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Fig. 1: A-188-2 Controls and In/Outputs

System A-100

1. Introduction

Module A-188-2 based on a so-called Bucket Brigade

Device (abbr. BBD). In contrast to the A-188-1 the A-188-

2 uses a tapped BBD circuit, i.e. the circuit has available

six different outputs at the BBD stages 396, 662, 1194,

1726, 2790 and 3328. Each of the taps is available as a

single output but the module features also two mixing

sub-units. For both mixers the levels and polarities of

each BBD output can be adjusted to obtain two different

mixtures. Each mixer has a wet/dry control that allows

choosing between the original signal, the BBD mix or

anything in between. The outputs can be treated as

stereo outputs but that's not . Due to the six taps even six

different feedback types are possible. The feedback input

socket is normalled to the "396" output. But by patching

the feedback socket to any of the single output sockets

another BBD tap can be used for positive or negative

feedback to obtain different sounds. Even external

feedback processing is possible. The A-188-2 uses a

high speed VCO to generate the BBD clock. The clock

and consequently the delay time can be controlled

manually and by the two control voltage inputs CV1 and

CV2. CV2 is equipped with a polarizer. The module has a

clock output available that is normalled to the clock input

socket. These sockets can be used to link different BBD

modules and to run them with the same clock. A voltage

composed of the manual delay control, CV1 and CV2 is

available at the CV out socket, e.g. to control an external

clock suppression filter as the A-188-2 is not equipped

with such a filter.

BBD Module A-188-2