4 Pin Diagram of IC741 Op-amp Pin Description This is a general-purpose operational amplifier. Pin diagram of IC-741 is shown in the figure 4. Ideally, the pin description can be divided into 4 broad categories: Three main stages of a general-purpose op-amp are a differential input stage, a push-pull output stage and an intermediate gain stage. It is built of various resistors, capacitors and transistor stages. Where, A OL is the open-loop gain of the amplifier. The output voltage is proportional to the difference of the input voltages and is given by 3 Effect of signal at non-inverting input on the output Non-Inverting Input: A positive voltage applied to this input terminal will lead to a positive swing at the output. 2 Effect of signal at inverting input on the output
Inverting Input: A positive voltage applied to this input terminal will lead to a negative swing at the output. They have their names according to the functions performed by them.
The positive terminal of the input is called the “ non-inverting” input and the negative terminal is called the “ inverting” input. The schematic representation of the op-amp is shown below. Today, operational amplifiers have become a popular building block in electronic circuits.Īs said earlier, the operational amplifier has two inputs and a single output. The reason behind it being called as “operational” is that, in early days when digital computers were not evolved, at that time, the basic “mathematical operations” like addition, subtraction, differentiation and integration were performed by them. As the name suggests, it is basically an amplifier, whose job is to amplify the input signals.
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