Doepfer A-163 Voltage Controlled Divider - Manual (Page 4)

A-163 VC Frequency Divider System A - 100 doepfer
4
4. In- / Outputs
! CV In
The external control voltage (e.g. from an LFO or
ADSR) used to modulate the divisor N is fed into the
CV input ! .
" In
Socket " is the audio input of the module. This input
is connected to the audio source (waveform preferable
rectangle from an VCO or LFO). The frequency of this
signal (= master frequency) is divided by N.
§ Out
Socket § is the output of the module. Here the sub-
harmonic (rectangle) is available.
Frequency division of control signals
The output § of the module is AC-coupled. This
means that no slow signals (e.g. 0.5 Hz LFO) can be
divided. To obtain a DC-coupled output the capacitor
C7 on the A-163 pc board has to be replaced by a
jumper (short circuit). This modification leads to a
0/+5V rectangle output that can be used for slowly
changing signals too. Please refer to the service ma-
nual for the position of C7.
5. User Examples
Sub-Oscillator
With the A-163 an audio sub-oscillator can be realized
very simply. The rectangle output of a VCO is connec-
ted to the audio input of the A-163. The audio outputs
of the VCO (e.g. sawtooth) and the A-163 are mixed
together e.g. with an A-138b. Thus one obtains a VCO
with sub-oscillator to enhance the bass sound of the
VCO. The interval between VCO and sub-oscillator
can be set manually or voltage controlled.
Subharmonic Glissando
One obtains very interesting effects if a dynamically
changing control voltage (e.g. from ADSR, LFO, Joy
Stick, Theremin, Random or similiar) is used to define
the divisor N of the A-163. This leads to a special kind
of glissandos containing only the subharmonics of the
master frequency.