[sdiy] Help with Timing Capacitor types.

[Paul Schreiber]

> Ah, that old, old, servo loop approach.
>
> As I showed a couple of years ago, there is a much simpler way. This is to add 
> a bit of dc offset at the base of the converter transistor.  Just takes a 
> trimpot and a resistor.   This gives an adjustment that may be used to 
> eliminate all linear temperature drifts, i.e., the correction is adjustable. 
> The old, old, servo loop method makes a fixed compensation and requires an 
> opamp and several resistors.

a) trimpot.....eck! :)

b) I use 2 resistors and 2 diodes...not to bad. It uses an op amp that is 
"already there".

Paul S.