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

Yep, I double-checked, that was 1952.

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

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.

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

Ahhh... flower power instead of sand power.

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

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.

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

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).