Doepfer

Schematic of wasp filter.
http://www.oldcrows.net/~jhaible/tonline_stuff/hj_wasp.jpg

Hello,

How about changing the clipping diodes in the resonance path.

If you change one to a led or silicium you should get asymetric clipping.

Has anyone tried that?

Best Dirk.

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

> How about changing the clipping diodes in the resonance path.
> If you change one to a led or silicium you should get asymetric clipping.
>
> Has anyone tried that?
>
> Best Dirk.

We did a similar trick in the A-106-1 and replaced each clipping diode by a
potentiomer + diode (connected in series). This allows to adjust both the
positive and negative clipping level (CL+ and CL- controls of the A-106-1).
By using the universal vactrol module A-101-9 both parameters can be voltage
controlled (potentiometer + vactrol output connected in parallel).

The corresponding diodes are labelled D3/D4 in the original Wasp schematics
of Electronic Dream Plant (EDP) and D1/D2 in the A-124.

Best wishes
Dieter Doepfer

b.t.w. We added a mod to the A-100 DIY page that allows self-oscillation for
the A-124.

> 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