[sdiy] ARP VCO PNP-NPN exponential pair matching

[Paul Schreiber]

> The THAT 340P  may work fine for this application but I'm not going to
> be able to squeeze a 14pin dip package into the space of 2
> transistors, well at least not with extreme difficulty :-)  so I think
> I'll prefer to go with discrete transistors if at all possible.
> 

Then use a BC550/BC560 pair, cheap, high gain, better than ARP ever had :)

Paul S.