Op amp circuit example collection? - Page 1
Forum section: electronics / beginners

author: G-son
author_rank: Regular Contributor
timestamp: September 25, 2022, 06:38:18 pm
content: Got some op amps coming and intend to putting some circuits together on the breadboard to give myself a refresher course in electronics - it's been over 20 years since school. So no intended actual use for the circuits right now, other than waking up some long lost memories and having some fun seeing the circuits do what they're supposed to do (or trying to figure out why they don't).I have no problem finding the most basic example circuits; voltage followers, inverting and non-inverting amplifiers and so on, even integrators and derivators, but once we get beyond those I'm not finding very many good and interesting examples that could be fun to give a try. Anybody know a good source for a collection of examples?(I tried searching the forum, but couldn't limit the search to just the right kind of topics, just got an information overload.)

author: Kleinstein
author_rank: Super Contributor
timestamp: September 25, 2022, 06:45:38 pm
content: National Semiconductor (now Ti snla140) has a rather long Appl. note Nr 31 (Op Amp Circuit Collection) that gives a long lost of OP-amp circuits.

author: pqass
author_rank: Super Contributor
timestamp: September 25, 2022, 06:58:45 pm
content: TI App Report SBOA092A Oct 2001 "HANDBOOK OF OPERATIONAL AMPLIFIERAPPLICATIONS":http://www.talkingelectronics.com/PDF/opamphandbook.pdfCheatsheet:https://www.reddit.com/r/cheatsheets/comments/35a6dm/op_amp_cheat_sheet_xpost_rengineeringstudents/Also Google for "op amp cookbook pdf".Especially "Radio Shack - Engineer's Mini-Notebook - Op Amp IC Circuits"You can make a simple yet very useful constant current load:http://www.kerrywong.com/2013/03/08/constant-current-dummy-load-in-an-hdd-cooler/PWM genarator:https://electronics.stackexchange.com/questions/239781/weird-op-amp-voltage-increase-when-using-ac-dc-power-supplyFunction generator:http://www.learningaboutelectronics.com/Articles/Function-generator-circuit.php

author: G-son
author_rank: Regular Contributor
timestamp: September 25, 2022, 08:14:42 pm
content: Lots of good reading there. Excellent! Diving right into it!

author: Infraviolet
author_rank: Super Contributor
timestamp: September 25, 2022, 08:20:48 pm
content: Really good links those, especially "talking electronics" and the AN-31 note, thanks. Really useful for generating ideas about how do build up further circuits.

author: kripton2035
author_rank: Super Contributor
timestamp: September 25, 2022, 08:26:47 pm
content: https://web.mit.edu/6.101/www/reference/op_amps_everyone.pdf

author: EPAIII
author_rank: Super Contributor
timestamp: September 25, 2022, 09:08:07 pm
content: I have built many Op Amp based devices over the years. Audio mixers, preamps, distribution amplifiers, control circuits, filters, etc. I often started with a refresher dive into the "IC op-amp Cookbook" by Walter G. Jung which I have read cover-to-cover at least twice. It may have been published a long time ago, but the circuits in it still work, even with more modern ICs.https://www.thriftbooks.com/w/ic-op-amp-cookbook-by-walter-g-jung-1974-05-03/19020865/item/27539684/?mkwid=%7cdc&pcrid=77447014569095&pkw=&pmt=be&slid=&product=27539684&plc=&pgrid=1239149857881917&ptaid=pla-4581046490479305&utm_source=bing&utm_medium=cpc&utm_campaign=Shopping+%7c+Everything+Else&utm_term=&utm_content=%7cdc%7cpcrid%7c77447014569095%7cpkw%7c%7cpmt%7cbe%7cproduct%7c27539684%7cslid%7c%7cpgrid%7c1239149857881917%7cptaid%7cpla-4581046490479305%7c&msclkid=f65a4197922514fd6d0522a72f0f4a3f#idiq=27539684&edition=20287496You don't say which op amp you have ordered, but there surely is at least a spec sheet on it, if not some application notes. Do a search for those on the Digi-Key, Mouser, or the manufacturer's site.For a deeper understanding of the theory a good book is "Handbook of Integrated-Circuit Operational Amplifiers" by George B. Rutkowski. But Jung's book has more real life circuits in it.As for interesting circuits, the one I remember most was a circuit that took the signal strength voltage from a microwave receiver (video/audio link for news feeds) and developed an audible signal that allowed the listener to track a moving transmitter. It created a tone where the frequency and the duration of the tone both changed with the signal strength. This made it easier for the listener to know when he was closer to the correct direction when the transmitter was on a helicopter, flying around. A short, low frequency tone meant you were about to lose it and a longer, high frequency tone meant you were right on.There is almost no end to the applications of op amps in the analog world.

author: rstofer
author_rank: Super Contributor
timestamp: September 25, 2022, 09:14:17 pm
content: I have a lot of fun with analog computing. If you are interested in 2d order ordinary differential equations (Mass Spring Damper or LC circuit), you can build up an analog computer like Dr. Vogelshttp://www.analogmuseum.org/english/homebrew/vogel/A picture of my unmounted version is attached. It's hard to believe it's been 8 years since I took that photo...

author: RoGeorge
author_rank: Super Contributor
timestamp: September 25, 2022, 09:43:24 pm
content: Search for "Design with Operational Amplifiers and Analog Integrated Circuits" by Sergio Franco.

author: Vovk_Z
author_rank: Super Contributor
timestamp: September 25, 2022, 09:57:58 pm
content: Art of Electronix by Horowitz and Hill

author: David Hess
author_rank: Super Contributor
timestamp: September 25, 2022, 10:52:51 pm
content: For more advanced stuff, look at more general application notes. National Semiconductor and Linear Technology released a lot of them.

