TRANSISTOR BASICS 1 ITT HOW TO GET A GOOD GRADE ON THE MOUSE TRAP CAR OCTOBER, 2015.
TRANSISTOR BASICS 1 TRANSISTOR BASICS Lakeland Regional High School October 20, 2015.
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TRANSISTOR BASICS 1 TRANSISTOR BASICS Lakeland Regional High School October 20, 2015
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Transcript of TRANSISTOR BASICS 1 TRANSISTOR BASICS Lakeland Regional High School October 20, 2015.
TRANSISTOR BASICS 1
TRANSISTOR BASICSLakeland Regional High SchoolOctober 20, 2015
TRANSISTOR BASICS 2
WHAT CAN IT DO?
• Although transistors have many applications for now we will be concerned with only a couple of them
TRANSISTOR BASICS 3
MANY TYPES OF TRANSISTORS
• For this presentation we will focus on the Bipolar transistor.
• They can be either an NPN or a PNP depending on the way they are manufactured
TRANSISTOR BASICS 4
NPN AND PNP
• The NPN type have an arrow at the emitter pointing out
• This is in contrast to the PNP type that has an emitter arrow pointing in
TRANSISTOR BASICS 5
Bipolar Transistors
NPN PNP
TRANSISTOR BASICS 6
What do we get out of them? For every 1 ma of current to
the base of the transistor, we usually get 10 to 100 times more thru the collector and this feature is very useful
In the electronics world this translates to a small signal in to get a big signal out
TRANSISTOR BASICS 7
WHERE DOES THIS ENERGY COME FROM?
• Even though we git a big signal out we do not get something for nothing
• Bipolar transistors also require connection to a DC source- this is where the energy comes from
• This does not make them any less useful
TRANSISTOR BASICS 8
What will we do with them? For our lab experiment we will
set up a simple circuit that controls how much voltage appears at the base of the transistor.
We will do this by varying the resistance and thus the voltage
This will control the current to the base which will control the voltage thru the collector
TRANSISTOR BASICS 9
What will we do with them? When we have appreciable
collector current we say that the transistor is “on”
We will measure the base current, base voltage and the collector current
TRANSISTOR BASICS 10
What will we do with them? This will tell us a lot about what
is going on and demonstrate how the transistor is useful
Eventually the transistor will go into “saturation” and we will see that the collector current levels off (or stops increasing)
TRANSISTOR BASICS 11
Resistance from base to ground Base Current Ib Collector Current Ic
