resistor symbol dilema

Everyone I know says some variation of "point one microfarad." or "point one oof (uF)." I do prefer nanofarads, though. It is silly to skip a metric prefix when discussing capacitance but not when discussing time.

Since the base unit for marking caps is the pF (a cap marked 104 is

100000 pF or 100 nF), I think we should create a new unit called the 'Fad' (shortened Farad) with the Latin 'f' (?) designated as the unit symbol. Then we can have m?, ?, k?, M?, and G?, and be consistent with resistors. (sorry if the unicode doesn't show up properly)

Of course, then we'd have to do something about Henries too. Maybe define 1 uH as a 'Hank' with symbol 'h' . . .

(Tongue very firmly planted in cheek). :))

--
Tim Hubberstey, P.Eng. . . . . . Hardware/Software Consulting Engineer
Marmot Engineering . . . . . . .  VHDL, ASICs, FPGAs, embedded systems
Vancouver, BC, Canada  . . . . . . . . . . . http://www.marmot-eng.com

"Spehro Pefhany" schreef in bericht news: snipped-for-privacy@4ax.com...

Or use what you use verbally. Do you say 'one-hundredth microfarad', or 'ten nanofarad'. It seems that 'one-hundredth microfarad' is verbally close to 'one-hundred microfarad' ;)

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Thanks, Frank.
(remove 'q' and 'invalid' when replying by email)

Hello John,

I think the inventor Pieter van Musschenbroek called them flasks. Or "flessen" in his language. Now those were real capacitors, er, condensers that could store the electrical ether. People did some scary experiments with them:

Regards, Joerg

According to IEEE Std. 315, both symbols are OK with both the IEEE and IEC. Sorry, no decisive answer here.

The symbols should not be mixed within a drawing, but other than that either is perfectly acceptable.

Personally, I use the zig-zag. I use rectangles for functional blocks like integrated circuits.

IEEE-315 and 315A are good references for your case because they also show IEC symbols, so you can produce a schematic that is acceptable on both sides of the pond.

================================

Greg Neff VP Engineering

*Microsym* Computers Inc. snipped-for-privacy@guesswhichwordgoeshere.com

I read in sci.electronics.design that Joerg wrote (in ) about 'resistor symbol dilema', on Mon, 7 Mar 2005:

Yes, 'flessen', but we call them 'Leyden jars' in English, and in particular the Royal Navy used the jar as a defined unit of capacitance up to the mid-1930s.

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Regards, John Woodgate, OOO - Own Opinions Only. 
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk

I read in sci.electronics.design that Tim Hubberstey wrote (in ) about 'resistor symbol dilema', on Mon, 7 Mar 2005:

You are about the 10^6th person to suggest that, with varying names for the unit. There was a huge discussion about this in the 'trade press' around the time when the metric prefix 'pico' was introduced.

--
Regards, John Woodgate, OOO - Own Opinions Only. 
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk

Hmmm. I wonder how much of a HV charge a CRT could hold. Enought to give one a jolt and make them drop the tube?

I read in sci.electronics.design that Guy Macon wrote (in ) about 'resistor symbol dilema', on Mon, 7 Mar 2005:

More of a JOLT!!!. Might make you drop more than the tube.

--
Regards, John Woodgate, OOO - Own Opinions Only. 
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk

Well, the good thing is we have standards. As an IEEE member I thought Standards were supposed to be exclusive.

What was the reason that $M160 NASA Mars probe crashed, again?

j.

"John Woodgate" schreef in bericht news: snipped-for-privacy@jmwa.demon.co.uk...

Makes sense. I use 'four kay seven' for resistors, and 'two comma two microfarad', but drop the farad when I get down to 'ten nano' and '10 pico'. And let's not forget the variations that have 'oops' in front and the verbal equivalent of bold typeface ;)

--
Thanks, Frank.
(remove 'q' and 'invalid' when replying by email)

I read in sci.electronics.design that Terry Given wrote (in ) about 'resistor symbol dilema', on Fri, 11 Mar 2005:

Radio/Radiotron Designers' Handbook (F Langford-Smith) is one of the more useful things to come out of Australia (;-)

Almost every 'Wireless World'/'Electronics World' from 1952 to date.

I used to have 'Second Thoughts on Radio Theory' by 'Cathode Ray' (M G Scroggie) but someone 'liberated' it.

'The Art of Electronics', with the Student Manual.

Yes; just because a book is old, it isn't necessarily useless.

--
Regards, John Woodgate, OOO - Own Opinions Only. 
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk

Certainly. Back when I was a video game technician (1987 or so) I worked for a company that made videogames. One summer I was moving a 26" tube, sans shirt (it was hot). I foolishly picked up the tube with the EHT socket close to my belly, then went walkabout. About 5m from my destination I got the inevitable belt - the tube had been fired up several days earlier, and never discharged. Aware of the cost, I struggled not to drop it, and got a second belt in the process. I made it to the bench, then proceeded to curse mightily. I made a point thereafter of pointing the EHT hole away from me when carrying tubes.....

I also got a belt from one on my test rig, and promptly snapped the neck off the tube in response. ouch.

Cheers Terry

John Larkin wrote: [snip]>>>I wonder when the Brits and Australians cut over to boxes. I have a

Hi John,

what are your favourite/most useful electronics books?

I just got a copy of Hendrik Bode's "Network Analysis & Feedback Amplifier design". very informative.

Cheers Terry