Analogue Solutions Concussor - Manual (Page 24)

ANALOGUE SOLUTIONS
CONCUSSOR e&oe (c) 12-2007 24
VCO 6HP - Voltage Controller Oscillator
Introduction
VCO is a single VCO laid out in a similar way to the VCO sec tion you would find on a mono-
synth. The VCO can go down to low fre quen cies so they can be used as an LFO.
Voltage Controlled Oscillators (VCOs) in gen er al
The VCO or signal generator, commonly found on most music synthesizers consist of an
ex po nen tial amplifier, a resetable in te gra tor and waveshaping circuitry. ‘Voltage Controlled
Os cil la tor’ means an oscillator whose frequency can be controlled by an ex ter nal voltage.
A VCO is responisble for the pitch of a sound and its basic tim bre. Most VCOs will offer a
va ri ety of wave forms. Some VCOs offer the facility to alter the pulse width of a square wave
either manually or with a voltage (pulse width modulation).
Controls In Detail
Tune
The VCO has a wide ranging tune control. Turning Tune alters the basic pitch of the oscil-
lator.
Square Level
This sets the output volume of the square waveform output.
Sockets in Detail
CV in
This socket is the pitch CV control input and is used to control the pitch of the oscillator.
PWM
This is a pulse width control CV input. Use a -12 to +12V voltage in this socket to alter the
pulse width of the oscillator square wave.
Sawtooth Out
This is the audio output for the sawtooth waveform. It ahs a fixed level output.
Square Out
This is the audio output for the square waveform. Its level is affected by the square level pot.
General Specification
Inputs
CV
PWM
Outputs
SAW
SQUARE
Controls
Tune
Square Level
Size
6HP
Power
+/-12V, GND using Doepfer power socket.