DOEPFER A-188-2 Manuel - Page 11

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CV Out:

CV output HSVCO

This CV output indicates the clock frequency at output

and is nothing but the sum of all CV inputs (manual, CV1

and CV2). The main purpose of this output is to control the

CV input of external low pass filters that can be used as

anti-aliasing filter and clock filter. If desired one low pass

filter can be used behind the audio output to suppress the

clock noise, especially when the clock frequency falls below

~15 khz. Another filter can be used at the audio input to

reduce the max. frequency of the incoming audio signal,

consequently reducing aliasing artefacts. As the CV output

reflects the clock frequency (affected by the manual control,

CV1 and CV2) the external filters automatically follow the

clock frequency of the BBD module. The higher the slope of

the external filter (e.g. 12/24/48 dB/octave) the better is the

clock suppression. But the CV output can be used for other

applications as well, e.g. controlling parameters of the

feedback loop like feedback amount/polarity (CV of a VCA

or VC polarizer used in the feedback loop), filter frequency

(CV of a VCF used in the feedback loop), phase shift (CV of

a VC phaser used in the feedback loop).

System A-100

4.2. BBD and Sub-Mixer Section

Ext. Clk In:

This is the clock input of the BBD section and is internally

connected to the clock output § of the HSVCO section (i.e.

it is normalled to the Clock Out socket §). If an external

clock source is used the clock output of this source is

patched to socket $. In this case the internal connection to

the HSVCO is interrupted. The clock frequency table can be

found on page 3. The required level for the clock signal is

about +3V (levels up to +12V cause no problems). This

socket can be used e.g. to synchronize two A-188-2

modules or an A-188-2 and A-188-1 (i.e. using one HSVCO

for both modules).

Audio In:

Level:

Sockets % is the audio input with the assigned attenuator 5.

Feed the audio signal that has to be processed by the A-

188-2 into socket %. Adjust the Level control 5 so that the

output signal does not distort - unless you want to obtain

distortion. For normal A-100 levels (e.g. VCO A-110)

distortion appears at about three o'clock position of control

BBD Module A-188-2

BBD clock input

audio input

audio input attenuator