Doepfer A-188-2 Manual

Doepfer Ikke kategoriseret A-188-2

Læs gratis den danske manual til Doepfer A-188-2 (16 sider) i kategorien Ikke kategoriseret. Denne vejledning er vurderet som hjælpsom af 10 personer og har en gennemsnitlig bedømmelse på 4.0 stjerner ud af 5.5 anmeldelser. Har du et spørgsmål om Doepfer A-188-2, eller vil du spørge andre brugere om produktet?

Download PDF

Side 1/16

DOEPFER

DOEPFERDOEPFER

System A-100 BBD Module A-188-2

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

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.

DOEPFER

DOEPFERDOEPFER

System A-100 BBD Module A-188-2

2. Basic Principles

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-188-2 intentionally frequencies can

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

and "crunchy" effects.

Standard BBD circuits as described above are available

(or rather have been available) with different numbers of

stages. Usual numbers are 128, 256, 512, 1024, 2048 or

4096 stages. In the A-188-2 a very special BBD circuit

with 3328 stages is used (MN3011) that is equipped with

additional outputs (taps) at the stages 396, 662, 1194,

1726 and 2790.

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.

Produkt Specifikationer

Mærke:	Doepfer
Kategori:	Ikke kategoriseret
Model:	A-188-2

Har du brug for hjælp?

Hvis du har brug for hjælp til Doepfer A-188-2 stil et spørgsmål nedenfor, og andre brugere vil svare dig

Dit navn*

Din email*

Skriv dit spørgsmål her

Ikke kategoriseret Doepfer Manualer

Doepfer A-100 Manual

1 September 2024

Doepfer Dark Link Manual

21 August 2024

Doepfer A-196 Manual

20 August 2024

Doepfer A-134 Manual

20 August 2024

Doepfer A-135-2v Manual

19 August 2024

Doepfer A-145 Manual

19 August 2024

Doepfer A-101-2 Manual

19 August 2024

Doepfer A-99 Manual

19 August 2024

Doepfer A-103 Manual

19 August 2024

Doepfer A-165 Manual

18 August 2024

Ikke kategoriseret Manualer

Nyeste Ikke kategoriseret Manualer

ORNO OR-ZL-1678 Manual

15 Juni 2025

LiftMaster 041-0405-000 Manual

15 Juni 2025

CDN TMW1 Manual

15 Juni 2025

Bradley S19-500 Manual

15 Juni 2025

Vestil FE-4-72 Manual

15 Juni 2025

Powr-Flite PFX1080 Manual

15 Juni 2025

Hughes & Kettner BassKick 707 Manual

15 Juni 2025

Marshall VSC-100 Manual

15 Juni 2025

Xiaomi Smart Electric Toothbrush T501 Manual

15 Juni 2025

Scarlett SC-SM10S53 Manual

15 Juni 2025