Eurorack Module
XR22 VCO FT
VCO with Ring Modulation Input and FSK (Frequency Shift Keying)
Front view
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Amplitude Modulation (AM) Input
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Ring modulation
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CV controllable sine/triangle volume
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Advanced waveform generation by AM
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Rgb-LED for optical control
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FSK (Frequency Shift Keying)
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Pulse and ramp generation
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Switching between two different frequency CVs
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Advanced waveform generation by FSK
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LFO-, Bass-, High- Mode
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Switchable Sync-Mode (from Rev.6)
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Width: 12 HP
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Dimensions: 128,5 mm x 60,6 mm
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Depth: 35mm
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Current: +12V: ≤103mA; -12V: ≈42mA
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Optionally available in banana version
The XR22 VCO FT with AM input provides direct amplitude control of the sine/trianglewave by an external signal. An audio signal as AM input will be ring modulated by the oscillator frequency. When using a control voltage for AM, the sine/» read more
The knob ‘Gain’ is adding a positive/negative DC voltage to the oscillator’s amplitude control – for shifting the modulation point, loudness control or muting (when the external input signal is 0). The ratio between the (modulated) oscillator output and an applied AM input can be mixed with the bypass knob.
The FSK (frequency shift keying) feature is allowing to switch between two different oscillator frequencies – by hand, by a logic signal or by the oscillator’s squarewave itself. These two frequencies are controllable by the two big-sized knobs and their respective fine-
For optical overview, there is a full-color LED visualising the XR22 VCO FT‘s sine/triangle output and a bicolor LED for indicating the FSK state.
Sync Mode (New from Rev.6): The socket in the lower right corner is now offering double functionality: Either it is working as a F2-1V/oct. CV input or as a Sync logic input (replacing the CV input), depending on the state of the new switch ‘Sync ↔ F2 CV 1V/Oct.’. » read less
» read more
The knob ‘Gain’ is adding a positive/negative DC voltage to the oscillator’s amplitude control – for shifting the modulation point, loudness control or muting (when the external input signal is 0). The ratio between the (modulated) oscillator output and an applied AM input can be mixed with the bypass knob.
The FSK (frequency shift keying) feature is allowing to switch between two different oscillator frequencies – by hand, by a logic signal or by the oscillator’s squarewave itself. These two frequencies are controllable by the two big-sized knobs and their respective fine-
For optical overview, there is a full-color LED visualising the XR22 VCO FT‘s sine/triangle output and a bicolor LED for indicating the FSK state.
Sync Mode (New from Rev.6): The socket in the lower right corner is now offering double functionality: Either it is working as a F2-1V/oct. CV input or as a Sync logic input (replacing the CV input), depending on the state of the new switch ‘Sync ↔ F2 CV 1V/Oct.’.
The FSK (frequency shift keying) feature is allowing to switch between two different oscillator frequencies – by hand, by a logic signal or by the oscillator’s squarewave itself. These two frequencies are controllable by the two big-sized knobs and their respective fine-
For optical overview, there is a full-color LED visualising the XR22 VCO FT‘s sine/triangle output and a bicolor LED for indicating the FSK state.
Sync Mode (New from Rev.6): The socket in the lower right corner is now offering double functionality: Either it is working as a F2-1V/oct. CV input or as a Sync logic input (replacing the CV input), depending on the state of the new switch ‘Sync ↔ F2 CV 1V/Oct.’.
» read less
Side view right I
Side view right II
Side view right III
Back view
Banana version
Panel drawing
Side view left II
Side view left I
Sounds
AM In: Rhythm Machine; Output: Sine/Triangle – Oscillator frequency manually controlled
AM In: Rhythm Machine; Output: Sine/Triangle – Frequency CVs in: Sequencer and LFO
AM In: Rhythm Machine; Output: Triangle with FSK (Ramp) – F2 CVin: LFO
2 XR22 VCOs cross-patched FSK In ⇔Square Out – AM In: Rhythm machine; Frequency CVs in: Sequencer
Sync Mode: 1. Cymbal with pickup ⇒ Peak+Hold ⇒ XR22VCOFT AMin; 2. Rhythm machine ⇒ Peak+Hold ⇒ Delay1022 frequency CV modulated with synced XR22VCOFT triangle; 3. Sync mode in audio range; 2 XR22VCO FTs with sequencer F CV in; 1stVCO is syncing the 2nd
Or listen on
https://soundcloud.com/cg-products/sets/xr22vco
Video
About AM (Amplitude Modulation)
The triangle/sinewave output amplitude varies linearly with the control voltage applied to “AM in”. The modulation amount can be adjusted with knob ‘AM In’. Negative CV’s will cause phase inversion of the triangle/sinewave output.
Examples:
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| Ring modulation with external triangle signal | VCO volume control with external envelope signal | AM in connected to triangle/sinewave output (feedback) |
About FSK (Frequency Shift Keying)
The frequency of the XR22 VCO is controlled by two independent control sections F1 and F2 with their each independent manual frequency controls and CV inputs; either one or the other of these routes can be selected by a logic signal applied on socket “FSKin” and/or by switch “FSK”.
Examples:
a) Depending on the logic state of FSK control , either only F1 (with knobs “F1” and CVins “F1”) or only F2 (with knobs “F2” and CVins “F2”) is active
b) In the low position of switch “FSK” the FSK input is connected to the VCO’s own squarewave output and the oscillator frequency-shifts itself.
Now the oscillator produces ramp or sawtooth waves on its sine/triangle output and pulse waves on its squarewave output.
Rising and falling edges of the ramp wave and pulse/pause times of the squarewave can be independentlyand separately with knobs F1 and F2 and/or by their respective CV inputs.
c) By applying an external logic signal on input “FSK in” (with switch “FSK” in the middle position) the oscillator switches between F1 and F2
About Sync-Mode
With switch ‘Sync ↔ F2 CV 1V/Oct.’ in upper direction: ‘Sync’; socket ‘Sync/
With knob ‘Gain’ in cw position or a positive AM-CV, the sine/trianglewave oscillation will restart at its positive peak.
With knob ‘Gain’ in ccw position or a negative AM-CV, the sine/trianglewave oscillation will restart at its negative peak.
Please note: The panels of the modules are made from untreated natural aluminium, hand printed and varnished. Due to this manufacturing process, their surface may have little scratches or unregularities or may slightly differ in their color appearance.
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