I am completely new to transistors and LABVIEW and i need HELP!!

[thess]

hi all! i am new to Labview as i am in analog electronics too! i have a circuit i need to understand! it's a transistor!! it's ready but i don't get it at all!! can someone please guide me through ? I MEAN STEP BY STEP!! thanks so much!i already studied how it works in analog electronics but when i see it here i lose it! 

i have the vi and screen shots of the front panel and block diagram!! i can sent it by e-mail!

thanks so much again!

[F._Schubert]

Just some small improvements:

Use an enum instead of a ring for 'Device', the case structure will then give you the enum text ('Diode') instead of a number.

Don't use local variables if not needed. Vmin and dV can be wired directly from the terminals.

Tell us more detailed where you're stuck. Ask us questions... 

Felix 

[FraggerFox]

Hi thess,

From your B.D, I can understand that you are trying to simulate the drain current formula for transistor:

Id(Drain Current)=Is(Source current) * (exp(Voltage/freq*threshold voltage)-1)

The vi would be plotting the drain current data on the graph. The x-axis units would be separated by values specified by dv starting with Vmin.

V min would be increasing as per the dv values and the while loop would stop as soon as Max. Voltage(Vmax) level is reached.

Hope this helps 🙂

[thess]

yes that's what i was looking for!! thanks so much! now i must see how it's done in the block diagram!! what does every gate and every loop do!!! step by step!! thanks for your help again!!!

[F._Schubert]

Turn on highlight execution mode (the ligth bulb). Then run the vi (run arrow). No you see it executing. You also can step thruusing the stepping controls next to the light bulb.

Felix 

[thess]

thank you too!!! you both helped me a lot!!! see i am too rookie at this i may sound a bit silly!! i guess electronics  are not that easy for girls!!

thanks again!!

[johnsold]

Whether electronics is easy or not has nothing to do with whether you are a girl!  It has much to do with what kind of education you have had, your attitude, and how much effort you are willing to put into understanding.  In far too many cases primary education is more about social conformity and passing standardized tests than about actually learning anything.  If your first arithmetic teacher did not understand or like mathematics, she may have left her students with an attitude that subjects like math and science (which are the precursors to later electronics courses) are too hard.

Anyone who teaches Id = Is*(exp(V/(n*Vt))-1) in a beginning electronics course is confusing members of the class with irrelevant device physics rather than teaching electronics.

Of course you have no control over what you were taught in the past or what is being covered in your current curriculum. However, you can control your attitude and approach to the assignments.  Keep trying to work the assignments and to learn what you can.  Ask specific questions.  Members of the Forum will not do your homework for you but we love to answer specific questions and to help people learn.

Lynn 

[thess]

sorry to bother you again but another question poped out while studying the block diagram!! in the loop we add 273 to convert celcious degrees to kelvin. so far so good!  the output of that is multiplied by 1.38E-23!!! why???????????????? after that and a divide process i get the V threshold right? can you please help me one more time?

[thess]

i don't want anyone to do my homework for me Lynn. you got that wrong! i am just trying to understand some things as electronics with Labview!!! you are not obligated to help me or even bother at all with my post! sorry for your time and have a nice day!

[AnalogKid2DigitalMan]

Where is Mr. Boltzmann when you need him, I think he may have the answer 🙂

-AK2DM