VCO temp compensation ideas

[Rene Schmitz]

At 16:54 24.10.1997 +0930, you wrote:
>Y-ellow Y'all.

>What's wrong with using the age old, tried and tested method of whacking in
>a thermistor and trimming it down? I know that people have said they don't
>like using thermistors because of cost but considering all these other
>methods seem at least twice as expensive, I'm just curious as to why no-one
>is using them?
>
I didn't say that there is a point against a tempco. Of course I 
have considered that if you add a trimpot you could precisely get 
the desired temperature compensation.
But the 3500ppm tempcos are hard to get. (At least in this part of the world.)
Ok, maybe the commonly available NTC resistors are an option, but these are
bulky and you still have to thermaly match them close to the expo. transistors.
(Of course you would have to replace the other resistor in the divider then
not the one thats usually the tempco)

The ordinary (read: cheap) PTCs are NO option, anyone who has seen a
datasheet about them knows what I mean...;-)

Cost doesn't really matter. I don't care about one dollar (or 1 deutschmark)
more or less.

And I have been using my VCOs without any compensation so far and have
been happy with it.

>Be absolutely ICebox.
You say it man! IC - not resistor ;-)

Greetings
  Rene