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.
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.