Recent content by -SJ-

Thanks for the link. ExpressPCB looks like interesting program for a rapid prototyping. Unless gerber data export is a need.

I am not familiar with PCB Elegance but it looks really like "sit and work". Altium takes a couple of week to mastered it due to my first impression. But supposedly the most hard to learn program for me is OrCAD by Cadance which we were taught at school. Hence I've grew up at Eagle as probably...

Hello, what PCB Design program do you prefer? What's the reason for your choice? I am freshman to PCB design and working on PADS from Mentor Graphics. But I have to admit it seems me a little bit unintuitive and I am unhappy with non-perfectly fitting transmission lines and prolonged editing...

Thank you for the answer. I think I can understand now. Thanks a lot.

That's another thing I would like to ask. Can be said how large amount of time in average this takes? I suppose it depends on a state orbital, is there any suitable equation? I am sorry for my english, I am still working on my improvement. What I had in my mind was if can electron absorbs an...

Hello, I am wondering about a photon absorption/emission by an atom. We have been told at the university an electron is excited up in Bohr's model if an atom absorbs an energy in a form of photon. What cause an electron release an energy and falls down in Bohr's model? Does not an atom...

That Uce should be typical. The KFY34 transistor has Pmax=800mW, so 440mW should be fine and no additional cooling is necessary. OK, that's it. I'll send it to my examiner to check it out and be with hopes he will accept it despite the terrible time spent at solution. I would like to say THANK...

So, for Uce_sat=1,1V should be the P=Ic*Uce=400*1,1=440mW, right?

Sure, I was reading from this one posted here: http://www.datasheetarchive.com/dl/Scans-048/DSAGER000349.pdf Page 21 and 22.

I've look into the data sheet and although I haven't found there graph Ube depending on Ib, I've saw there Ube_sat=1,1V and Ube=0,75V for Ic=400mA. Which of these values should be chosen? Why is the voltage over the junction current depending?

I've amended the last graph to 1,5V but is with this correction Ube remained or changed to 1,5V also? d)It might look like something like this: P=Ic*Uce_sat=400*1,5=600mW? Pmax=800mW, so no additional cooling is necessary.

I can open it. Perhaps, try this: http://i61.tinypic.com/2yy8hg3.jpg

I've tried put something down to the paper. Could it be correct? http://imagecurl.org/images/47046344738916113129.jpg Thanks for your sorely tried patience. :smile:

Perhaps, don't be the square signal deformed by capacity barrier of the transistor? In that case I would be able to sketch it from memory, but without exact time-depending values.

And that's exactly what I am confused by. It's a homework and I am not at school anymore. We are not allowed to use labs for our HWs and I haven't heard anyone ever was. Oscilloscope is an expansive device and far not everyone own it. It must be another way how to plot the graphs...