Recent content by Abdul Wadood

http://www.scribd.com/doc/188876445/How-to-make-a-Lock-in-Amplifier I hope this link helps. The pdf file was bigger than the limit Physics Forums allows.

This summer I was again tasked with the Lock-in Amplifier project. This time I gained a much better understanding of the electronics. And now in my 5th semester, I'm taking Electronic circuits and devices and Communication Systems, I keep having flashbacks of my summer work. Here's the link...

Thanks a lot every body for sharing your ideas. I'm sorry for such a late reply. I did manage to understand the Lock-in amplifier and make one in September 2012. here's the linkhttp://physlab.lums.edu.pk/images/3/3c/Lockin_Sultan.pdf. I'll be pleased to hear your feedback on it.

@gnurf No worries. I might have been posting the questions without self-effort. After some pen and paper and reading, i did get the hang of the thing. Thanks for your ediction. Now I am driving the AD630. And I've tried to multiply the sine and the square. Problem is that I'm not getting the...

@the emi guy That was an awesome explanation. Really cleared the picture as to what does the DC signal signify. Now 2 more questions: 1)How do I interpret this DC signal that the lock-in amplifier generates? How is it(mathematically) related to the modulating signal or our signal of interest...

Hello everyone I have completed my freshman year in EE. For the summer, my professor has asked me to design a lock-in amplifier. First he has asked me to read about AD630. Now after reading the datasheet at (http://www.analog.com/static/imported-files/data_sheets/AD630.pdf), I was a bit...

I am a first year Electronics Engineering major but desperately wanted to do a Physics major(my parents said no because of less money in Physics). My mind works theoretically and is averse to technology. I wanted guidance on hohw can I preserve my 'Physics spark'?Especially how to study Physics...

exactly. -9 would be neutral but not equal to zero. all the treatment depends on the parts of numbers.

-3*3 would be a 9 which would be neutral, like zero. It would neither be positive nor negative because its positive and negative parts would be the same. In this system, (2+2) is different from 4 because the PARTS of (2+2) are ¥ more than parts of 4.¥ would be the largest number you would...

Thank you very much for such a positive response. 1. Infinity in this discussion would be any arbitrary number that you choose. You can consider this as the largest number you would require in a given problem. Just don’t go beyond it. That number, which is practically large to suffice for all...

Well I have developed a number system which allows the existence of imaginary numbers. Please visit it at : http://www.scribd.com/doc/46064105/Math-Paper. An intro of these ideas is presented at :http://www.scribd.com/doc/46117043/Introduction-to-My-Research-Paper Please provide me feedback...

Homework Statement I know the definition.where could i find detailed information on unit vectors? Homework Equations The Attempt at a Solution

Homework Statement I mean to say that what a vector is?and what was the need for it? Homework Equations The Attempt at a Solution