Doepfer

Totally impressive work Guy!
Looks really neat! And so in style ;-)

And wait did Dieter say SLOPE GENERATORS? and also in module form??!?!
Totally into that. Recently worked with the Serge slope generators and I
loved it.


Ernst






On Wed, Jun 30, 2010 at 4:32 PM, <yahoo@doepfer.de> wrote:

>
>
> Again: my comments are written inline.
>
> Dieter
>
>
> > That was the plan, yes.
> > The VCA Am inputs will be easy. For the Lin FM I'd probably have to try a
> bit harder.
>
> The serial resistor for the linear FM input is 100k (R11 leading from the
> VCO lin FM input to the summing node for the linear FM). If you add e.g.
> another 100k resistor the sensitivity is half as much as before.
>
>
> > > > not very happy with the way the Slew Limiter works.
> > > I'm surprised to hear that. The slew limiter works like all slew
> limiters,
> > > nothing but a capacitor buffered by an operational amplifier that is
> charged
> > > via a variable resistor (potentiometer with logarithmic scale in the
> range
> > > 1M...5M recommended). It's exactly the same curcuit as for the upper
> unit of
> > > the A-170.
> >
> > I used a 1M Audio. Might try a higher value...
>
> You may even increase the value of the slew capacitor which is only 220nF
> (C21 on the top right edge of the pcb). You may solder e.g. a electrolytic
> capacitor (1u...10u) in parallel to C21 to increase the max. slew time. The
> right pin of C21 is GND (i.e. the minus pole for an electrolytic capacitor)
>
>
> > All the classics then... :-)
> > I'd prefer more wave-shaping/multiplying over an additional
> > oh-no-not-again! LP filter.
> > And extended VCLFO, preferably with PW/M, would be very cool, yes.
> > Some easy little stuff like Boolean logic, comparators & Schmitt
> > Triggers would be welcome too.
> > Or replace 70% of all of the above with one VC Slope generator :-)
>
> Yes, we are working on a VC slope generator too (even as an A-100 module).
> Maybe we could add it to the expansion board.
>
>  
>


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