Transisters? switch parallel

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namit

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From my understanding transistors can be used for amplifying and switches.
What i am interested in is the switching (either on or off).

I have a switch at the moment (sorry for my explanation my terminology is a bit off)

From parallel port cable comes out to a transistor. middle leg is connected to cable coming out. Negative side goes back to the earth on the parallel port.

So when i send a signal from the parallel port. (not sure how do this yet) the transistor will close the switch turning on the device?

Also what should i ask for or look for to buy?

Can i do this.
 

You can connect a transistor (BJT or MOSFET) to any data pin of PC's parallel port and control it's stage using simple QBASIC instructions:
**broken link removed**
or, if you would like to control pins using different programming languages:
**broken link removed**

a transistor. middle leg
Click to expand...
Th middle leg in power transistors is the BASE (BJT) or GATE (MOSFET) ..
So, it can be connected as per attached picture ..

And you are in business ..

Regards,
IanP
 

Thank you very much this makes a lot more sense.

How did you draw that picture?
 

This picture was imported from a website and edited with PAINT ..
In this way almost any picture can be opened and bits and pieces can be added or removed ..

Regards,
IanP
 

How much voltage do i need to close the transistor?
 

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