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wrote: You mean, the heater transformer in the 555 case feeds back to... reading the PSU/Scope interface schematics already cost me a pack of paracetamol... guess I'll need another pack... and an A3

First, does there exist a front cover for the 492 Spectrum Analyzer, and, if it does, where can I get one ? Thanks, Dick, W1KSZ ps: santa came early !!

Hi Andy, I will try to help you with some of your questions: be unexpected effects (underload)? You will have an unexpected effect - it won't work. The AC for the power supply, as well as its filament

Hi all, There used to be such a thing as an electromechanical chopper (AKA vibrator), kind of like a relay tuned to operate at many 100's of Hz, or faster. Airpax was a popular manufacturer. Tek used

Hello all. Does anyone in the group know the type of coax Tek used for part number 012-0649-00? Thanks, Joe

Hi all, There used to be such a thing as an electromechanical chopper (AKA vibrator), kind of like a relay tuned to operate at many 100's of Hz, or faster. Airpax was a popular manufacturer. Tek used

The interesting thread about phase shift reminds me of a rule of thumb I have been using for years. 'ELI the ICE man'. Voltage (E) is before Current (I) in an inductor (L). Current is before Voltage

Hi all, recently got my hands on a 555 System in unknown working condition (probably been stored 10+ years). Can anybody here give me good hints from experience on bringing this up without risking

I'm lost with you going down too deep into details, right hand and left hand rule.... Back from school times I just simple memorized (sometimes it's helping to memorize!) - phase shift between AC

I'm lost with you going down too deep into details, right hand and left hand rule.... Back from school times I just simple memorized (sometimes it's helping to memorize!) - phase shift between AC

- Nah, it was just a model to understand the voltage phase relations. I see the old rule of thumb, where you point the current direction in a conductor, with your right hand thumb, and then the

Of course! Its not my picture, I just found it times ago. But the real funny thing here is that it is called "rcinversion.jpg", which is almost exactly what we are discussing here. =) Devine

Arthur is right - +J / -J (math way, vector diagram) is imaginary part what is matter. But there is more - it is who is preceding - is current in front of voltage by 90 deg (i.e. capacitor), or

I think that is a splendid way of looking at it; so much so I wish I'd thought of it myself! I also liked the quote from "Calculus made Easy". I must try to get a copy - I've forgotten most of what I

LOL, Lars! :-D Can I refer to that picture in the future when I want to describe negative attitude? Still LOL! :-D Bill Lars Ahlstr???m wrote:

As Craig and others say, the name is part of the trouble; that and the fact that most people will have been told that a square root can NOT be negative. What do you think of this explanation? We want

Mathematicians actually have a problem with what a number actually means. One is that an integer is an infinite set of all things that have a four-ness. Or Church's lamda calculus, where the integers

Well, it is the fingers of my right hand, when the thumb is missing! But cutting off my thumb is a bit imaginary, while the other fingers are real… =) Interesting explanation of complex numbers

Teachers often have a lot to answer for. My French teacher ("Ma Stench") persuaded me that I was a really useless at French - which I wasn't at all, but it put me off conversing in French when on

¤Ok ok ok…not 180 degrees, I KNOW! Like 60 degrees is a better value to be correct… Im taking all this from memory, so it may be wrong here and there :) -----Ursprungligt meddelande----- Fr?n: