Radio scan controller?

[Arthur Harrison]

One problem with varicaps is that the signal voltage,
as well as the control voltage, modulates their capacitance.
Also, standard varicaps have a low capacitance, generally in the
picofarad range. Also, the ratio of capacitance
is generally limited to less than 3:1, and that is with a very
large difference in control voltage.  Their are some exotic types which
exhibit larger capacitances (around 500pF) and ratios (15:1).
These devices do not have a linear relationship of capacitance to
reverse voltage.

-Art

-----Original Message-----
From: Plinio Andres Barraza <pab210 at is8.nyu.edu>
To: terry michaels <104065.2340 at compuserve.com>
Cc: Chris (the Hex) <the_hex at relay-1.ziplink.net>; synth
<synth-diy at mailhost.bpa.nl>
Date: Thursday, November 05, 1998 6:57 AM
Subject: Re: Radio scan controller?


>
>
>Terri:
>
>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?  It seems to me
>that this would be an interesting way to give V controll to oscillators
>or filters.  Is this the case?
>
>Plinio
>
>