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Good, people are still introducing jfets.


Good Gm, 15 cents, and "low noise", whatever they mean by that.


John Larkin         Highland Technology, Inc

lunatic fringe electronics  

Re: jfet
On Friday, May 19, 2017 at 2:45:33 PM UTC-4, John Larkin wrote:
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Huh, designed for AM/FM radio, how big is that market?  
George H.
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Re: jfet
George Herold wrote:

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** About 80 million units per year, one in each new car.  

....  Phil  

Re: jfet
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George H. "

There is another thing or two they can do that no other semiconductor will.

Re: jfet
On Fri, 19 May 2017, George Herold wrote:

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Anything for consumer equipment has the potential to be massive.

Lots of linear ICs have faded over the decades, especially communication  
type devices, but the ICs intended for consumer am/fm radios seem to have  
fairly long staying power.  Especially since they often aren't seen in  
hobby circles.

I suppose AM/FM radios are dwindling now, but certainly they've been a big  
thing in the past.  In the old days, car radios used to bring the antenna  
to the top of a tuned circuit, a very high impedance point.  But the car  
radios of more recent design that I've looked at used an "active antenna"  
type circuit, use an FET to provide a high impedance load to the whip  
antenna, and then transform it down to a lower impedance.  So that has to  
be common to most car radios, at least up to recent times.

It is changing, my Sansa Fuze MP3 player is about 7 years old, if not  
older, and it can't have a traditional radio inside, there's not enough  
room.  So I'm assuming an IC intended for the purpose of AM/FM radio, and  
probably turning to digital process somewhere along the line.  And it's a  
pretty good receiver.  And since portable shortwave receivers have been  
going that way for most of a decade now, I assume car radios and many a  
portable am/fm radio are going that way, a single IC for the purpose and  
not many external components.  Not sure they'd need jfets, but maybe they  
still need it for the "active antenna".


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