Cg products Delay1022 User manual

Modular

Delay1022

Analog BBD delay

1. Introduction

This module is no classic echo, but a delay designed for audio rate feedback and

sound sculpturing. The 1V/oct. tracking and feedback CV input makes it suitable

for many VCO-like applications, for creating drum and string -like sounds and/or

for room ambience. There is a certain amount of noise, as to be expected from analog D delay

modules, however the Delay1022's clear and brilliant sound in combination with the manually

controllable output low pass filter makes this completely tolerable.

2. Features

–Delay times from 2.5 ms to 50ms (without T CVin)

–CV controllable delay time (≙ feedback frequency)

◦ Good 1V/oct tracking

–Feedback CV control input

–2nd delay output behind feedback-contolling VCA

◦Delay muting

◦Noise reduction

–Manually controllable output lowpass (12d )

◦Noise reduction

◦Sound control

–Available with banana or 3,5mm minijacks

–Eurorack module

–Width: 12 HP

–Dimensions:

128,5 mm x 60,6 mm

–Depth: 52mm

–Supply voltage: ±12V

–Power consumption: ≈ 90mA

Front view Left side view Right side view Drawing

Modular

3. Functions

D selector This switch decides if one (512 stages) or two

(1024 stages) Ds ( ucket rigade Device) are used for

delay generation.

Delay Time Manual control of delay time. The range is from

around 1,3ms to 25ms for D switch in upper position

and from ca. 2,5ms to 50ms for the switch in its lower

position (≙ 400-20Hz / 760-40Hz in self-oscillating mode).

This knob adjusts the frequency of the internal D clock

VCO from ≈200kHz to ≈10kHz.

The range can be extended by adding a CV to one of the

respective inputs.

Feedback Loop mode switch In the upper position 'normal',

the delayed signal is routed back to the D's input with its

normal polarity.

(Amount of the back-routed signal depends on the setting

of the poti 'Feedback' and/or a control voltage applied on

'Feedback CVin' )

In middle position 'open', the feedback loop is interrupted.

This allows to insert devices like filters, modulators etc. in

the loop by using the 'In2' input and the 'Delay Out'

output .

In the lower position 'inv.', the delayed signal is inverted

and sent back to the D's input with negative polarity.

Input1 The D's audio signal input. The signal applied on In1 will be mixed with the D's delay

output; the mixed signal is provided on output socket

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('Mix out'). The ratio of the mix (dry-wet)

is adjusted with knob ('In1↔ Delay').

In1 Level adjusts the level of the audio signal from In1 .

Mix Output Output signal mix of the D's delayed output and the input signal applied on

'In 1' . The ratio between the two signals (≙ dry-wet) can be adjusted by using knob ('In1↔

Delay') .

Input2 2nd audio signal input for the D. Unlike 'In 1' , this input does not have an input level

and a dry/wet mix control.

In1↔ Delay Ratio between the signal from input 'In1' and the delayed signal (≙ dry↔wet). The

mixed signal is provided at

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Modular

Lowpass Filter Manual cutoff frequency control for the 12db lowpass filter at the end of the D

stage. This control knob may be useful to reduce noise and for sound control.

Delay Time CV Input 1 manual control for the signal level of a delay time CV (Control Voltage)

signal applied on socket T Cvin 1 .

Feedback CV Input manual control (Polarizer) Adjusts the level of feedback CV (Control Voltage)

for a feedback CV signal input applied on socket Feedback CVin . In center position (denter

locked) the input level is 0. Turning this knob clockwise, the incoming feedback CV signal will be

normally added to the feedback control signal adjusted with knob . y turning the knob ccw, the

polarity of the CV signal becomes inverted resulting in a substraction/attenuation of the feedback

control voltage.

Note:

The polarizing denter knob is a new feature of

Rev.3

of the Delay1022.

Feedback: Manual control of feedback. The delay output is fed back into the D input via an

internal VCA (Voltage Controlled Amplifier). The feedback VCA can be manually controlled with this

knob and/or by adding a control voltage to the feedback CV input . From 5-6 on the scale the

delay begins to self-oscillate.

Delay Time CV Inversion Switch Inverts the incoming signal on socket 'T CVin 1' .

Note:

If you are using a delay time CV input (non inverted) for delay time/ frequency modulation,

the feedback sustain may be linearized for different delay times by splitting the T CVin signal and

putting a small amount of this CV into the Feedback CV input. The output level of the Ds is not

constant over the whole delay time range, though the feedback sustain is not linear for different

delay times; e.g., with the same setting of feedback controls, for a short delay time the tone fades

away; while a longer delay time (or lower frequency) will cause a feedback oscillation. y increasing

the feedback level for higher frequencies by adding a proportional CV to this input this problem can

be minimized.

Feedback CV Input Control voltage input for the feedback amplification. Its amount can be

adjusted by using the Feedback CV in knob . A positive input voltage will increase the feedback;

a negative voltage will – in combination with manual control knob 'Feedback' - attenuate or mute

the feedback.

Delay Output This 2nd delay output is behind the internal feedback VCA. Unlike output 'Mix'

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, the

output level is directly dependent of the settings of knob 'feedback' and/or the input on socket

'feedback CV in' ; e.g. if the 'feedback' knob is set on '0' on scale (fully ccw), there will be no

output signal. This muting option can be useful to reduce noise and/or for sound modelling.

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Modular

Delay Time CV Input1 Control voltage input for delay time (feedback frequency). Polarity of the

incoming signal can be inverted with 'Inv.' switch ; its amount is adjustable by using poti

'T CVin 1' .

