Electronics > Beginners

What is the purpose of this 3rd transistor ?

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james_s:
An op amp starts with a differential pair, look up the internal schematic of the 741, it's readily available and shows what's inside it.

Beamin:

--- Quote from: james_s on April 30, 2019, 01:04:47 am ---An op amp starts with a differential pair, look up the internal schematic of the 741, it's readily available and shows what's inside it.

--- End quote ---


You could build this using transistors right? Since I don't see any of those multiple gate transistor or other weird things they can do in IC's. There was a vacuum tube logic gate on mr carlsons lab I wonder if you could make this with tubes too?

Nerull:
opamps predate ICs, so you could certainly build them with tubes.

Beamin:

--- Quote from: Nerull on May 01, 2019, 07:03:43 pm ---opamps predate ICs, so you could certainly build them with tubes.



--- End quote ---

That was the thing in Mr. Carlson's videos. Imagine reading what you can do with an op amp in an advertisement? Funny to see something so basic advertised as benefits over the coopetition with their non op amp circuits. So to make the equivalent of a 16 pin DIP IC op amp you would need four of those with the power draw of eight tubes. 

james_s:

--- Quote from: Beamin on May 01, 2019, 06:36:55 pm ---You could build this using transistors right? Since I don't see any of those multiple gate transistor or other weird things they can do in IC's. There was a vacuum tube logic gate on mr carlsons lab I wonder if you could make this with tubes too?

--- End quote ---


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