Radio scan controller?

[Plinio Andres Barraza]

On Fri, 6 Nov 1998, Paul Perry wrote:

> At 09:07 AM 5/11/98 -0500, Plinio Andres Barraza  wrote:
> 
> >You mentioned varicap diodes in a recent message.  I happen to be very new
> >to electronics so I really know very little, but I was wondering, are
> >these varicap diodes useful for audio range applications? 
> 
> well one problem as mentioned before is the small values of the capacitance
> (typically 3pf to 20pf).
> And, they would never match or track, i suspect.
> Better to use a switched capacitor approach.
> 
> paul perry melbounre australia
> 
> 

I remember a while back a discussion about switched capacitors, someone
mentioned they were on the way to being digital.  Are switched capacitors 
devices that do the equivalent of laying down a series of capacitors of
different values and just switching between them?     

I really apreciate getting responses to all my naive questions
I feel like I could really learn something asking around.  If it gets
anoying please tell me.  

Plinio