The substrate is N type phosphorus doped silicon, the base is boron doped P type silicon by diffusion. The whole die is diffused, Next the die is coated with the base contact patern usually out of tin gold alloy and a passivation SiO2 layer is applied to the margin The final layer is N type phosphorus doped silicon applied by diffusion or direct ion implantation. Finally the contact is created by metal deposition. This contact is usually aluminum.
Old germanium transistors like OC72 had a glass enclosure painted black, except on top what made them phototransistors too. Sometimes the paint peeled off and you could see: the were very like the classical drawing we do on class or, more like a o|O (yes this form I drew on ASCII) with the | far larger base, the base was a thin sheet and the emitter and collector like solder blobs, the emitter smaller blob than the collector.
Great video! Shame the most important moments of pointing on the board are eclipsed by the professor's head. It nevertheless was an explanation I really never knew I needed, it connects real world to the theory in a way that no other material does in my experience!
Yes that was my bad - This was my first attempt to have a colleague help with a video, and I should have gave better coaching on camera angles - really sorry about that! But I'm glad you found the video helpful nonetheless!
@@DrShaneMTU No. You should know that the Professor instinctively would position himself to let you see what he's showing since you've set it up for him to be talking to you. Therefore the logical fix is to have the camera film from the angle you're at.
Thanks for the insight, we are what 70 years into the transistor age and much of it has been distant and Public General knowledge in hardware is low.lol
Fascinating. Absolutely amazing insight into something I have used thousands of times.
Good explanation on a topic not usually covered.
I've seen decapped cups before, but never a single transistor. Never thought I'd see an actual 2N2222 completely naked like that. Very neat.
I don't know much about this stuff but I've always found this stuff intriguing. So I'm subbing and I watched the entire video 👍
Thanks!
The substrate is N type phosphorus doped silicon, the base is boron doped P type silicon by diffusion. The whole die is diffused, Next the die is coated with the base contact patern usually out of tin gold alloy and a passivation SiO2 layer is applied to the margin The final layer is N type phosphorus doped silicon applied by diffusion or direct ion implantation. Finally the contact is created by metal deposition. This contact is usually aluminum.
Old germanium transistors like OC72 had a glass enclosure painted black, except on top what made them phototransistors too. Sometimes the paint peeled off and you could see: the were very like the classical drawing we do on class or, more like a o|O (yes this form I drew on ASCII) with the | far larger base, the base was a thin sheet and the emitter and collector like solder blobs, the emitter smaller blob than the collector.
4:50 for the answer re: the weird shape of the top layer.
Great video! Shame the most important moments of pointing on the board are eclipsed by the professor's head.
It nevertheless was an explanation I really never knew I needed, it connects real world to the theory in a way that no other material does in my experience!
Yes that was my bad - This was my first attempt to have a colleague help with a video, and I should have gave better coaching on camera angles - really sorry about that! But I'm glad you found the video helpful nonetheless!
@@DrShaneMTU
No. You should know that the Professor instinctively would position himself to let you see what he's showing since you've set it up for him to be talking to you.
Therefore the logical fix is to have the camera film from the angle you're at.
I learned something new today, thank you! Had no idea that was the perspective of that common NPN/PNP drawing. How did you open this up?
Glad to hear you learned something from the video! I just held the transistor to a belt sander until the top of the tin can was removed.
@@DrShaneMTU TO3 and TO5 are probably better for this than the TO18.
Vceo for the 2N2222 is 40V.
Thanks for the insight, we are what 70 years into the transistor age and much of it has been distant and
Public General knowledge in hardware is low.lol
It sure would be nice if he'd get his head out of the way of the camera.
The more technical the material, the less technical the presentation. P/T=?
@@elderbob100 it's true :D
Redo!! Lol jk
You're gonna have to get rid of all those Umm/so/err/like/kinda in your speech if you want to be more marketable/shareable.
(pots know black.. 😜 )