memphis242
- Joined Oct 8, 2019
- 1
Thank you for this post! I had literally come across the exact same point in the textbook just an hour ago and have been racking my brain hard on this until I came across this post.
I guess this thread is a little older but i could not help comment on a few things.Hello,
I am new to electronics, trying to self-study, I amworking through the Arts of Electronics textbook. On page 67 it says:
"In an emitter follower the npn resistor can only "source" current".
What does "to source current" mean?
Here is the circuit the textbook refers to:
Also, it says that this circuit cannot go more negative than -5V output (-4.4V input), and that further negative swing at the input results in reverse biasing the base-emitter junction. How come? Why? It seems to me that there is no problem with a, say -6V input. There is still plenty of leeway to keep the base-emitter junction forward-biased...
Thank you.
That book is excellent- put a bookmark in it and shelf it. Get this one and read it. It will take you farther faster, and will help you with BJTs much faster:Hello,
I am new to electronics, trying to self-study, I amworking through the Arts of Electronics textbook. On page 67 it says:
"In an emitter follower the npn resistor can only "source" current".
What does "to source current" mean?
Here is the circuit the textbook refers to:
Also, it says that this circuit cannot go more negative than -5V output (-4.4V input), and that further negative swing at the input results in reverse biasing the base-emitter junction. How come? Why? It seems to me that there is no problem with a, say -6V input. There is still plenty of leeway to keep the base-emitter junction forward-biased...
Thank you.
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