What are you doing, working towards a degree in social work?
John
We owe it to our creator to make some effort to correct the misguided ;-)
...Jim Thompson
From past posts, I'm guessing he's shorter than both of us ;-)
...Jim Thompson
Relax: you're quite safe.
John
They were whisker types - not PN junctions. Ge had most - as it was high frequency and Si wasn't.
Yes there were PN diodes but mostly whisker - in the late 50's. Limited use and not for high rel at all.
C> >
Every one forgets the Cold war. B-36's and B-52's and such were all vacuum tubes. EMP and radiation didn't wipe them out as semiconductor was. Transistors were in the 40's post war at Bell Labs. Nobel time.
I looked over my MIL books and didn't find a semi in power supplies or in radios or detectors...
I think MIT and Bell Labs were experimenting with the new stuff as a sight into the future.
Diodes - point and semi were in use but radios were miniature vacuum tubes and turned transistor in 57.
TV sets used selenium rectifiers stacks for years before Semiconductor were able to make ends meet. I think the big break for them - the electronic terminal and smart printer in the 70's and 80's.
Mart> >
The EMP became an issue in the 1960's after the nuclear test above the Pacific, so it could not have influenced the much earlier B36/47/52 designs.
Apparently the semiconductor diode reliability was not very good since some early computers had a lot of problems with semiconductor diode reliability. For instance ENIAC had nearly 18000 tubes but only 7000 semiconductor diodes. If I had to design a computer with tubes and diodes today, the amount of diodes would be at least ten times the amount of tubes.
For microwave receiver applications, if you do not have a good low noise RF amplifier, a point contact diode mixer is a reasonable alternative (often driven by a LO frequency multiplying chain) to get a reasonable system noise figure/temperature.
Paul
Not tall, not short... close to 1.0 SPunits, or roughly 0.9 PHs. Just about right for the business I'm in and the women I like.
But, given the choice, I'd rather be a bantam rooster than two big old hens.
Done any interesting electronics lately?
John
If you knew anything about farming you'd know that bantams are all show and no meat.
My grandfather's technique for choosing chickens for dinner was to grab them by the head and spin body until head was essentially separated (*), then sit them on the ground where they ran around in circles until they bled out. It always puzzled me how they managed to stay vertically oriented... I guess their equivalent of our inner ear isn't in their head ;-)
(*) That's what we need to do to liberals ;-)
Much more than you have :-D
...Jim Thompson
I love women, in all sorts of ways. All my best friends and all of my business partners have been women. All of my wives, daughters, and sisters, come to think of it.
But if critters peck like hens and cluck like hens, they're probably hens.
Stewer.
John
I know for a fact the B36 and 52 were tube models.
Later when the 52 got cruse missiles - anything goes. It had to. I trained the designers of the F-111 and prior to it, they made B52's. I took them from R/C/Tubes to Solid state and digital. Op amp as well.
Bikini wasn't the first bomb and Electronics was in tubes then. Computers were tube as well.
Mart> >
No one would see any difference, till they dropped dead.
You're babbling again. I made no negative comments about women, and I have no ends other than to share knowledge and amuse myself.
I do think that barnyard roosters and hens are both silly animals, but that you and JT act more like hens.
Now who is debasing women?
No, I just had breakfast with my beautiful, smart, skinny wife. Now I'm thinking about electronics [1]. You should try it some time, and take your mind off gossiping and clucking and various fantasies about other peoples' personal lives.
John
[1] I'm trying to design a 16-bit, 500 KHz ADC with a really good PGA front-end, 15 volts of 120 dB CMRR, ranges from 20 mV to 12 volts, low noise and drift. Nobody makes 16-bit SAR ADCs with PGAs, and no commercial PGAs can do what I need. So it will have to be made from parts... not too many parts, since I need 16 channels on a VME board.Or maybe I'll just pick blackberries and make a batch of bread pudding.
So, John L, post one of your wondrous circuits. Of course it will be subject to my ridicule ;-) So happy to note that I can now aggravate Larkin just as easily as Slowman ;-) Larkin's first sign of senility is persistently trying to be an asshole when he is realy nothing more than an amateur.
His second sign of senility is touting his company's wonderful circuit designs as his own, while posting amateur crap on S.E.D
The third sign is acting like Polly Prissypants :-)
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