Doepfer A-101-1v Manual

Doepfer Ikke kategoriseret A-101-1v

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Side 1/6

doepfer System A - 100 Vactrol Multitype Filter A-101-1

1. Introduction Module A-101-1 is a special multitype filter based on

an idea by Nyle A. Steiner from the year 1974. Injecting

an audio signal into different points of a standard low

pass filter circuit leads to the three filter types low pass

(LP), band pass (BP) amd high pass (HP). For each

filter type a separate input is available and the sum of

the three filtered signals appears at the common out-

put. Even a notch filter can be realized.

In contrast to the original circuit so-called vactrols are

used instead of diodes as variable resistors for fre-

quency and resonance control. A vactrol is a combi-

nation of a light depending resistor (LDR) and a light

emitting diode (LED) both put into a small light-proof

case. Vactrol based circuits are known for their soft

low-distortion sound. For details about vactrols and

the A-101-1 circuit principles please use the correspon-

ding links in the A-101-1 info page on our web site

www.doepfer.com.

The three filter audio inputs are normalled via swit-

ching sockets, i.e. the BP input is connected to the LP

jack socket provided that no cable is plugged into the BP

socket (same applies for HP/BP inputs). Each audio

input is equipped with an attenuator. The audio inputs

are very sensitive and enable distorted sounds too.

For both frequency and resonance manual control and

several control voltage inputs are available.

Two LEDs display the current frequency and reso-

nance settings.

A-101-1 Vactrol Multitype Filter System A - 100 doepfer

Controls:

1 Frequency manual frequency control

2 CVF2 attenuator for FCV input "

3 CVF3 attenuator for FCV input §

4 Emphasis manual resonance control

5 CVQ2 attenuator for QCV input %

6 LP attenuator for LP audio input &

7 BP attenuator for BP audio input /

8 HP attenuator for HP audio input (

9a/b LED controls for frequency and resoance

Inputs / Outputs:

! CVF In 1 frequency control voltage input 1

" CVF In 2 frequency control voltage input 2

§ CVF In 3 frequency control voltage input 3

$ CVQ In 1 resonance control voltage input 1

% CVQ In 2 resonance control voltage input 2

& LP In low pass audio input

/ BP In band pass audio input

( HP In high pass audio input

)a Out 1 audio output 1

)b Out 2 audio output 2

2. Overview

(

Produkt Specifikationer

Mærke:	Doepfer
Kategori:	Ikke kategoriseret
Model:	A-101-1v

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