Transistor differential Amplifier 

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I would highly appreciate more of those videos. Nowadays it seems like you always pick for an IC to solve all the problems. In the past there were some really nice and sophisticated solutions for problems which nowadays seems impossible to solve without a fancy IC. So I like to see more of that "old fashioned" circuits. Keep up the good work like your videos!

Listening to you talk through that last circuit, it's like watching a chess grandmaster explain why some high level player resigned. You go from having no idea what's going on to having each veil lifted from your eyes, until the beauty of the solution shines through. Amazing, and thank you.

Waw, this is quite a nice format of video. Thanks!

Outstanding!

You the hero we need! HP gear filled up with some arcane sacred analog stuff that are often beyond comprehension. For example i tried to understand how low frequency IF filter from HP SA works but failed to even get description of this kind of topology anywhere on internet, something close to it was mostly passive and no hint active design whatsoever

great content! thanks!

Very very nice😁👍

Maybe the two 100 Ohm resistors at the input are decreasing the gain?

WHAT The HeCk? You got my attention!

Where did you got schematics for HP8505A? I can not find it on net.

never give positive feedback :D very interesting circuit

Is there a link to this document somewhere

Is there one time donation?