tiki Posted May 7, 2006 Report Share Posted May 7, 2006 i need a simple project for school. it can't cost more than $20 and i have to be able to get the parts at radio shack. it has to be very simple and quick. post any links or pics of anything that could help.thanks Quote Link to comment Share on other sites More sharing options...
slackjack Posted May 8, 2006 Report Share Posted May 8, 2006 You could use the LM741 operational amplifier to demonstate some simple function of math such as addition, integration and differentiation. The simplest one to design is probably the summing amplifier. Set all resistors equal and the output is the negative sum of the all inputs. To get rid of the negative sign use another LM741 as an invertor with a gain of 1.Summing op amp configurationInverting op ampTo achieve a gain of 1, set Rin = Rf.The output is taken from the inverting op amp. This is actually how they used to do addition and in different configurations; calculus functions. Using volatge to represent numbers.Hey you said simple ;DAlittle more challenging one (using the same LM741) is to design a "force calculator" - the force required to accelerate or decelerate an object. The LM741 must be configured as a differentiator.http://www.ibiblio.org/obp/electricCircuits/Semi/SEMI_8.html#xtocid1828610 Quote Link to comment Share on other sites More sharing options...
napster_team Posted May 12, 2006 Report Share Posted May 12, 2006 Some small projects are available in my bookMY EXPERIENCE IN AUTONOMOUS ROBOTICSIt is a free book. You can get it from yahoo group-booksbybibinhttp://groups.yahoo.com/group/booksbybibin/Bibin Johnwww.bibinjohn.tk Quote Link to comment Share on other sites More sharing options...
allvol Posted May 12, 2006 Report Share Posted May 12, 2006 Here's a project that meets all your requirements, and is showy, also.The circuit demonstrates how an operational amplifier is able to accurately follow the flucuations of an input voltage, either positive or negative. Quote Link to comment Share on other sites More sharing options...
gogo2520 Posted May 13, 2006 Report Share Posted May 13, 2006 Hello napster_team I checked out your book, nice work. Very nice. It is a good starting point for the beginner. Thanks for sharing gogo Quote Link to comment Share on other sites More sharing options...
MP Posted May 13, 2006 Report Share Posted May 13, 2006 tiki,I also wanted to point out that there is a button at the top of the page named "Projects". Click on this link and you can view the many projects posted on this site.MP Quote Link to comment Share on other sites More sharing options...
kipyegon Posted May 22, 2006 Report Share Posted May 22, 2006 Since you are requesting for a simple project, there is one I have in mind. I've already tried it myself and it was just perfect. I dont know if you are going to like it..... it's a simple lie detector. Quote Link to comment Share on other sites More sharing options...
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