NPN Transistor Question

My followup doesn't seem to have made it.

You're right about the 46 GHz--I was confusing it with another part, thanks.

The 13V I was quoting is BV_CES, which is pretty good for a part that fast. It shouldn't be too hard to arrange the circuit so that the base drive is really low-Z at DC.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs 
Principal Consultant 
ElectroOptical Innovations LLC 
Optics, Electro-optics, Photonics, Analog Electronics 

160 North State Road #203 
Briarcliff Manor NY 10510 

hobbs at electrooptical dot net 
http://electrooptical.net

Yep, I double-checked, that was 1952.

--
 Thanks, 
    - Win

While I was still in high school my father became a Raytheon wholesaler. I first saw that little blue blob ~1955 and it caused me to switch my education aims from architecture to electronics.

Previously, though raised in a radio & TV repair shop, and I built several toob amplifiers, toobs as a point of study turned me off. ...Jim Thompson

--
| James E.Thompson                                 |    mens     | 
| Analog Innovations                               |     et      | 
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    | 
| San Tan Valley, AZ 85142     Skype: skypeanalog  |             | 
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  | 
| E-mail Icon at http://www.analog-innovations.com |    1962     | 
              
I love to cook with wine.     Sometimes I even put it in the food.

Beta is 12 typ, no Ft specified.

My first job interview, I told the guy that I preferred tubes to transistors, because transistors were too easy to blow up. He said "that won't do" and ended the interview.

Next guy, I said the same thing. He laughed and hired me, and I designed about $200e6 worth of stuff for him. He also told me that some day a transistor inside an IC would cost ONE CENT. I thought he was crazy.

--

John Larkin         Highland Technology, Inc 
picosecond timing   precision measurement  

jlarkin att highlandtechnology dott com 
http://www.highlandtechnology.com

If "readily available" means "I can buy one retail any sunday afternnon" the 2N2222A is about as good as all the others, Ft 300MHz.

--
umop apisdn

Ahhh... flower power instead of sand power.

I remember when the price went down to around $12 each,i bought one for experimentation.

1947? are you nuts? Old re-hashed stuff. Julius Edgar Lilienfeld was awarded patent 1,745,175 on Jan28, 1930 for a transistor that he invented and reduced to a repeatable practice. This is not his only patent in the field; try 1,877,140 granted Sep 13, 1932 and 1,900,010 granted Mar 7, 1933. NPPN, PNNP and varicaps as well. He clearly knew what he was doing.

Gotta wait until Oct 3, 1950 before another group of 3 patents (same day, same title)...

On Wed, 10 Jun 2015 02:24:22 -0700, Robert Baer Gave us:

Get off your high horse, chump.

There's the classic QST article in the mid-fifties, an introduction to transistors. And it comes right out and says "they can't amount to much, if nothing else, they don't work at high frequencies".

I'm paraphrasing, but I heard about the article long before I read it. And it really did say something along those lines.

I'm finding it quite amazing now to read about multiband transistor portables that were out in the late fifties, I assumed that sort of thing didn't arrive till the sixties. A lot of those early transistor shortwave radios were junk, but there was the National HRO-500 in 1964 that's considered an expensive classic.

Michael

Oh, and ignore the 20 YEARS EARLIER patentS?

• AS i vaguely remember, the bandwidth-extending trick (borrowed from tube circuits) of neutralization was used.

[snip] [snip]

Yep. In the late '50's I had an AM radio that used CK760's in the IF. The IF transformers had an extra winding feeding back thru a capacitor to the transistor base to "neutralize". ...Jim Thompson

--
| James E.Thompson                                 |    mens     | 
| Analog Innovations                               |     et      | 
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    | 
| San Tan Valley, AZ 85142     Skype: skypeanalog  |             | 
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  | 
| E-mail Icon at http://www.analog-innovations.com |    1962     | 
              
I love to cook with wine.     Sometimes I even put it in the food.

On Thu, 11 Jun 2015 06:46:07 -0700, Jim Thompson Gave us:

I had a "Wilco" that fit in the palm of your hand. (mine too).