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Old 27th February 2010, 12:55 AM   #911
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I think we made very good capacitors in the 60th and 70th. I still have to find a better cap then the Röderstein KP1822.
Today we are still making good raw material. I talked to RTI that make caps for us and they buy the foils in Germany. Brian Daily has just specked an oil filled Teflon ! cap for bypass in our speakers.
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Old 27th February 2010, 01:07 AM   #912
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Quote:
Originally Posted by Joachim Gerhard View Post
Hi Scott ! Could that work any better? The double Fet i am using has 10 - 20mA Idss (LSK389C) so it could swing enough voltage into that load. I am showing only halve of the circuit for simplicity. The OP´s are AD797.
http://www.linearsystems.com/datasheets/LSK389.pdf
That would have a much better chance of working, the signal levels are so low that op-amp followers are just a waste of devices.
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Old 27th February 2010, 01:12 AM   #913
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Americans are intellectually lazy as a group, but when motivated, they learn fast
Radar? How about the development of the B17 and the P51, 117 days start to finish! Are you some kind of self hating American (please apply liberal smilies here).
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Old 27th February 2010, 03:23 AM   #914
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Thanks for the sugestion on the fet buffers. I will try that idea out.
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Old 27th February 2010, 04:08 AM   #915
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As I said, before WW2, our science and engineering in the USA was mostly geared to make more cars, etc, more cheaply. Radar was invented by the British, I am pretty sure, and for a darn good reason. This was more 'basic research' than engineering, at least at first. The British scientific establishment has always been among the very best. However, engineering has been sometimes lacking. Look at 'Darkness by Lucas', etc
When it came to electronics, especially solid state, we Americans were way ahead of the game, even in the 1960's. We were designing complementary symmetry pp throughout power amps, before the British were even into dual supplies, for the most part. I have more evidence, but so what? The best book I have on fet design is British. The best idea I ever got from an article was British. And so it goes.
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Old 27th February 2010, 04:55 AM   #916
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I worked with Malcolm Hawksford in Essex. That changed my life.
I was also a big fan of Peter Walker. Never liked his electronics much ( ideas where briliant, but execusion so so) but owned the ESL57 for 7 years and even build an HQD system with Levinson crossover and Threshold Stasis amps and NS10 preamp.
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Old 27th February 2010, 09:29 AM   #917
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From ideas to execution there is always the $ multiplier making a difference.
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Old 27th February 2010, 11:59 AM   #918
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I heard that it needs 20 years in germany until an invention, for example made at a university, is put into a commercial product.
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Old 27th February 2010, 12:45 PM   #919
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Not in germany, but maybe where you live, in the Sauerland behind the mountains.

Reinhard
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Old 27th February 2010, 01:14 PM   #920
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From ideas to execution there is always the $ multiplier making a difference.
Right you are, both radar and JFETs were invented in Germany decades before they were useful. The inventors usually get more credit than the ones that bring it to practice.
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