Doepfer A-147 User Manual
doepfer
CV
Reset
CV
A-147
VCLFO
Frequ.
System A - 100
1. Introduction
Module A-147 (VCLFO) is a voltage controlled low
frequency oscillator,
trol voltages over a 0.01Hz to 50Hz frequency range.
The VCLFO can be patched as a modulation source
for a wide range of modules (for instance, modulation
of VCO pulse-width or frequency, VCF cut-off frequency, VCA amplitude modulation) and as a provider
of repetitive or clock voltages (for instance to drive the
A-161 clock sequencer).
Four waveforms are available: triangle, sine, square,
and falling sawtooth waves.
The VCLFO's frequency can be controlled by hand,
but also by voltage control.
You can sync the VCLFO to another waveform by
connecting the other waveform (eg another LFO) to
the VCLFO’s reset input.
VCLFO A-147
which can produce cyclical con-
1
A-147
VCLFO
System A - 100
doepfer
2. Overview
➊
➋
➌
➍
➎
➏
A-147
Voltage Controlled LFO
Reset
CV
0
0
VCLFO
Frequ.
10
CV
10
➀
➁
➂
➃
➄
Controls and indicators:
Frequ. : Manual frequency control
1
2 CV : Attenuator for the voltage at input "
: Frequency indicator for the triangle
LED
3
and sine waves at outputs § and/or
$
: Frequency indicator for the square
LED
4
5
wave at output
: Frequency indicator for the sawtooth
LED
wave at output
%
&
In- / Outputs:
!
CV : Control voltage input
"
§ : Triangle wave output socket
$ : Sine wave output socket
% : Square wave output socket
& : Sawtooth wave output socket
: Reset input for syncing the VCLFO
Reset
2
doepfer
System A - 100
VCLFO A-147
3. Controls and indicators
1 Frequ.
This control sets the frequency of the VCLFO in a
range from 0.01 Hz (one cycle every 100 seconds) to
50 Hz (50 cycles a second).
H The actual LFO frequency is determined by a
combination of manual control and any voltage patched into CV input " .
2 CV
Use Attenuator 2 to set the level of the voltage at CV
input " affecting the VCLFO frequency.
3 LED ... 5 LED
LEDs 3 to 5 indicate the frequency and voltage state
of the LFO signals at their respective outputs.
H If the LFO frequency is higher than about 15
to 20 Hz, our persistence of vision means
that the LEDs look permanently on.
4. In- / Outputs
! Reset
A gate pulse entering the
les the VCLFO to be synchronised with another
oscillator.
This means that the waveforms instantly go to their
zero-point, and start from there (see Fig. 1). In the
case of the triangle and sine waves, that’s 0 V; with
the square wave it’s about +5 V and the sawtooth it’s
at half its maximum (about +3.5 V).
reset input socket
" CV
Socket " is the
quency. The voltage at this input is added to whatever
voltage is set on the manual control 1. The level of CV
input " can be adjusted with the Attenuator 2.
voltage control input
§
This socket outputs a triangle wave, whose frequency
is indicated by LED 3 (amplitude roughly ± 5 V).
! enab-
for LFO fre-
3
Loading...