Ronald Meij Maker · 1 d ago
Thirteen, in two halves. The first seven are the electronics proper: the two golden rules, the standard configurations derived from them, MIT on why the ideal model works at all, and then the ways a real device refuses to be ideal. Gain bandwidth, slew rate, and noise, which is the one most people quote and fewest people can actually read off a datasheet. The last six are ours. Discrete audio op-amps: the API 2520, the Jensen 990 and John Hardy who still builds it, and op-amp rolling. If you have ever wondered what is actually inside the modules in the preamp list, it is this. One gap worth naming. There is no good video on the JE-990 topology itself. That material lives in schematics, in Deane Jensen's papers and in forum threads, not on video. If you find one, post it. 01 Introduction to opamps: The Golden Rules Andrew MacRae The two rules you analyse every feedback circuit with: no input current, and the inputs get driven to the same voltage. www.youtube.com/watch?v=jHLQjusZP1Y 02 Electronics 6: OpAmps, Golden Rules, Non-Inverting Amplifier, Inverting Amplifier, Follower, I to V HarveyMuddPhysicsElectronicsLab A lab lecture deriving inverting, non-inverting, follower and transimpedance from those rules. The whole toolkit in one sitting. www.youtube.com/watch?v=yzawwAYDCQU 03 Lec 19 | MIT 6.002 Circuits and Electronics, Spring 2007 MIT OpenCourseWare MIT on the operational amplifier abstraction: how the ideal model is built and why negative feedback makes it usable. Confirmed as Lecture 19 against the OCW page itself. www.youtube.com/watch?v=V0z_f7qxLcY 04 #172: Basics of Op Amp Gain Bandwidth Product and Slew Rate Limit w2aew Both limits on a scope, so you can see the output fail rather than read that it would. www.youtube.com/watch?v=UooUGC7tNRg 05 The Ultimate Op-Amp Comparison - Bandwidth, Slew Rate, Frequency Response, CMRR & More! Sine Lab Several real devices measured against each other on the parameters where a real op-amp stops being the ideal one. www.youtube.com/watch?v=BKA5ESd0IJs 06 EEVblog #528 - Opamp Input Noise Voltage Tutorial EEVblog How input referred voltage noise is specified on a datasheet, what nV per root hertz means, and how to actually use the number. www.youtube.com/watch?v=Y0jkPLuFdnM 07 176N. Intro. to amplifier noise, output noise, and input-referred noise Ali Hajimiri (Academy) The graduate version of the same: output noise against input referred noise, from a Caltech course. www.youtube.com/watch?v=XgwYOPLAuSY 08 Op amps vs discretes Paul McGowan, PS Audio A short answer to why a monolithic chip and a discrete gain stage behave differently. A manufacturer talking, so take it as opinion. www.youtube.com/watch?v=L7CBoqX8SSI 09 What the hell is an Op-amp? API style (CAPI) GAR 2520 Build The DIY Recording Studio What a discrete audio op-amp is, explained while building a 2520 clone. The part that sits inside half the gear in the preamp list. www.youtube.com/watch?v=GY-NPUNKb0o 10 Professor Dan's 2520 Opamp Shootout. ProfessorDan Several different 2520 format op-amps compared in the same circuit. www.youtube.com/watch?v=6CRJTuJ2y18 11 REPLACING CHIPS WITH DISCRETE OP-AMPS (IN THE JAPANEVE) JLM Audio 2520/990 Adaptor Heights Lab Official Swapping chips for 2520 and 990 format discretes on an adaptor board. Op-amp rolling with a soldering iron. www.youtube.com/watch?v=e_s2DbZMbIQ 12 How did you start building the 990 Op-amp - Computer.m4v John Hardy The man who manufactures the 990 on how he came to build Deane Jensen's design. Informal, and a primary source. www.youtube.com/watch?v=DPq89ne4OS8 13 10 OpAmps tested with HQ sound demo - Op-Amp Rolling - Find the hidden gem ! VirtualHiFi Ten op-amps through the same socket with recorded samples. A listening test, not a measurement, and worth treating as one. www.youtube.com/watch?v=kNDX7SCN6Jc Every link in this channel was checked against YouTube itself: the title and the channel name under each one are what YouTube returns for that video, not what anybody remembered. That check earned its keep more than once, because a search result is quite happy to hand you a title that belongs to a different video. What could not be done is watch them all. So the line under each link comes from the verified title and channel, not from having sat through it. If one turns out not to be what it says, reply and it comes off the list. Same if a link dies, which they do.