> Hi Dirk
>
> > http://www.oldcrows.net/~jhaible/tonline_stuff/hj_wasp.jpg
> As far as I know the schmatics of Juergen Haibles wasp filter differs
> from the one Doepfer is using.
>
> Florian

Right. The A-124 is based on the original Wasp circuit/schematics of
Electronic Dream Plant/EDP (2xCA3080+CD4069). But we used another type of
logarithmic current source for the CA3080 control current and replaced the
separate HL and LP outputs by a single mix output with an additional mix
control (HP/LP share) to obtain a notch filter in its center position.

I'm not sure if it is idential to Juergen Haible's circuit but I don't think
so.

Best wishes
Dieter Doepfer