Doepfer A-188-1C Handleiding

Doepfer Niet gecategoriseerd A-188-1C

Lees hieronder de 📖 handleiding in het Nederlandse voor Doepfer A-188-1C (30 pagina's) in de categorie Niet gecategoriseerd. Deze handleiding was nuttig voor 40 personen en werd door 2 gebruikers gemiddeld met 4.5 sterren beoordeeld

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DOEPFER

DOEPFERDOEPFER

DOEPFER System A-100 BBD Module A-188-1

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.

DOEPFER

DOEPFERDOEPFER

DOEPFER System A-100 BBD Module A-188-1

2. Basic Principles

As mentioned in the introduction a BBD circuit can be

regarded 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. From this also the name Bucket

Brigade Device is derived as each stage of the BBD can

be treated as a bucket. At each clock pulse the content of

each bucket is forwarded to the next bucket in the chain

and the current bucket is filled with the contents of the

preceeding bucket.

Fig.2: Bucket Brigade

Remark: In reality two "buckets" are required for each

stage as the content of a bucket has to be stored

temporarily in a "slave bucket" before it can be filled with

the contents of the preceeding bucket, in contrast to a

"real" bucket brigade not the buckets are passed on but

only the contents.

In the BBD the water is replaced by analog voltages

which again represent audio signals. The first bucket (1)

is the audio input, the last bucket (n) is the output of the

BBD. As in reality there are losses while the water (resp.

voltage) is passed on, because some drops of water go

wrong and at the end of the chain not the same amount of

water (resp. not exactly the same voltage) appears. In a

BBD the buckets are replaced by capacitors and analog

switches. As the capacitors of a BBD are very small

(some pF only) even the time required to pass on the

input to the output is crucial as the capacitors loose their

charges if it takes too long. This is why a minimum clock

frequency is specified for each BBC circuit. Below this

frequency the flawless operation of a BBD is not

guaranteed. In the A-188-1 intentionally frequencies can

be used that go below this value to obtain special "dirty"

and "crunchy" effects.

BBD circuits are available (or rather have been available)

with different number of stages. Usual numbers are 128,

256, 512, 1024, 2048 or 4096 stages. Currently (as of

spring 2006) only devices with 1024 and 2048 are still in

production. Other BBDs are obsolete, hard to find and

very expensive. Therefore only the versions of the A-188-

1 with 1024 and 2048 stages are standard products. All

other versions of the A-188-1 are available only while

stocks of the corresponding BBD circuits last.

The number of stages defines the delay time that

corresponds to a certain clock frequency. The higher the

number of stages, the longer is the delay. The higher the

clock frequency, the shorter is the delay.

Example: At 100kHz clock frequency the delay time is

10.24 ms for a BBD with 1024 stages and 20.48 ms for a

BBD with 2048 stages.

Product specificaties

Merk:	Doepfer
Categorie:	Niet gecategoriseerd
Model:	A-188-1C

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