Non investing op amp variable gain amplifier

Voltage control using transistor waveforms The output signal varies between two values, determined by the two gain settings, based on the state of the controlled transistor. Figure 4. Variable Gain Inverting Amplifier using potetiometer On the inverting amplifier a potentiometer is used to control manually the output voltage, replacing the standard feedback resistor.

Figure 5. Variable Gain Inverting Amplifier using potetiometer - breadboard circuit Procedure Use the first waveform generator as source Vin to provide a 2V amplitude peak-to-peak, 1 kHz sine wave excitation to the circuit. By varying the value of the potentiometer, an animated plot is presented in Figure 6. Figure 6. Variable Gain Inverting Amplifier using potetiometer - waveforms Using this type of configuration, the output is inverted and amplified based on the feedback resistance value.

Figure 7. Figure 8. By varying the value of the potentiometer, an animated plot is presented in Figure 9. Figure 9. Questions 1. Depending on the input type, op-amp can be classified as Inverting or Non-inverting. In this tutorial, we will learn how to use op-amp in noninverting configuration.

In the non-inverting configuration, the input signal is applied across the non-inverting input terminal Positive terminal of the op-amp. As we discussed before, Op-amp needs feedback to amplify the input signal. This is generally achieved by applying a small part of the output voltage back to the inverting pin In case of non-inverting configuration or in the non-inverting pin In case of inverting pin , using a voltage divider network. Non-inverting Operational Amplifier Configuration In the upper image, an op-amp with Non-inverting configuration is shown.

The signal which is needed to be amplified using the op-amp is feed into the positive or Non-inverting pin of the op-amp circuit, whereas a Voltage divider using two resistors R1 and R2 provide the small part of the output to the inverting pin of the op-amp circuit. These two resistors are providing required feedback to the op-amp. In an ideal condition, the input pin of the op-amp will provide high input impedance and the output pin will be in low output impedance.

The amplification is dependent on those two feedback resistors R1 and R2 connected as the voltage divider configuration. Due to this, and as the Vout is dependent on the feedback network, we can calculate the closed loop voltage gain as below. Also, the gain will be positive and it cannot be in negative form.

The gain is directly dependent on the ratio of Rf and R1. Now, Interesting thing is, if we put the value of feedback resistor or Rf as 0, the gain will be 1 or unity. And if the R1 becomes 0, then the gain will be infinity. But it is only possible theoretically. In reality, it is widely dependent on the op-amp behavior and open-loop gain.

Op-amp can also be used two add voltage input voltage as summing amplifier. Practical Example of Non-inverting Amplifier We will design a non-inverting op-amp circuit which will produce 3x voltage gain at the output comparing the input voltage.

We will make a 2V input in the op-amp. We will configure the op-amp in noninverting configuration with 3x gain capabilities. We selected the R1 resistor value as 1. R2 is the feedback resistor and the amplified output will be 3 times than the input.

Voltage Follower or Unity Gain Amplifier As discussed before, if we make Rf or R2 as 0, that means there is no resistance in R2, and Resistor R1 is equal to infinity then the gain of the amplifier will be 1 or it will achieve the unity gain. As there is no resistance in R2, the output is shorted with the negative or inverted input of the op-amp. As the gain is 1 or unity, this configuration is called as unity gain amplifier configuration or voltage follower or buffer.

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Voltage control using transistor The configuration of the circuit is similar to a basic non-inverting amplifier. The only addition consists of a transistor and a resistor in parallel with resistor R2. Hardware Setup Build the following breadboard circuit for the voltage-controlled amplifier using transistors. Figure 2. Voltage control using transistor breadboard circuit Procedure Use the first waveform generator as source Vin to provide a 2V amplitude peak-to-peak, 1 kHz sine wave excitation to the circuit.

Use the second waveform generator for controlling the transistor, providing a 2V amplitude, 1Hz square wave excitation. Configure the scope so that the input signal is displayed on channel 1 and the output signal is displayed on channel 2. An animated plot is presented in Figure 3.

Voltage control using transistor waveforms The output signal varies between two values, determined by the two gain settings, based on the state of the controlled transistor. Figure 4. Variable Gain Inverting Amplifier using potetiometer On the inverting amplifier a potentiometer is used to control manually the output voltage, replacing the standard feedback resistor. Figure 5. Variable Gain Inverting Amplifier using potetiometer - breadboard circuit Procedure Use the first waveform generator as source Vin to provide a 2V amplitude peak-to-peak, 1 kHz sine wave excitation to the circuit.

Those two differential input pins are inverting pin or Negative and Non-inverting pin or Positive. An op-amp amplifies the difference in voltage between this two input pins and provides the amplified output across its Vout or output pin. Depending on the input type, op-amp can be classified as Inverting or Non-inverting.

In this tutorial, we will learn how to use op-amp in noninverting configuration. In the non-inverting configuration, the input signal is applied across the non-inverting input terminal Positive terminal of the op-amp. As we discussed before, Op-amp needs feedback to amplify the input signal.

This is generally achieved by applying a small part of the output voltage back to the inverting pin In case of non-inverting configuration or in the non-inverting pin In case of inverting pin , using a voltage divider network. Non-inverting Operational Amplifier Configuration In the upper image, an op-amp with Non-inverting configuration is shown.

The signal which is needed to be amplified using the op-amp is feed into the positive or Non-inverting pin of the op-amp circuit, whereas a Voltage divider using two resistors R1 and R2 provide the small part of the output to the inverting pin of the op-amp circuit. These two resistors are providing required feedback to the op-amp.

In an ideal condition, the input pin of the op-amp will provide high input impedance and the output pin will be in low output impedance. The amplification is dependent on those two feedback resistors R1 and R2 connected as the voltage divider configuration. Due to this, and as the Vout is dependent on the feedback network, we can calculate the closed loop voltage gain as below. Also, the gain will be positive and it cannot be in negative form.

The gain is directly dependent on the ratio of Rf and R1. Now, Interesting thing is, if we put the value of feedback resistor or Rf as 0, the gain will be 1 or unity. And if the R1 becomes 0, then the gain will be infinity. But it is only possible theoretically. In reality, it is widely dependent on the op-amp behavior and open-loop gain.

Op-amp can also be used two add voltage input voltage as summing amplifier. Practical Example of Non-inverting Amplifier We will design a non-inverting op-amp circuit which will produce 3x voltage gain at the output comparing the input voltage. We will make a 2V input in the op-amp. We will configure the op-amp in noninverting configuration with 3x gain capabilities. We selected the R1 resistor value as 1.

R2 is the feedback resistor and the amplified output will be 3 times than the input. Voltage Follower or Unity Gain Amplifier As discussed before, if we make Rf or R2 as 0, that means there is no resistance in R2, and Resistor R1 is equal to infinity then the gain of the amplifier will be 1 or it will achieve the unity gain.