carrots

[Gasboss775]

On the subject of radioactivity. There was a radioactive tube that was used as a current source or current regulator, I thought that it was called a Corpustor tube, but I can't find anything online searching for that term.

 

[jpanhalt]

I didn't find that term, but I did find something many of us may not have known: https://www.orau.org/ptp/collection/consumer products/electrontubes.htm

Look at how recently such tubes were used (list near the bottom).

John

 

[Gasboss775]

There were also those glow in the dark clocks with their hands coated with a radioactive paint. I forget which radioactive element that was used in them.

 

[jpanhalt]

Ah yes. That was a well-known danger. Primarily women were employed to paint the radium dials, and they licked the brushes to make a fine point.

Here's a link: https://en.wikipedia.org/wiki/Radium_dials

John

 

[Gasboss775]

I found reference to the corpuster tube in the Wikipedia entry on current sources:

"
Curpistor tubesEdit
Nitrogen-filled glass tubes with two electrodes and a calibrated Becquerel (fissions per second) amount of 226Ra offer a constant number of charge carriers per second for conduction, which determines the maximum current the tube can pass over a voltage range from 25 to 500 V.[7]"

And now of course I realise that my spelling was wrong!

 

[large_ghostman]

DOH, the smell thing just came to me!! ESTERS, made from a carboxylic acid and corresponding alcohol. Not all are done this way but its common. I should have remebered this as I have made loads in the search for nice smells.
there is a basic table here https://jameskennedymonash.files.wordpress.com/2013/12/table-of-esters-and-their-smells.jpg

 

[jpanhalt]

Yes, esters are certainly important in aromas, but there are many other classes. Terpenes are another (clove, rosemary, and so forth). If you can find this book, it may interest you:

H.-D. Belitz, W. Grosch, P. Schieberle, Food Chemistry, 3 rd ed., Springer, 2004. There may be a 4th edition out by now. Just checked, the 4th edition is available: https://www.amazon.com/Food-Chemist....-D.+Belitz,Grosch,Schieberle,+Food+Chemistry

It is a good resource, nicely referenced and shows chemistry, not just chemical structures.

John

 

[Gasboss775]

Another interesting group of aromatic compounds is cat attractants

Anyone with a pet cat will probably be familiar with their pets fondness for catnip. Cat attractants are a whole group of compounds that have a similar affect on the domestic cat.

 

[granddad]

A hose pipe I find is a good cat repellent ... actually a hell of a lot of pussies have gone missing around my estate , Not me , think it is a fox.

 

[large_ghostman]

A hose pipe I find is a good cat repellent ... actually a hell of a lot of pussies have gone missing around my estate , Not me , think it is a fox.

Tends to be anti freeze in these parts. or the dog.

Yes thanks John, it was esters I was trying to remember the other day and my mind went blank for last couple of days. Stupid as it wasnt long ago I was doing some!!

Talking of editions, anyone got H&H the ar of Electronics 3rd ed yet? I heard it was full of mistakes
I only got the second ed but think I will stick with that for now. Until abe books turns up a silly cheap one eventually

 

[jpanhalt]

I have the 3rd , but have not read it carefully enough to find mistakes. For me, it is a reference book, not something I plan to read cover to cover.

John

 

[Gasboss775]

Tends to be anti freeze in these parts. or the dog.

I understand the poor moggies are attracted to the sweet smell of ethylene glycol ( antifreeze )

Talking of editions, anyone got H&H the ar of Electronics 3rd ed yet? I heard it was full of mistakes
I only got the second ed but think I will stick with that for now. Until abe books turns up a silly cheap one eventually

I bought the 2nd ed at full price and have no regrets, however that was when I was single and without dependent children. Paying full price for something like that now would be out of the question.

 

[4pyros]

Talking of editions, anyone got H&H the ar of Electronics 3rd ed yet?

You may be right LG about this book. You can get copies naturally but I don't condone this.
I think analog electronics is a dying breed .
It can be so elegant and satisfying, when worked out for yourself, as opposed to buying a chip and living with its constraints.
In an analog world you have full control over everything!!

 

[Gasboss775]

I think analog electronics is a dying breed .

Perhaps, though it could be said that digital electronics is a specialisation of analog electronics and knowledge of the effects of inductance, capacitance, resistance on the performance of digital circuits is still very much necessary. If you are talking about the downfall of discrete design, you may be right, though in the realm of HiFi amplifiers, discrete is still regarded as the superior choice in many cases.

 

[large_ghostman]

The third ed has microcontrollers and digital in it!! Its only taken 30 years to update but apparently its fully updated for the modern world.

The official (I think) Errata for the 3rd edition is here https://artofelectronics.net/errata/ they are asking readers to report errors and future copies will be released to paper copy owners pdf's. Apparently the paper copy uses cheap thin paper and some reviews are saying all things considered its a poor book when compared to the second edition. As for those who would like a legal copy I have found you a bargain or two. I cant afford it myself but I have the second edition and to be honest I am more than happy with that.

Here are some bargain I expect to go quickly

https://www.amazon.co.uk/gp/offer-l...1453814016&sr=1-1&keywords=art+of+electronics

 

[Gasboss775]

The third ed has microcontrollers and digital in it!! Its only taken 30 years to update but apparently its fully updated for the modern world.

The 2nd edition had three large chapters dedicated to digital electronics, admittedly the information is quite dated now though a lot of the basic principles remain the same.

 

[Gasboss775]

to go quickly

https://www.amazon.co.uk/gp/offer-li...1453814016&sr=1-1&keywords=art+of+electronics

That's a nice surprise, thanks LG.

 

[large_ghostman]

I havnt seen the third so its not personal experience but I am told the 3rd is pretty upto date. I like my 2nd edition, I love real books and they eventually always turn up cheap as ex library books etc. I am not a kindle person I love proper books.

 

[large_ghostman]

That's a nice surprise, thanks LG.

Your welcome, the other day there was one with the preface page missing but the rest of the book was as new, it was only £12! with £3 p&p. I always watch for bargains book wise, also they have some cheap copies of the learning version and student version, but I figure most on here would be after the normal 3rd edition (if that makes sense).

 

[granddad]

So true...