Desired Sinewave Generator IC

[Jon Kirwan]

Not so much 'consider', as encourage someone to whine that there's
no demand, and allow managers to be scared off.

If it were REALLY an issue of 'no demand', the first such
oscillator-in-a-chip would be gathering dust on the shelf.
There's no such oscillator, because it IS a difficult task
to make a true, pure sinewave with a mass-producible
hardware base. The old HP 200 audio generator got its
second feedback loop (the amplitude control) from an
incandescent lamp (a component akin to 'ballast tubes').
Newer designs use the voltage-controlled-resistance
region of a selected-part jFET. In each case, it isn't
"standard" engineering practice, but a clever trick that
saves the design.
<snip>

Another trick:
http://jlnlabs.online.fr/cnr/negosc.htm

Even Bob Noyce tried to patent it back in 1961 or 1962, I think.

Jon

 

[Jon Kirwan]

Hmm, looking at the I-V curve given here, this guy
is putting 2000 to 10000 mA through a 2N2222A to
get his negative resistance. He must know
something I don't know... I'm sure that would give
my 2N2222A a negative *existence* !!!

Um, did you look at his schematic? There is a 1k resistor with a 12V
supply and the statement of I=6mA. They use commas for radix points,
in much of Europe.

Yes, all the Europeans who do that should just cave in and come on
over to the USA way of doing things which obviously makes a whole lot
more sense. But then, sometimes I just accept the fact that I
can't change people and go with the flow.

Jon