Op Amps: First Stage Simplified

[@petergunn551]

i dabble in designing audio power amplifiers, which are generally giant op amps. a lot of the stuff you presented, i already know, but your presentation added a new dimension to my previous knowledge.

[@ElectronicswithProfessorFiore]

Yes! I remember seeing the schematic of the Phase Linear 400 Series 2 power amp back around 1980 or so. It was voltage gain stage followed by a hefty class B stage, all wrapped inside the feedback loop of an op amp (an LF356 if I remember correctly).

[@JaenEngineering]

Almost all DIY discreet power circuits I've seen are just op-amps with high current outputs. Even the "Leech" amp, for all it's complexity, is just an op amp. Now analysing that would make for an entire video series.

[@petergunn551]

@@JaenEngineering look up the schematic for the APT-1 amp. i worked at APT for several years testing and repairing those amps.

[@andymouse]

Such an easily digested lecture, thanks !

[@simonyoungglostog]

Excellent, I recognised every part of this circuit; great teaching methinks!

[@amjadtrablsi4051]

The best Video i watched about this thema , really great work sure. Thank you so much for making it.

[@rudygomez6996]

i am actually starting to understand 🙌 thank you!

[@BlablablaPapapa]

Great presentation

[@bob_mosavo]

Thanks, Prof. Fiore 👍

[@wegi9621]

Epic explanation and examples.

[@horacepoon7044]

Explanation is very clear!

[@asianraw]

Great lesson. Thanks a lot Professor Fiore.

[@SeanPorio]

@7:32 Bonk

[@ivolol]

Why is this setup missing the 5k resistor that was on the left side of the current sink in the previous video?

[@ElectronicswithProfessorFiore]

That 5k was a carry through from the first iteration of that circuit that used resistors in the collector. I think it's better to change just one thing at a time to illustrate a point.

[@poojapadalia518]

@ElectronicswithProfessorFiore. ..Sir I always get confused when I see base node connected directly with emitter without a yresistor..does any feedback current flows ..why it can flow ..it seems like we are shorting it base and collector node hope my question makes a sense here..please explain....if possible ..thanks

[@ElectronicswithProfessorFiore]

Do you mean base to collector? There are no direct connections of base to emitter here. Connecting the base directly to the collector shorts out the base collector junction leaving you with the base emitter "diode".

[@poojapadalia518]

@ElectronicswithProfessorFiore yes I mean base collector ..thank you Prof Fiore ..got the point .

[@VMgeschwader4117]

👍