hi everyone, long time no see

I have a problem...

if you have a tran and use it as a switch, does a current still go through if there is nothing on the collector but there is a high current on the base?

Because that is what i am getting with this 639 transistor

thanks

 

Schematic please.

 

Hello,

Can you post a schematic of what you are talking about?

Greetings,
Bertus

 

if you have a tran and use it as a switch, does a current still go through if there is nothing on the collector but there is a high current on the base?

That sounds a lot like a shorted transistor.

What is the magnitude of the base current?

 

If it is an NPN transistor, then with no collector resistor, the base emitter junction, acts as a forward biased diode, and all current through the emitter flows out the base, which would upset input signal sources.

Also if input is large enough then the collector base diode becomes forward biased, and a positive signal out the collector would result, but it would be limited by the current flow through this diode junction.

This is not normal current flow through the transistor.

Is this the current flow your talking about.

If not then like "beenthere" said in the above post, it could be a shorted transistor .