CG Products XR1-E Manual de usuario

XR1-E

Ring Modulation Oscillator

Analog Effect Device

Berlin 2013

The XR1-E is an analog ring modulator device with fixed sinus/triangle ring modulation

oscillator, suitable for both instrument or microphone input.

The oscillator pitch is adjustable by manual control over a wide range. n addition, the

frequency can be modulated by the integrated envelope follower (the oscillator pitch

changes dependent from the volume of the input signal) and LFO (low frequency oscillator)

as well as by an external CV signal or pedal. Original and effect signal are miscible by

controller, but the XR1-E also provides a footswitch input for external switching between

effect and original. Further, the ability of battery operation makes the instrument

independent from external power.

The XR1-E is based on an ancient function generator chip, which am using since many

years for musical purposes due to its warm and smooth sound.

Low noise high impedance preamp

Ring modulation oscillator frequency range:

High: 18Hz – 18000 Hz

Low: 0.1 Hz – 120Hz

Envelope follower and LFO for frequency modulation

Frequency CV input (1V/oct adjustable), also suitable for pedal use

Optional footswitch control

Output attenuator switch

Battery operation or external DC power supply (wide voltage range: 6-1 V)

Power dissipation: ca 600mW

Quick start guide

1. Insert batteries or accus (6x AA Mignon) or connect a power adaptor . Set the power

switch upwards to "On". Connect an amplifier, mixer etc. to the output . Set the

attenuator switch for instrument amplifiers in the lower position "low" , for line-in input

at a mixer to the upper "high" position. Connect an instrument or microphone to the

instrument input .

2. Set the frequency selector switch on "Hi". Turn the "Frequency" knob in middle

position.Turn the bypass pot in fully right position : "100%". Turn the envelope and LFO

modulation knobs , in fully left position: "0".

By turning the "Carrier Surpression" pot while listening to the oscillator tone, adjust the

tone to its minimum (≈ "0" on the scale; you may also use the green LED for indication).

Adjust the "Preamp" input gain controller while playing your instrument and listen for

optimal performance.

NOTE: It is not possible to eleminate the carrier (oscillator) tone completely. There will

always remain some overtone frequencies. Try to set the input pot on a high level (but

without distortion) to achieve best operation.

3. After you have detected the basic settings you can start to experiment, e.g. with different

oscillator frequencies , , ; add some frequency modulation with the LFO: for LFO

speed and for modulation depth, or activate the envelope modulation by turning knob

clockwise, etc.etc..

In-/Outputs and Control Elements

①On/Off Switch

Switches the power supply on or off.

ote: In combination with an external power adaptor only the XR1-E will be switched off

and not the power adaptor itself. This means that the power adaptor still may consume

some current for its own ("stand-by"). It is recommended to disconnect the adaptor

completly from public power supply if the XR1-E is not in use for a of longer time .

②External Power Supply nput

Allows the operation with an external standard DC power adaptor. The connection is a

standard DC plug with 2.1mm diameter hole. By using the external power supply input ,

the internal batteries will be switched off. The input voltage may range from 6V – 1 V.

Max. current dissipation is ca. 100mA (at 9V: ≈ 70mA). Take care on right polarity: The

"+"pole must be the outer contact.

③Output

Connect to an amplifier etc. The output voltage can be selected by the attenuator switch

for best adaption to the consecutive stage (e.g. line-in or instrument amplifier)

④Output Attenuator Switch

High: max. 8Vpp output voltage made for analog synthesizer inputs, line-in (mixer) inputs

etc..

Low: max. 0.8Vpp output voltage for instrumental amplifier inputs etc.

⑤nstrument nput

Input jack for instrument or microphone. Impedance: ca 2MΩ; max. input voltage: ≤3. Vpp.

⑥Preamp Gain Control

Adjustment of the amplification of the input preamp.

⑦Carrier Surpression Control

Controller for adjusting the oscillator (carrier) tone to its minimum. The "0" position in the

middle of the scale may be used as reference point, as well as the green LED – when dark

(and without input signal) – is suitable for indication of a minimum carrier tone amount.

ote: There will always remain a little bit of the oscillator sound (2nd harmonics etc.). For

best performance, make sure that the input signal level is high.

⑧Bypass Control

Ratio between input signal (preamplified) and effect signal. Turning the knob fully left will

provide the preamplified input signal only; by turning the knob clockwise the effect signal

will increase more and more and the original (dry) signal will disappear.Fully right position

= "100%": the pure ring modulation effect signal.

⑨Footswitch nput

Input jack for external bypass control, e.g. by a footswitch

•Switch opened: The dry preamplified input signal

•Switch closed: The effect signal (also depending on postion of the "Bypass" control

pot )

The switching also can be controlled by an external logic signal (0V = effect , + V = dry),

e.g. a gate signal from a synthesizer.

