Doepfer Dark Energy I (device no longer available) - Manual (Page 13)

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Dark EnerGy DOEPFER Functionality
• PWM Source switch
This switch chooses the source of the square wave‘s pulswidth modulation. The switch toggles between
LFO2, envelope (ADSR) and no source (off). The ADSR generates an „one shot“ pulswidth modulation,
LFO2 forms a periodic and continous modulation. Low LFO2 frequency settings will result in „wide“ and
„lush“ textures which are very useful for huge pad sounds. If LFO2 runs in the audiorange (high), the VCO
generates noisy textures that will differ sonically from FM-effects.
• Waveform switch (saw / off / triangle)
Next to the squarewave, the VCO generates a triangle- and sawwave. The sum of the squarewave sig-
nal and the waveform, selected with the waveform switch, is fed into the input of the filter. To disable the
squarewave, move the PW-knob in fully clockwise or fully counterclockwise position and shut off PWM by
turning the PWM knob into fully counterclockwise position. Now, only the saw- or triangle wave is audible,
depending on the setting of the waveform switch.
To disable the VCO completely, set the waveform switch into off-position, the PW knob into fully clockwise
or counterclockwise position and the PWM knob into fully counterclockwise position. Use this setting, if you
e.g. want to feed an external audiosignal into the filter of Dark Energy.
• VCO F Input
Usually, the VCOs internal pitch CV input is connected to the output CV1 of the built in MIDI/USB interface.
This VCO-input uses the standard 1Volt/Octave scaling which is commen for most of all analogue synthesi-
zers. This enables you to play Dark Energy just like any other keyboard instrument with temperated tuning
resp. in half tone steps. You do not have to scale or tune anything.
In case you want to use Dark Enery without MIDI, but connected to a CV/Gate sequencer or a Doepfer
A-100 modular synthesizer, you will make use of Dark Energy‘s CV-inputs. The VCO F socket provides an
external CV-input for the VCO frequency (tuning). As soon as you plug in a cable, the VCOs pitch is cont-
rolled via this input.
Please note that this socket is not normalised. This means that the connection between the MIDI/USB
interface and the VCO is not disabled when a cable is plugged in. The external CV is added to the value,
provided by the MIDI/USB interface. This is very useful to e.g. transpose a sequence, which is played by an
A-155 stepsequencer, with the help of a MIDI/USB keyboard in realtime.
Instead a CV/Gate sequencer or a keyboard, you may also use any other suitable CV or even audiosignals
as modulation source.
• VCO PW Input
If you wish to control the pulswidth of the squarewave signal with an external CV, use this input socket. A
change of 5 Volts covers the entire modulationrange.
If an external control voltage might not fit to the specifications of the Dark Energy‘s CV inputs (VCO F,
VCO PW, VCF F, VCA A, ext. Audio), resp. it is too high or too low, please use an external attenuator (e.g.
Doepfer A-183-1) or amplifier (e.g. Doepfer A-183-3). These additional modules can easily be housed in a
Doepfer A-100 Minicase.