Aww,man,this is not a homework.As you can see,all the equations are there.I can even provide the step by step answers.It just that the text plainly stated the VA burden as 1 VA and relay setting as 0.1A,which I don't understand where they came from.
The final answer would be 400 ohm for the...
Hi,
I am going through some texts but it was not very clear.I hope some experts here can help me on this.
The max voltage across the relay and stabilising resistor is given by;
(If/N)(Rs+Rb)
where If - max short circuit rating, A
N - current transformer, CT ratio
Rs - CT internal...
Hi,
I am doing my revi[FONT="Arial"]sion and one of the question got me thinking but I am not sure if I got it right.
The question asks what is the effect of variation of steam supply on power output,power factor,armature current and load angle of the synchronous machine.
I think...
Nope,the lab doesn't have a frequency counter.I think the oscilloscope will work just fine.
By the way,I did try the common emitter configuration but the signal was only recognized at a very close distance(probably of different frequency).The current to the IR emitter was good.I didnt measure...
Hi Mike,
So the limitation is actually on the timer output?
Vout timer = Vb+Vbe+IeRe+Vled
Ie=(Vout-Vb-Vbe-Vled)/Re
So if this Ie cannot increase,Ic will not increase too.
So if I raised Vcc to 24V,the extra voltage will dropped at the CE junction of the transistor and hence the heat...
I am sorry but I still don't understand:shy:
Yes,I can understand that diode characteristic curve.
The confusion was why the current didnt increase.If I am not mistaken,the VCE is suppose to goes low once the transistor on.I don't think the transistor is faulty because it was working fine...
I am sure I am measuring the current correctly.Yes,there was no significant increase in current when i raise my voltage from 12V to 24V.
The problem was not with the IR emitter.The reason to increase the current was to increase the brightness of the led and thus improves the distance of...
Hi,
Can anyone help me check the circuit and if possible tell me what could be the problems?
At 12V supply,the circuit works fine and I am getting approx 60mA with resistance 100 ohms.
Now I wanted to increase the current by reducing the resistance to 50 ohms.And I got 115mA.
Since...
Hi,
Can anyone recommend me any free video editing software.I have some avi video clips which I want to edit.I want to circle some objects on the video and add in texts as the video clip plays.
I saw some people doing that in youtube.Anyone can tell me what software they using?
I did not apply the state to state analysis.I only have the .cxp and .opt file right now.I will need to request to have the PLC ladder diagram to be printed out since I don't have the software installed at home.
I have done state diagram in my electronic system design but I am not sure how...
This is a school project.
Of course,I would like to get everything nice and tidy.However,I need to put off some of the work due to time and cost contraints.I still have 2 other very tough subjects - Electrical power and electronic system design to focus on.
Hi,
So,my only option is to use reflective optics?But what about getting better and stronger IR led?What parameter that I should be looking for at the datasheet that say this LED can shoot,say above 10 metre.
Regarding the PLC program,I don't think I have the time to fix it. The problem...
Hi,
I have 2 questions here and hope some experts can answer them.
Question 1:
How to improve the signal distance of the IR led?What parameters in the datasheet that we should look into?
I have purchased few IR leds but all of them can't shoot more than 3 metres. I noticed increasing...