Hi,
Does between the emitter and collector have any conducting while its idle???

Thanks.

 

Are u on some kinda medication ?

 

Maybe this will help.

http://www.electronicstheory.com/html/e101-47.htm

... but I'm not sure...

 

Medication? No.
Please more answers...

 

To answer your question, yes, there is a small amount of leakage current when the transistor is off.

 

It can be very small however. Small enough to treat as an open switch.

When discussing transistors it is important to remember there are several families. I assume you are talking BJT in this case, given you mentioned Collector and Emitter.

The early transistors, made from germanium, were much worse. The new ones are much better. BJTs are fundamentally analog devices, even if they can be run in their digital regions. Something to remember.

 

Im talking about BC547 and BC557..

 

Usually a transistor is turned off by something connecting its base to its emitter, maybe a resistor. Without something between the base and emitter then a very small collector to base leakage current is amplified by the transistor and it conducts much more current than with something connecting its base to its emitter.

 

Thanks everyone, I Think I Got it...
If you have more information please tell me, Thanks.

 

Just curious, are you going to school, or are you self taught? I was messing with electronics many years before I went into college. I had holes in what knew until a more formal education.

But I still had fun. I was even etching my own boards.

 

Hi,
I am not learning electronics....
BTW, Im etching PCB also
With Toner Transfer method, or free drawing with marker....
BTW, Its great forum, fast answers, and very good people....

Thanks.

 

With questions like that you are.

This is OK, we like questions, and no one is born knowing this stuff.

I assume you've seen this article?

How I make PCBs