Biomedical Engineering - Amplifier - Page 1
Forum section: electronics / beginners

author: Paradoxs
author_rank: Newbie
timestamp: December 29, 2014, 11:31:10 am
content: Hello, I have a problem.1- What is application of this circuit? What does it do?2- Simulate this circuit in a simulator software and by determine correct values for resistors, show heat losses (H) is nearly constant.3- Calculate H analytically (manually) (voltage division) and compare with part 2 in a software.Hint:(Comparator)4- By proper ratio selection for resistors, show sensitivity of heat losses (H) with respect to thermal resistance (RT) is almost zero.

author: Simon
author_rank: Unknown
timestamp: December 29, 2014, 11:36:40 am
content: I am afraid that this looks more than suspiciously like an exam paper questions. The English is not brilliant and makes it hard to understand some of the questions and this is something that you should be doing for yourself. I will assume you have textbooks to read which explain the theories that these questions are asking you to demonstrate. Is there something about them that you don't understand? It would be a lot more useful and fair if you asked for clarifications on the theories and not for answers to the questions.And before anybody starts getting "offended" I am filling out my own assignment papers right now and I'm doing it myself!

author: KJDS
author_rank: Super Contributor
timestamp: December 29, 2014, 12:08:56 pm
content: UP there ^^^^ is a sticky that is titled NEWBIES PLEASE READ BEFORE POSTING and has the following in itShort "How does this work" questions are not proper forum etiquette.School assignment questions are ok, but show what work you have done already.Regulars, please be extra nice to beginners asking questions. Do not deride them for anything, if you can't be nice, don't post.That bit about "show what you've done already" is the bit you need to add before someone will help.

author: Paradoxs
author_rank: Newbie
timestamp: December 29, 2014, 12:29:42 pm
content: Quote from: Simon on December 29, 2014, 11:36:40 amSorry my English is not good.In "Electrical Circuit 1" course, our instructor gave us these questions for additional score.he say this circuit is from Book "Medical Instrumentation Application and Design (by John G. Webster)". I searched the book but not found.Unfortunately i'm software engineering student.I summarize my questions:1- What does this circuit do?2- CalculateHusing voltage division rule.

author: Simon
author_rank: Unknown
timestamp: December 29, 2014, 12:40:18 pm
content: The first circuit you have posted with the four resistors in that layout is some sort of bridge although I forget the name of it and is quite commonly used in measuring systems. I think you need to read your text which explains how that type of circuit works as that will provide most of the answers most likely. The second question looks a lot like the combination of Ohm's law and the formula for power so is perhaps not as complicated as it looks although I don't know what all of the terms stand for again I suspect they refer to a specific text.

author: jeremy
author_rank: Super Contributor
timestamp: December 29, 2014, 01:05:39 pm
content: First is Wheatstone bridge.

author: Simon
author_rank: Unknown
timestamp: December 29, 2014, 01:08:04 pm
content: Quote from: jeremy on December 29, 2014, 01:05:39 pmThank you!

author: eas
author_rank: Frequent Contributor
timestamp: December 29, 2014, 08:43:17 pm
content: Quote from: Paradoxs on December 29, 2014, 12:29:42 pmDid you try your school's library? Sometimes there is no substitute for print.I was talking to a professor recently. She mentioned that she assigned her grad students some library work after they'd all given mealy mouthed answers about what a graph showed in a referenced cited in a paper they were discussing. After some prodding, it became clear that they'd only looked at the online version, and the online version had a black box where the figure was supposed to be.A librarian will probably be happy to help you track down the book in the stacks. Given enough time, they'd probably even get a copy from another library, if they don't have it in-house.