Doepfer A-124 Manual

Doepfer Ikke kategoriseret A-124

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Side 1/8

doepfer System A - 100 Wasp Filter (VCF 5) A-124

1. Introduction

Module A-124 (WASP FILTER) is a special voltage-

controlled multimode filter with a cut-off slope of

-12dB / octave.

The special feature of the A-124 is the peculiar elec-

tronic circuitry of the Wasp synthesizer manufactured

at the end of the seventies by the UK company EDP

(Electronic Dream Plant). This synthesizer is well

known for its eye-catching black/yellow wasp design

and its distinctive filter. Its circuitry "abuses" digital

inverters as analog operational amplifiers leading to

distortions and other "dirty" effects that generate the

specific sound of this filter.

Our version is equipped with a band pass output and

a combined low/notch/high pass output. For this

latter output a control knob defines the relative

amounts of low and high pass signals. If both si-

gnals appear at the same level (i.e. middle position of

the Mix knob) one obtains a filter. Otherwise thenotch

low or high pass signal predominates.

Resonance can be adjusted manually. The filter can't

go into self oscillation, in contrast to most of the other

VCFs in the A-100 system.

The cut-off frequency can be adjusted manually, or

by voltage control. Two CV inputs are available.

Audio

CV 2

BP Out

LP/HP Out

Res.

CV 1

A-124

WASP FILTER

Frq.

Lev el

Mix

A-124 Wasp Filter (VCF 5) System A - 100 doepfer

2. VCF 5 - Overview Controls:

1 Audio Level : Input signal attenuator

2 Frq. : Cut-off frequency control

3 § CV 2 : Attenuator for filter CV

4 Res. : Resonance control

5 Mix : Control for relative amounts of low

and high pass signal

In / Outputs:

! Audio In : Audio input to the filter

" CV 1 : Cut-off frequency CV input

§ 3 CV 2 : ditto, level controlled by

$ BP Out : Band-pass filter output

% LP/HP Out : Mixed low-pass / high-pass filter out-

put

A-124

VCF 5

CV 1

CV 2

Audio In

Frq.

CV 2

Res.

Mix

Lev.

➊

➋

➌

➍

➎

➀

➁

➂

➃

➄

WASP FILTER

0 10

010

0 10

LP HP

LP/HP Out

BP Out

Produkt Specifikationer

Mærke:	Doepfer
Kategori:	Ikke kategoriseret
Model:	A-124

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