"Jim Lesurf" wrote in message

In article
, Arny
Krueger
wrote:
"Jim Lesurf" wrote in message

In article
, Arny
Krueger wrote:


I think the lesson is that economies of scale can be
quite impressive. The development, tooling and sales
costs don't increase that much when the sales double.

Tell me about it! I'm trying to find a UK supplier who
will sell small quantities of items like Toko-type
low-pass filters! Countless similar filters are in all
kinds of tuners, etc.

Must be legacy technology. The FM tuner in my Sansa
Clip+ can't have many coils, given that they fit the FM
stereo tuner (biggest weakness - no dedicated antenna
terminals), a computer (with DSP), EPROM (firmware), two
banks of gigabytes of RAM, headphone amps, jacks, color
display, pushbuttons and a battery in less than a cubic
inch.

So how does it filter/suppress the 19kHz pilot tone and
the remains of the 38kHz DSBSC after stereo demodulation?

Good question. Obviously, it could be done with active filters. I direct you
to the data sheets for the relevant chips which are online. I'd study it
myself right now but I'm off to a gig this morning.