Doepfer A-146 User Manual
doepfer
LFO 2
Frequ.
System A - 100
1. Introduction
Module A-146 (LFO 2) is a Low Frequency Oscilla-
, which produces periodic control voltages over a
tor
wide range of frequencies.
The LFO can be used as a modulation source for a
series of modules (for instance pulse width and/or
frequency modulation of a VCO, modulation of a VCF
cut-off frequency, amplitude modulation with a VCA).
LFO 2 A-146
Frequ.
Range
Wave
Form
Three outputs are available, with different waveforms:
sawtooth / triangle; square wave, and positivevoltage square wave.
The waveform is continuously adjustable from rising
sawtooth, through triangle to falling sawtooth. The
same control affects the
wave.
A three-way switch can select one of three frequency
ranges, spanning from one cycle every few minutes, at
the lowest, up to audio frequency at the highest.
pulse width
of the square
1
A-146
LFO 2
System A - 100
doepfer
2. Overview
➊
➋
➌
LFO 2
Variable Waveform LFO
Frequ.
10
0
Frequ.
M
Range
Wave
Form
L
H
➀
➁
➂
➃
➄
Controls and indicators:
Frequ. : frequency control
1
Frequ. Range : switch for selecting frequency range
2
3 Waveform : control for adjusting the waveform or
pulse width
LED : square wave frequency indicator
4
5 LED : sawtooth / triangle wave frequency
indicator
In / Outputs:
!
"
§
: output for normal square wave
: output for positive square wave
: output for sawtooth / triangle wave
2
doepfer
System A - 100
LFO 2 A-146
3. Controls and indicators
1 Frequ.
Use this control to set the LFO’s frequency, within the
range set by 4.
2 Frequ. Range
Use frequency range switch 4 to select a suitable
range from the three available :
(low): up to several minutes per cycle
• L
• M (medium): normal LFO range
• H (high): audio range
3 Waveform
The waveform of the signal at output § can be continuously varied with this control, from rising sawtooth
(fully left) through triangle (centre position) to falling
sawtooth
pulse width of the rectangle wave at outputs ! and ".
4 LED • 5 LED
LEDs 4 and 5 indicate the frequency rate of the
waveforms at outputs ! to §.
(fully right). The same control alters the
H
If the LFO frequency goes above about 15 to
20 Hz, our persistence of vision means that
the LEDs look permanently on.
4. In / Outputs
!
This socket is the output for the normal (positive /
negative amplitude - ± 2.5 V)
frequency is displayed by LED 4.
square wave
"
This socket is the output for the positive square wave
(amplitude + 5 V), whose frequency is displayed by
LED 4.
§
This output, depending on the setting of control 3,
sends out a rising sawtooth, triangle or falling sawtooth
waveform (amplitude ± 2.5 V) whose frequency is
indicated by LED 5.
, whose
3
Loading...