⑩Oscillator Frequency High/Low Switch

Hi: ≈ 18Hz – 18000 Hz (Audio range)

Lo: ≈ 0.1 Hz – 120 Hz

In "Hi" position, the oscillator is working in audio range. The amplitude modulation e.g.

will generate additional audio frequencies – sum and difference tones of the input signal

and the oscillator frequency.

In "Lo" position, the oscillator is working with subaudio frequencies. The amplitude

modulation effect is more like a" tremolo" sound. Volume of the input signal will change

constantly with the oscillator frequency.

⑪Oscillator Frequency Control

Rough adjustment of the amplitude modulation (AM) oscillator frequency.

⑫Oscillator Frequency Fine Adjustment Control

Fine adjustment of the oscillation frequency. Range is about 4 – semitones (quarte).

⑬Oscillator Waveform Switch

The oscillator waveform can be selected between sinewave and triangle. In " " (sine)

position, the effect is a more smooth sound with less overtones; in " " (triangle) mode the

generated sounds are rougher.

⑭LFO Frequency Control

Speed control of the internal LFO device (low frequency oscillator) for frequency

modulation of the ring modulation oscillator. Frequency is from ≈0.06Hz (left position ) to

≈ 44Hz (right position)

The LFO frequency is also displayed by the orange LED for easy visual confirmation.

⑮LFO Modulation Depth Control

Amount of LFO modulation depth

⑯LFO Waveform Switch

The LFO waveform can be selected between triangle (" ") and square (" ")." " will

provide a continously up-and down gliding pitch, while " " makes the oscillator shifting

between two tones.

⑰Envelope Follower/ext. CV Modulation Depth Control

The internal envelope follower converts the volume of the input signal into a control

voltage modulating the oscillator frequency. Amount of modulation can be varied by this

knob.

If the external frequency CV (= Control Voltage) input is in use, the envelope follower

will be switched off and instead the signal on will control the frequency and will be

adjusted by this pot.

⑱Envelope Follower Modulation: nversion Switch

Switches the the modulation (from envelope follower or external source) from positive to

negative. If the switch is in upper position, the pitch of the AM oscillator will increase with

higher volume of the input signal. switch in lower position (= " nversion") the pitch will

decrease with higher input volume. The inversion switch works also for a control voltage

signal connected to .

⑲External Frequency Control nput

Allows to control the oscillator pitch by an external control voltage (CV) or an external

resistor. By connecting a jack to this input, the internal envelope follower device will be

shut off and instead the fed in control voltage is adjusted by knob , regulating the

amount of pitch control by the CV.

The modulation CV also can be inverted by switch . Normally, a higher voltage will cause

an increasing pitch and vice versa. With in lower postion ("Inversion") a higher voltage

will cause a decreasing pitch and vice versa.

Further, a + V voltage (via 10kΩ resistor) is provided on , available on the middle

connector of a 3pole jack plugged in . Thus may be useful, for example, in combination

with a sensor or a pedal. In the latter case, a common passive foot pedal with 3pole jack

should work.

In combination with analog synthesizer equipment (e.g. sequencers, monophone

keyboards), it is possible to calibrate the XR1-E on 1V/Oct. by adjusting knob .

To calibrate on 1V/Oct for tracking with other instruments, connect the

external CV source to and set the pointer of the "Envelope/

ext.Modulation" controller to nearby "7" on the scale. This is a good base.

Then adjust by listening with different CV values until the pitch matches

with the pitch of your instrument.

Envelope/ext.Modulation

About Ring Modulation

Ring modulation is the multiplication of two bipolar audio signals by each other. Each value of a

carrier signal, C, is multiplied by a modulator signal, M, to create a new ring-modulated signal, R:

R(t) = C(t) x M(t)

(from: http://en.wikibooks.org/wiki/Sound_Synthesis_Theory/Modulation_Synthesis)

It is referred to as "ring" modulation because the analog circuit of diodes originally used to

implement this technique took the shape of a ring (Wikipedia).

For example: If one or both of the input signals C or M is 0V, the output R will be also 0V.

ote: In the case of the XR1-E the carrier signal is or , provided by the internal oscillator.

Examples

nput (=modulator) signal frequency >> oscillator (carrier) frequency ( ):

Input signal: metallophone

The volume of the metallophone sound varies with the oscillator amplitude.

nput (=modulator) signal frequency << oscillator (carrier) frequency ( )

Input signal: "Base drum" from rhythm machine The generated effect signal

The volume of the oscillator sound varies with the amplitude of the input signal

nput (=modulator) signal frequency ≤ or ≥ oscillator (carrier) frequency ( )

Input signal: "Mid tom" from rhythm machine

Complexe sound structures are generated, depending on the oscillator pitch.

Circuit Diagram

upport

Christian Günther

Forster Str. 0

10999 Berlin

[email protected]

Phone: ++49 30 61286299

Mobile ++49 178 7699267

www.cg-products.de

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