Doepfer A-101-1v Handleiding

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

1

1. IntroductionModule 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 typea 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 vactrolsare

used instead of diodes as variable resistors for fre-

quency and resonance control. A vactrolis a combi-

nationof 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 resonancemanual control and

several control voltage inputs are available.

Two LEDs displaythe current frequency and reso-

nance settings.

Product specificaties