Showing posts with label differential. Show all posts
Showing posts with label differential. Show all posts

Thursday, October 30, 2025

Some simple discrete transistor Op Amps

The problem with Op amp and other iC.-s models dev. is that you always miss to conduct a "critical test" . . . that , untill you make it and find out the next flaw . . . coz at the time you only need it to perform certain tasks at certain env. . . .

The first Amp -- it's quite old stuff . . .  is the only simulation i found and was able to set to work . . . reasonably near to what you'd expcect it should !?

 UPDATE ! -- extended supply - but it's likely a poor op amp compred to the number of transistors used for it
however -- now it !looks! quite decent up to gain 5x ??? ▼ 
 


The second Amp

 

 [EoP]