Doepfer

Can anyone tell me if there are plans to give the Dark Time
the facility to retrigger the LFOs on the Dark Energy?

Will there be information available above the technicalities of this?

I'm not looking to get a Dark Time though.
My idea is to modify a DE so that the LFOs can be retriggered.
Either by the gate, or by the triangle wave output of the main oscillator.
I'm considering that an analog switch chip would be suitable to short
the jumper pins that are provided for this reset.
I'd put an additional socket on the DE for a re-trig input (or
rather it would just be a switch for the LFO unless I used a
more complex circuit)

Any suggestions as to which switch chip to use ( I figured an NC switch)
and whether it's possible to power to chip from some onboard voltage
from the DE.

Any other DE modders around?

thanks
andy butler

> Can anyone tell me if there are plans to give the Dark Time
> the facility to retrigger the LFOs on the Dark Energy?
>
> Will there be information available above the technicalities of this?
>
> I'm not looking to get a Dark Time though.
> My idea is to modify a DE so that the LFOs can be retriggered.
> Either by the gate, or by the triangle wave output of the main oscillator.
> I'm considering that an analog switch chip would be suitable to short
> the jumper pins that are provided for this reset.
> I'd put an additional socket on the DE for a re-trig input (or
> rather it would just be a switch for the LFO unless I used a
> more complex circuit)
>
> Any suggestions as to which switch chip to use ( I figured an NC switch)
> and whether it's possible to power to chip from some onboard voltage
> from the DE.
>
> Any other DE modders around?
>
> thanks
> andy butler

There are no plans for a LFO reset feature. The reset circuit would be
larger than the LFO circuit itself (which is nothing but two opamps). It's
not only an electronic switch that shortens the capacitor of the LFO. You
also have to make sure that the LFO starts after the capacitor discharge
alwas into the same direction (usually rising slope of the triangle).
Otherwise the LFO starts randomly after the discharge.

Best wishes
Dieter Doepfer

yahoo@doepfer.de wrote:

> There are no plans for a LFO reset feature. The reset circuit would be
> larger than the LFO circuit itself (which is nothing but two opamps). It's
> not only an electronic switch that shortens the capacitor of the LFO. You
> also have to make sure that the LFO starts after the capacitor discharge
> alwas into the same direction (usually rising slope of the triangle).
> Otherwise the LFO starts randomly after the discharge.
> 
> Best wishes
> Dieter Doepfer

Thanks replying Dieter, I really appreciate that you take the time.

I'd thought that the 'phase' of the lfo would be defined
by the capacitor that was being shorted.
So knowing this is not the case saves me from embarking on aa doomed project.

best regards

andy butler

> I'd thought that the 'phase' of the lfo would be defined
> by the capacitor that was being shorted.
> So knowing this is not the case saves me from embarking on aa
> doomed project.

When the capacitor is discharged the LFO may start with the positive or
negative slope. It depends upon the situation when the electronic discharge
switch closes. As far as I remember the LFO starts from zero to the positive
if the triangle was in the rising slope (independend of the actual positive
or negative value) when the capacitor is discharged by the switch (and vice
versa). But I'm not 100% sure and have to take a look at the schematics. It
has to do with the Schmitt Trigger state of the circuit when the capacitor
is shortened. The state of Schmitt Trigger defines if the LFO starts with
rising or falling slope.

Best wishes
Dieter Doepfer