA/RB) overall. The input signal is connected to the inverted (+) input.

Inverted Op-amp Circuit

Amplifier

Inverting Amplifier

The Inverter Amplifier both reverses and amplifiers the input signal with the -RA/RB ratio. The gain of the amplifier is controlled by negative feedback using the feedback resistance RA, and the input signal is fed into the inverted (–) input.

Inverting Op-amp Circuit

Amplifier

Bridge Amplifier

Amplifier circuits that flip from above and do not flip can be connected to each other to create a bridge amplifier configuration. The input signal is common to both op-amps with the output voltage signal received along the floating load resistance RL between the two outputs.

If the sizes of the two op-amp gains, A1 and A2 are equal, the output signal will double as it is an effective combination of two separate amplifier gains.

Bridge Op-amp Circuit

Amplifier

Voltage Collector

The Collector, also called the aggregation amplifier, produces an inverted output voltage that is proportional to the sum of the V1 and V2 input voltages. More inputs can be collected. If the value of the input resistors is equal (R1 = R2 = R), the total output voltage is as given and the gain is +1. If the input resistors are not equal, the output voltage is a weighted sum and is as follows:

Vout = -(V1(RA/R1) + V2(RA/R2) + etc.)

Voltage Collector Op-amp Circuit

Amplifier

Voltage Remover

The Extractor, also called a differential amplifier, uses both inverter and non-inverter inputs to produce an output signal, the difference between two input voltages V1 and V2 that allow one signal to be removed from another. More entries can be added to be extracted if necessary.

If the resistors are equal (R = R3 and RA = R4), the output voltage is as given and the voltage gain is +1. If the input resistance is not equal, the circuit becomes a differential amplifier that produces a negative output when the V1 is higher than V2 and a positive output when the V1 is lower than V2.

Voltage Extractor Op-amp Circuit

Amplifier

Op-amp Comparator

The comparator has many usages, but the most common is to compare the input voltage with a reference voltage and change the output if the input voltage is above the reference voltage. If the input is more positive than the reference voltage set by the voltage divider Vin > Vref, the output status changes.

Input voltage, preset reference voltage and Vin < Vref'in altına düştüğünde, çıkış geri döner. Using positive feedback, the basic comparator circuit can be easily converted into a Schmitt Trigger to reduce oscillations around the switching point.

Comparator Op-amp Circuit

Amplifier

Just a few of the more common and basic operational amplifier building block configurations discussed in this section, which we can use in electronic circuits. All of the above circuits can be created using a variety of different op-amps, including the famous 741 op-amp. I hope that this short tutorial on basic op-amp building blocks will help you understand different basic op-amp circuit configurations.