Behavior of Circuit

kingofjong · Jul 6, 2018

Hi

I was wondering if any one could explain the behavior of the transistor circuit pasted bellow. I am giving the collector a pulse that is 0.6 seconds in length and the emitter produces a pulse that is 0.3 seconds in length. I was wondering why the pulse gets shorter.

alec_t · Jul 6, 2018

Because you are giving a 0.3 sec pulse to the base.

crutschow · Jul 6, 2018

That's an emitter-follower circuit.
Why are you pulsing the base and collector with different pulses?
What do you expect the circuit to do?
Normally you apply a constant DC voltage to collector and, when you pulse the base, you will get the same the pulse (minus the base-emitter voltage drop) at the emitter output.

kingofjong · Jul 7, 2018

Hi

I was hoping the collector output would show up and start at 1.2 seconds. Usually in NPN transistors current flows from collector to emitter?

Thanks

crutschow · Jul 7, 2018

kingofjong said:
I was hoping the collector output would show up and start at 1.2 seconds.

What do you expect the "collector output" that "shows up" to be?

Nigel Goodwin · Jul 7, 2018

kingofjong said:
Usually in NPN transistors current flows from collector to emitter?

It flows where ever you design it to do so, and depends on what you consider current flow?.

ronsimpson · Jul 7, 2018

Nigel Goodwin said:
It flows where ever you design it to do so

It flows by the laws of Physics. Your design, is what you want it to do. When your design does not work the way you want, then you probably are butting heads against a law you don't understand.

Nigel Goodwin said:
what you consider current flow?

There is a continual fight over if current flows from + to - or from - to +. (electrons are negative)

kingofjong said:
I was hoping the collector output would show up

Because the Collector is connected to V2 the collector voltage will look just like V2 voltage.

gophert · Jul 7, 2018

ronsimpson said:
It flows by the laws of Physics. Your design, is what you want it to do. When your design does not work the way you want, then you probably are butting heads against a law you don't understand.

There is a continual fight over if current flows from + to - or from - to +. (electrons are negative)

Because the Collector is connected to V2 the collector voltage will look just like V2 voltage.

Electrons are negative, true. If you want to talk about moving electrons, you should be calling it "electron flow". There is no doubt in my mind that Positive current flow is from + to - and anyone who wants to argue over it is a pedantic idiot and not worth my time. (I realize you are just clarifying - and clearly not an idiot - but have you seen the "textbook" on that other Electronics website? What a bunch of tools over there).

ronsimpson · Jul 7, 2018

gophert said:
bunch of tools over there

Tools are every where.
Most people think I am a .......

The current flow question is much like the bank and I. I think in $ and the bank thinks in debt. So debt flows from one person to another very much like money flows but in the reverse direction.

gophert · Jul 7, 2018

ronsimpson said:
Tools are every where.
Most people think I am a .......

The current flow question is much like the bank and I. I think in $ and the bank thinks in debt. So debt flows from one person to another very much like money flows but in the reverse direction.

Too bad you can't just switch the leads of the meter on the bank account values to turn those frowns upside down.

Behavior of Circuit

kingofjong

Member

alec_t

Well-Known Member

crutschow

Well-Known Member

kingofjong

Member

crutschow

Well-Known Member

Nigel Goodwin

Super Moderator

ronsimpson

Well-Known Member

gophert

Well-Known Member

ronsimpson

Well-Known Member

gophert

Well-Known Member

Similar threads

Behavior of Circuit

Member

Well-Known Member

Well-Known Member

Member

Well-Known Member

Super Moderator

Well-Known Member

Well-Known Member

Well-Known Member

Well-Known Member

Similar threads

Privacy & Transparency

Privacy & Transparency