Hi fellas
A couple weeks ago I saw this question. today I remember that I had a question about this question:
http://electronics.stackexchange.co...tor-for-3-volt-base-to-switch-control-5-volts
The reason that Andy pointed out is:
"The reason why a single NPN emitter follower doesn't work is because the emitter output HAS to be lower than the base (3V) to get any current passing from collector to emitter. So the emitter might be 2.5 V when base is at 3V and collector is 5V (or greater)"
I cannot get it.
What does mean "the emitter output HAS to be lower than the base"?
Would you please explain it to me?
A couple weeks ago I saw this question. today I remember that I had a question about this question:
http://electronics.stackexchange.co...tor-for-3-volt-base-to-switch-control-5-volts
The reason that Andy pointed out is:
"The reason why a single NPN emitter follower doesn't work is because the emitter output HAS to be lower than the base (3V) to get any current passing from collector to emitter. So the emitter might be 2.5 V when base is at 3V and collector is 5V (or greater)"
I cannot get it.
What does mean "the emitter output HAS to be lower than the base"?
Would you please explain it to me?