[sdiy] VCLFO core circuit..

[Ian Fritz]

Once again (sigh): matching is for thermal compensation.  It has nothing to 
do with log conformance, which is determined by the chatacterics of the 
logging transistor itself.

Ian


>That said I've done the npn-pnp expo with generic transistors 
>(3904/3906)and had acceptable results for things like VCF where expo
>conformity isn't too critical (at least to me)...
>
>If I wanted accuracy I'd either feel the (extreme) pain to match the 
>NPN-PNP, or use another topology...