author: G-son
author_rank: Regular Contributor
timestamp: September 25, 2022, 11:19:06 pm
content: Quote from: EPAIII on September 25, 2022, 09:08:07 pmMost are LM358, and a few NE5532. Should get me started, I think. There's indeed some good info in the spec sheets (and spec sheets for other op amps).The vast possibilities for op amps is why I want to brush up on using them. I've come across some problems from time to time that could have been solved using op amps and other basic electronics, but the step from realizing it can be done to figuring out how to actually do it has been a bit too large at the time. Maybe next time, if I've already tried out a suitable circuit on the breadboard then so I've got a feel for it already...Thanks to all of you for all the great suggestions! I have a lot of reading to do now!

author: langwadt
author_rank: Super Contributor
timestamp: September 25, 2022, 11:26:31 pm
content: there's also the blue book from national,https://www.researchgate.net/profile/Cyril-Mechkov/post/Opamp-with-both-positive-and-negative-feedback/attachment/5d53d5accfe4a7968dc04c51/AS%3A791733034053632%401565775273484/download/NationalSemiconductorLinearApplicationsHandbook1994_text.pdf

author: Old Printer
author_rank: Frequent Contributor
timestamp: September 26, 2022, 12:42:51 pm
content: Depending on where you ordered you components from, be aware of many reports of counterfeit parts. If you start getting unexpected results from your circuits, unless you bought from one of the major parts houses like DigiKey, Farnell's etc, at least consider this a possibility before you trash your circuit. My first thought is who would bother faking a LM358, but there have been reports of it happening, or at least people have claimed they got fake jellybean IC's.

author: ledtester
author_rank: Super Contributor
timestamp: September 26, 2022, 01:59:48 pm
content: Quote from: langwadt on September 25, 2022, 11:26:31 pmThanks for this link -- it's nice to have a compilation of all of the National app notes in one place.After some sleuthing I found a trove of old National publications on the Internet Archive:https://archive.org/details/bitsavers_nationalDoing a metadata query, for instance, on "linear applications" will yield a couple of different editions of that publication.

author: Terry Bites
author_rank: Super Contributor
timestamp: September 27, 2022, 05:33:23 pm
content: A treasure trove.www.analog.com/en/education/education-library/op-amp-applications-handbook.html

author: RoGeorge
author_rank: Super Contributor
timestamp: September 29, 2022, 05:47:25 pm
content: All about opamps configurations in 4 pages:http://www.philbrickarchive.org/1964-1_v12_no1_the_lightning_empiricist.htm

author: RoGeorge
author_rank: Super Contributor
timestamp: September 29, 2022, 06:17:58 pm
content: 41 Projects using 741 OP Amp - by M.C. Sharma, M. Sc. - 1982https://pdfcookie.com/documents/41-projects-using-ic-741-op-amp-z3ld8d7y8gv4Quotehttps://www.analog.com/en/education/education-library/amplifier-applications-guide.htmlQuotehttps://www.analog.com/en/education/education-library/op-amp-applications-handbook.html

author: Terry Bites
author_rank: Super Contributor
timestamp: September 30, 2022, 08:58:41 am
content: How about building an analog computer. Hours of fun. Build it one function at a time. An analog synth is an analog computer- go Kraftwerk.Loads of cool things to try eg. chaos.the-analog-thing.org/docs/dirhtml/rst/applications/roessler_attractor/aplaca_1/eg archive.org/details/anacomp/100001/mode/1upYou can still get most of the parts albeit more modern ones. You can mix in digital IO. Analog is the future.Here's some analog computer sex on stilts.https://en.wikipedia.org/wiki/Analog_computer#/media/File:AKAT-1.JPGhttps://www.analog.com/en/education/education-library/nonlinear-circuits-handbook.html

author: RoGeorge
author_rank: Super Contributor
timestamp: September 30, 2022, 11:16:25 am
content: Quote from: Terry Bites on September 30, 2022, 08:58:41 am"Applications Manual for Computing Amplifiers for Modeling, Measuring, Manipulating, and Much Else" George A. Philbrick Researches, 1966Webpage ToC:https://www.analog.com/en/education/education-library/applications-manual-computing-amplifiers.htmlFull book PDF:https://www.analog.com/media/en/training-seminars/design-handbooks/Application-Manual-for-computing-amplifiers/application-manual-computing_amplifiers.pdf

author: G-son
author_rank: Regular Contributor
timestamp: September 30, 2022, 11:45:30 pm
content: I might be spending all my time reading these gold mines rather than making circuits. But that's probably a good thing anyway.

author: RoGeorge
author_rank: Super Contributor
timestamp: October 02, 2022, 09:19:21 am
content: Start by plugging an opamp into the breadboard first.Or else one could read for a lifetime about opamps and never build anything.More opamp books, by Jerald G Graeme from former Burr-Brown, search for:"Designing With Operational Amplifiers - Application Alternatives""Applications of Operational Amplifiers - Third Generation Techniques"

author: G-son
author_rank: Regular Contributor
timestamp: October 02, 2022, 11:25:56 am
content: Quote from: RoGeorge on October 02, 2022, 09:19:21 amWay ahead of you.Got a LM358 (starting cheap) along with a linear hall effect sensor on there now, in an attempt to DIY a current clamp. Currently running ½358 as 100x gain inverting amplifier and ½358 as a voltage follower to adjust a reference voltage to the same level as the sensor gives as zero point (2.5V).So far promising results, good enough for connecting to a volt meter, but a bit too noisy for the oscilloscope - I'll probably try a low noise op amp for that later.

author: RoGeorge
author_rank: Super Contributor
timestamp: October 02, 2022, 12:12:11 pm
content: Quote from: G-son on October 02, 2022, 11:25:56 amCongrats!