"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?

It appears that all audio signal processing is done in the digital domain:

http://read.pudn.com/downloads159/doc/710424/Si4706.pdf

Please see page 15 for listing of external components required (a bypass
cap on the power supply).