LAB_21 - Diff Amps - Lab 21 The Differential Amplifier...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Lab 21 235 The Differential Amplifier Summary In the previous lab, you used the 741 op-amp chip to design and test both a non-inverting ampli- fier and an inverting amplifier. In this lab, we will build on that experience to design and test a differential amplifier. You will then use this differential amplifier to monitor the difference between two input sig- nals. Educational Objectives After performing this experiment, students should be able to: 1. Use 4 resistors and an op-amp chip to build a differential amplifier. 2. Choose the feedback resistors to design any desired gain factor. 3. Measure the gain of the differential amplifier. Background Information Signal Processing and Analysis - In this lab you will learn some of the art of signal processing - how to coax useful information out of tiny but vital signals hidden in a flood of electrical noise. Some electrical signals are too small to be recorded without prior signal processing and amplification. For example, due to the many sources of electrical noise, the task of actually seeing the electrical activity of the heart is a non-trivial one. This general problem of extracting and analyzing a small signal in the pres- ence of significant noise is a challenge all engineers in all fields will face again and again throughout their careers. For example, a mechanical engineer may wish to study the oscillations of a very tall build- ing by monitoring the weak output of strain gauges embedded in its structural elements. A civil engineer might place fiber optic cables or piezocables in the pavement at a busy intersection to study traffic flow. A chemical engineer may need to process the weak output from any of the new family of chemical sen- sors to check for chemical leaks and monitor reaction rates. The art of coaxing information from a weak signal is a fundamental measurement skill essential to all fields of engineering. This is why you will need to know how construct a differential amplifier in order to record tiny millivolt signals. "To invent you need a good imagination and a pile of junk." - Thomas Alva Edison
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Lab 21 236 The Differential Amplifier The operational amplifier studied in the previous lab is ia a powerful tool in solving the problem of acquiring and amplifying weak signals so that they can be processed and analyzed. Either amplifier circuit (inverting or non-inverting) can be used to amplify a clean noise-free signal to a higher level.
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 10

LAB_21 - Diff Amps - Lab 21 The Differential Amplifier...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online