LM741

-

+ V-

V+

+Vsupply

R1 = 4.7k

Vinput

Output

R2 = 4.7k

-Vsupply

LM741

www.ti.com

SNOSC25D – MAY 1998 – REVISED OCTOBER 2015

8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

8.1 Application Information

The LM741 is a general-purpose amplifier than can be used in a variety of applications and configurations. One

common configuration is in a noninverting amplifier configuration. In this configuration, the output signal is in

phase with the input (not inverted as in the inverting amplifier configuration), the input impedance of the amplifier

is high, and the output impedance is low. The characteristics of the input and output impedance is beneficial for

applications that require isolation between the input and output. No significant loading will occur from the

previous stage before the amplifier. The gain of the system is set accordingly so the output signal is a factor

larger than the input signal.

8.2 Typical Application

Figure 1. LM741 Noninverting Amplifier Circuit

8.2.1 Design Requirements

As shown in Figure 1, the signal is applied to the noninverting input of the LM741. The gain of the system is

determined by the feedback resistor and input resistor connected to the inverting input. The gain can be

calculated by Equation 1:

Gain = 1 + (R2/R1)

(1)

The gain is set to 2 for this application. R1 and R2 are 4.7-k resistors with 5% tolerance.

8.2.2 Detailed Design Procedure

The LM741 can be operated in either single supply or dual supply. This application is configured for dual supply

with the supply rails at ±15 V. The input signal is connected to a function generator. A 1-Vpp, 10-kHz sine wave

was used as the signal input. 5% tolerance resistors were used, but if the application requires an accurate gain

response, use 1% tolerance resistors.

Copyright © 1998–2015, Texas Instruments Incorporated

Submit Documentation Feedback

9

Product Folder Links: LM741