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# How to build a simple amplifier using LM 741

To realize this simple project you will need just a few parts; two resistors, two 9V batteries, one famous and popular operational amplifier IC (Integrated Circuit a.k.a. chip), LM741, a breadboard and some wire to connect the parts on the breadboard.

One solution to our problem would be to get a better ADC with a greater bit resolution but that automatically means you would have to make a better PCB (Printed Circuit Board) because of the noise problems and etc. Seems like an expensive solution. However, there is a simpler and cheaper solution. We can make a voltage amplifier. It is a simpler solution, you can trust me.

To realize this simple project you will need just a few parts; two resistors, two 9V batteries, one famous and popular operational amplifier IC (Integrated Circuit a.k.a. chip), LM741, a breadboard and some wire to connect the parts on the breadboard.

LM741 is an operational amplifier. ?An operational amplifier or op-amp is a very high-gain amplifier which has two inputs, one inverting (−) and one non-inverting (+). The output voltage is the difference between the + and − inputs, multiplied by the open-loop gain.? ? Definition by Wikipedia. It is a very popular and famous IC used in a wide range of applications. It can be used for voltage, current and other amplifications. In our case it is a non-inverting voltage amplifier.

We amplify a signal by the following rule y=G*x (this is only the case for the linear amplifiers, not logarithmic or any other amplifier). y is our output signal, G is the gain and x is our input signal. For an example you have a signal that is between 2 ? 5 mV and we want to get an output signal eleven times greater than the input one, 22 ? 55 mV. So our gain should be eleven. Right, we need a formula to calculate the values of external components to get our gain.

Article by Sebastien Schmieg at http://www.e-dsp.com

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