Recent content by aeftimia

I was just getting started with RF signal processing, and I was very interested in being able to make an oscilloscope and function generator work in real time with python. Essentially, I would like some means of: *Creating arbitrary waveforms defined by a numpy array (or sending out individual...

I thought I had a good understanding of transistors, but I have seen articles on how to tell the collector from the emitter. I had always pictured transistors as a perfectly symmetrical device. Either side could be the collector, and the opposite side was the emitter. Clearly, there is some...

I am trying to understand how some of the standard ICs work in terms of simple components I understand, i.e. transistors, resistors, capacitors, and inductors (although I doubt there are any inductors in an IC.) I was trying to build and op amp from transistors, resistors, etc, and I noticed...

I know the best way to go is to get the thing built on a chip. I was trying to understand how the chip works in terms of components I understand--i.e. transistors, resistors, capacitors, and diodes.

I posted that second question on a new thread here: https://www.physicsforums.com/showthread.php?p=3506562#post3506562

In short, if I want a given frequency, and I use BJT transistors, what would be the optimum capacitors and resistors in a multivibrator. Example: http://upload.wikimedia.org/wikipedi...tivibrator.svg So, what are the optimum values C1=C2, R1=R4, and R2=R3?

Thank you very much. As I followed your description on the circuit simulator, I could see everything you described happening. I suppose I could come up with a way to have the multivibrator connect to a different power supply. However, this begs the question (which perhaps should be a new...

I modified an astable multivibrator to send an alternating current across a load (square wave centered at 0V), given a DC power supply. The multivibrator is connected to to the load through an H-bridge and the multivibrator alternates which switches are on and off via transistors. The point is...

Thank you. After some time studying the circuit (and watching it with Falstad's impressive circuit simulator) I have a working astable multivibrator. That is perfect. I will work on changing the waveform next. Thanks again!

How to build a DC-->AC converter using resistors capacitors and diodes (no inductors) I have been trying to learn electronics (I am familiar with the principles, just have no experience designing complex circuits to fulfill purposes), so I went to RadioShack, got myself: breadboard assorted...

Well, consider what happens under a unitary transformation when dealing with finite matrices. Say you have unitary matrix U, and you are transforming matrix H. U^-1 HU is the unitary transformation. Recall a unitary matrix is composed of orthonormal columns. This means its adjoint is its inverse...