Doepfer A-188-1 BBD Module - Manual (Page 10)

DOEPFER DOEPFER DOEPFER DOEPFER System A-100 BBD Module A-188-1
10
4.2. BBD Section
" Ext. Clk In: BBD clock input
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 suitable clock frequencies
depend upon the BBD used in the module (pls. refer to the
table on page 3). The required level for the clock signal is
0/+5V (levels up to +12V cause no problems). This socket
can be used e.g. to synchronize two A-188-1 modules (i.e.
using one HSVCO for both modules).
§ a/b Audio In: audio input
3 Level: audio input attenuator
Sockets §a and §b are the audio input with the assigned
attenuator 3. The two sockets are internally connected
(miniature multiple). The second socket can be used to
forward the audio input signal to other modules (e.g. to a
VCA or VC polarizer or VC mixer for voltage controlled
mixing functions). Feed the audio signal that has to be
processed with the BBD effect into socket §a or §b.
Adjust the Level control 3 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 3 but the distortion
behaviour depends also upon the BBD circuit used in the
module.
) BBD Out: BBD output
Socket ) is the "raw" BBD output (i.e. not mixed, not
filtered). Pay attention that it is affected by polarity switch
8
).
Remark: The front panel markings of the first two
productions series are wrong concerning the BBD Output
and the feedback polarity switch. Please refer to the scheme
on page 4.
The BBD output can be used e.g. for voltage controlled
mixing functions (i.e. if the original signal and the BBD
signal are mixed externally with VCAs or VC polarizers or a
VC mixer).
$ Mix Out: mixed output
5 Mix: mix control (original/BBD)
9 Polarity: mix polarity
This group of elements is responsible for the mixed output
appearing at socket $ Mix Out. In the left/ccw position of
knob 5 Mix the original signal appears at socket $. In the
right/cw position of knob 5 the pure BBD signal appears at
socket $. In the intermediate positions of knob 5 a mix of
these two signals appear at the output socket. For a
standard flanger effect e.g. the center position is used.