Recent content by Firefox123

Okay I have been thinking about this a bit more... And now I am thinking it is not due to the transformer saturating... I think it is the transistor. Once the transistor saturates we have maximum current flowing through it...so the current stops increasing and is constant...this causes...

In my short career...I have found that to usually be the case. I think you are right...I also think this is why the OFF time of the transistor is so short compared to the ON time...the reverse EMF quickly dissipates and the process starts all over again... That looks wrong to me also...

Jim...thanks for the reply. I need to think about this more, but on a first look I think this might be what is happening. Thanks again!

Anyone have any thoughts on this?

These two websites: http://www.increa.com/reverse/dc/ and http://thesignalpath.com/blogs/2011/06/12/camera-flash-circuit-and-nixie-tube-tutorial/ have very similar circuits for a standard camera flash circuit...and overall do a decent job explaining them. There is one question I...

This is not a homework question...I am not a student. Please refer to the PM I sent you a few moments ago.

How does todays "modern" form of Maxwells equations differ from the original equations Maxwell developed and why? If this should be in the physics section...please move it...

IR Detector Question... If someone take an IR sensor and puts a red covered piece of plastic over the sensor...is that really going to significantly affect the performance? A friend of mine has a laser detector for road use and it appears to have a red plastic cover over the IR sensor...

Okay...so here was the original problem I had... So I'm reading about beat frequency and I see a few examples using say 98 MHz and 99 MHz or 98 KHz and 99 KHz...when you look at the combined waveform made by adding the two frequencies you can visually see the beat frequency as a 1MHz or 1KHz...

Gotcha... That answer makes sense.

Thats nice...so have I. Unfortunately none of those are what I am talking about. And you won't...because it doesn't create new frequencies. An "envelope" isn't a new frequency...you won't see it on a Spectrum Analyzer...you need some kind of a detector to "pull" the envelope off. Believe...

At this point yes...I'm fairly sure. They all seem to define "beat" frequency as the difference in the two frequencies and most of them relate this to the "envelope"...in fact they say it is the envelope. Do a search in some EE or physics textbooks or do a google search on beat...

Perhaps...this does sometimes occur...but that would imply that the majority of sources from what I have read are incorrect on this issue. If that is the case...then what is the definition of "beat frequency" and how is it related to the "envelope" of adding two signals together?

Okay...no disagreement there... Nice picture...I was basically doing the same thing, but in Excel... Right...I agree that there is no 100 KHz or 98 KHz output. A Spectrum Analyzer will simply show the two original frequencies... But the sources I am reading are claiming that the...

Mixing and modulation both create sum and difference frequencies because modulation usually incudes mixing as part of the process... Using RF terminology, when you multiply or "mix" two signals with frequencies f1 and f2 you get the sum and difference frequencies...you can see this...