Doepfer A-188-1 BBD Module - Manual

DOEPFER DOEPFER DOEPFER DOEPFER System A-100 BBD Module A-188-1
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Fig. 1: A-188-1 Controls and In/Outputs
1. Introduction
Module A-188-1 is a so-called Bucket Brigade Device
module (abbr. BBD). BBDs have been used to delay
audio signals before digital delays dethroned the BBD
based effect units. But BBDs have some very unique
advantages (or disadvantages dependent on the point of
view) over the digital counterpart which result from the
special properties of the BBDs. BBD circuits can be
treated as a chain of Sample&Hold units (S&H) which
pass on their voltages to the next S&H in the chain at
each clock pulse. A more detailed explanation – including
the different types of BBDs – can be found in the
following chapter.
In any case the sounds generated by module A-188-1 are
very special. Typical applications are: Flanger, Chorus,
Analog Delay or Karplus/Strong synthesis. But as the A-
188-1 has a lot of very unique features (voltage controlled
clock rate / delay time with extreme range, polarity
switches for the CV inputs, feedback and BBD out/mix,
clock and CV output of the high speed VCO, BBD clock
input, feedback insert, feedback up to self-oscillation) a
lot of unusual applications can be realized with the
module (e.g. delay controlled by ADSR, random,
envelope follower or sequencer with positive or negative
effect). The A-188-1 also has no built-in anti-aliasing filter
in order not to limit the possibilities of the module. For this
the CV out is intended.