[sdiy] Using analog for physical modeling

[Brock Russell]

At 02:14 AM 21/09/2011, Tom Wiltshire wrote:
>Isn't that what the Princeton PT2399 is trying to be? - except that 
>it won't go short enough to do flanging, and only just for chorus. 
>PIty, that. So close, but no banana. They should have added a VCO 
>modulation input too, to save the craziness people do to modulate 
>it. Still, it's about the best modern option, and very much the 
>successor to the original BBDs.
If you want the PT2399 to do flanging, run two in parallel. 
Modulation requires changing the frequency set current sink resistor 
with a variable current sink which requires the addition of a 
transistor in the most primitive implementation. The real pity of the 
PT2399 is that they did not provide for external clocking which would 
enable much easier cascading and syncing of multiple devices. I agree 
that it is the best modern option to BBDs when you consider bang for 
the buck and ease of implementation.

Brock