Delay Time 1V/Oct. CV Input 1V/Octave input. The feedback frequency (e.g. in self-oscillating

mode) is a function of the delay time ( Frequency = 1/T) . (It may be necessary to readjust the

tracking. See chapter 4: '

Adjustment

' )

Audio routing

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F1/com Pot

F2 Pot

F1 Octave

F2 Octave

F1/com CV ins

F2 CV ins

Switch

"com"

FSK in

Switch "FSK"

(without

F1 Octave)

Output

BB 1 BB 2

Lowpass

Filter

BB selector

switch

Mix Out

VCA

Delay

Out

Feedback Control

Feedback

CVin

Feedback

In 2

In 1

In1 elay

In1 Level

Cutoff frequency

Feedback loop

switch

Modular

4. Adjustment

The Delay1022's Timebase VCO is already carefully adjusted to 1V/Oct.

If you realize that the Delay1022 isn't in tune with your further analog synthesizer equipment, it could

be necassary to retune it.

Procedure (Suggestion)

1. Switch on your equipment and the Delay1022 and wait ½

hour until the oscillators have warmed up.

2. Set manual frequency control to ≈ '2' on scale and bring

D selector in upper position.

Turn the 'Lowpass' filter knob fully ccw.

3. Connect a CV from a keyboard (or a similar CV source) both

to your favorite VCO's 1V/oct. input and to the Delay1022's

1V/oct. input

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(You can also use the us CV; to activate the Delay1022's

us CV input see chapter5: '

us CV

4. Connect both devices, your favorite VCO and the

Delay1022, to a sound system, that you can listen to them

simultaneously.

5. ring the Delay1022 in self-oscillating mode by turning

knob 'Feedback' fully clockwise.

6. Play a 'C' (65,41Hz), or a similar note, on your keyboard . The VCO should be in pitch with the

keyboard. The note should be nearby the tone you have adjusted on the Delay1022.

7. Adjust poti 'Time' until the pitch of the Delay1022 is the same as that of the 2nd VCO.

8. Play a note ≈ 2-3 octaves higher (e.g. c2, ≙523,3 Hz). Adjust trimmer Tr1

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on the back of the

module (see above) until the Delay1022 is tracking to the 2nd VCO (zero-beat).

9. Play a note 1 octave higher than in step 8, e.g. 1046,6 Hz (3-4 octaves higher than the ground

note). If necessary, adjust HF trimmer

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until both tones are tracking (zero-beat).

10. Go back to step "6" and repeat all other steps until both devices are in tune.

5. Bus CV

Jumper "JP1" right: "off" position (PC ) : The us

CV is not connected.

Jumper "JP1" left: "on" position (PC side): The us

CV is controlling the Delay1022's delay time.

Modular

6. Furt er Adjustments

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1V/Oct. Adjustment

See above:

4.Adjustment

D1 output attenuator

(Feedback insertion point)

Output attenuator for D1; due to the

position of knob 'Feedback' , ensuring the

same amplitude and feedback level for D1 in

relationship to D2 and to avoid upcoming

self-oscillation when switching between D1

and D2 (switch ).

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VCA operating point

The setting of this trimmer determines the

VCA's working point – at which position of

knob 'Feedback' the delay will begin to self-

oscillate; by default this point is set on 5-6 on

the scale (2 o'clock).

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Feedback compensation for short delay times

For short delay times, the audio signal gets more attenuated – causing a shorter feedback for

short delay times. To avoid this, this effect is internally compensated. Value of compensation is

set by this trimmer.

HF-Trim

See above:

4.Adjustment

For completeness - however these settings should not be changed:

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VCA output offset

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D chips input bias

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Feedback time potentiometer range

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Modular
7.Patc es
Simple patches (with other CG Products' modules)
Patch Description Audio Link
1. Delay1022 triggered with short impulses
The  dynamic pulse output of the 
PEAK+HOLD (or any other impulse source) 
feeding the Delay1022 is a simple way to 
create percussive drum and string-like 
sounds.
http://www.cg-
products.de/Audio/Delay-
Patch1_ImpulseIn-350.mp3
2. Delay1022 triggered with noise-bursts
 etter, because allowing more dynamic range
and more sound options, is using short 
noise-bursts or another short envelope-
shaped sound source to trigger the delay.
The X multiplier in this example is working as
a linear VCA.
http://www.cg-
products.de/Audio/Delay-
Patch2_X-ImpulseIn-
355+357.mp3
3. Delay1022 & XR22 VCO
The combination of the Delay1022 with the 
XR22 VCO opens up a wide variety of 
fascinating sounds.
XR22 VCO AM in: 
Rhythm machine;
XR22 VCO frequency 
modulated with PEAK+HOLD; 
Delay time modulated with 
sequencer & 2nd VCO:
http://www.cg-
products.de/Audio/Delay-
Patch3_XR22VCO-364.mp3
4. Delay1022 X modulated
With the delay's F  loop in inversion mode 
(Switch   in lower position 'inv') and the 
delay's output amplitude-modulated with 
itself, a 2nd 'voice' with interesting timbres 
and exponential dynamic can be produced, 
useful e.g. in stereo applications.
Delay In: Rhythm machine
http://www.cg-
products.de//Audio/Delay-
Patch4_outputX-367.mp3
5. Delay1022 & Pre
Embed acoustic instruments and sounds via 
microphone or pickup.
Delay effects, flanging, phasing etc.
PRE  In: Microphone/Trumpet
...Delay time modulation  with 
sinewave
http://www.cg-
products.de/Audio/Delay-
Patch5_Pre-trump-
377+378.mp3
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