AJH Synth Dual Contour Bedienungsanleitung

AJH Synth Nicht kategorisiert Dual Contour

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Dual Contour User Guide

Thank you for purchasing the AJH Synth MiniMod Dual Contour module, which like all AJH Synth

Modules, has been designed and handbuilt in the UK from the very highest quality components.

We hope that it will help and inspire you towards creating some great music and soundscapes!

It comprises two independant Envelope Generators in a single 12hp wide Eurorack module.

These are very accurate replicas of the vintage Model D Contour Generators, with identical all

transistor EG circuitry, using the correct +9.3V and -10v supply voltages of the original. This

ensures that they exactly replicate the original envelope response, along with all of the associated

eccentricities. Extra features include manual trigger buttons and envelope status LED’s.

There are two factors that are absolutely essential when attempting to faithfully recreate the

iconic Model D envelope behaviour and function, rstly the very fast exponential slope , which

when used in conjunction with the (near) linear slope of the original VCA is largely responsible

for the famous Model D “punch”. Secondly, the re-trigger behaviour is quite unique; multiple

retriggering progressively increases the output level so that either the volume increases incre-

mentally or the lter opens incrementally with each extra key press.

We have added independant Decay switches for each Contour Generator rather than the shared

switch of the original synthesiser, these switches change the Contour response from decay active

(switch down) to zero decay (switch up) when the gate signal goes low. The actual envelope

response is ADSD (Attack, Decay 1, Sustain, Decay 2), where Decay 1 and Decay 2 speeds are

always equal.

Module width is 12 HP of Eurorack space and it is compatible with standard Eurorack cases. The

height of the panel is 128.5mm and depth is 26mm . There are four mounting holes at the

corners of the module and we provide 4 of M3 rack xing screws along with a Eurorack compat-

ible power cable. Current consumption is 38mA from the +12V supply rail and 15mA from the

-12V supply rail.

All AJHSynth modules are covered by a one year guarantee against manufacturing defects.

Note:

It is very important that the power supply ribbon cable is connected correctly, see the “adjustment and

calibration” section for an illustration of the correct orientation.

Discrete Transistor Envelope Generators

www.ajhsynth.com

mod

CONTOUR GENERATORS

mod

OUT 1 OUT 2GATE 2GATE 1

TRIG TRIG

ENV 1

DECAY

ENV 2

DECAY

SUSTAIN 1

DECAY 1

ATTACK 1

SUSTAIN 2

DECAY 2

ATTACK 2

2 8

4 6

0 10

2 8

4 6

0 10

200 5

600 1

10 10

ms Sec

200 5

600 1

10 10

ms Sec

200 5

600 1

10 10

ms Sec

200 5

600 1

10 10

ms Sec

EG 1 Status Led

EG 1 Attack

EG 1 Decay Switch

EG 1 Decay

EG 1 Man. Trigger

EG 1 Gate Input

EG 1 Output

EG 1 Sustain

EG 2 Status Led

EG 2 Decay

EG 2 Decay Switch

EG 2 Sustain

EG 2 Man. Trigger

EG 2 Output

EG 2 Gate Input

EG 2 Attack

1 EG 1 Gate Input : The Envelope Generator cycle of EG 1 is started (triggered) by a gate signal to this Input,

alternatively it can also be triggered using the EG 1 Manual Trigger switch (3). The

Eurorack standard gate voltage is + 5 Volts, however any voltage above +2V will trigger

the EG successfully and gate voltage levels up to +10V are acceptable.

2 EG 1 Gate Input 2 : This is the Gate Input for EG 2 and performs in the same manner as EG 1

3 EG 1 Man Trigger : Pressing this button triggers the Envelope Generator, sustain will be active for as long as

the button is held down - it is the equivalent of pressing a note on a keyboard.

4 EG 2 Man Trigger : This is the manual trigger button for EG 2.

5 EG 1 Attack : Sets the speed of the attack cycle of EG 1, which can be varied from around 10 millisec-

onds to 10 seconds.

6 EG 2 Attack : Sets the speed of the attack cycle of EG 2, which can be varied from around 10 millisec-

onds to 10 seconds.

Controls, inputs and outputs

7 EG 1 Decay : Sets the speed of the decay cycle for EG 1, and can be varied from 10 milliseconds to 10

seconds. The decay cycle commences either when the attack reaches its maximum level

or the gate pulse ends, whichever happens sooner.

With the gate high (on) the envelope will decay down to the sustain level. Immediately

the gate goes low the decay recommences from the sustain level and decends down to

zero at the rate determined by the EG 1 Decay Control - see Fig 1.

8 EG 2 Decay : Sets the speed of the decay cycle for EG 2, and can be varied from 10 milliseconds to 10

seconds. The decay cycle commences either when the attack reaches it’s maximum level

or the gate pulse ends, whichever happens sooner.

9 EG 1 Sustain : Sets the sustain level, between 0 to 8 volts for EG 1. It is only active when the gate is high,

as soon as the gate goes low the decay cycle recommences.

10 EG 2 Sustain : Sets the sustain level, between 0 to 8 volts for EG 2. It is only active when the gate is high,

as soon as the gate goes low the decay cycle recommences.

13 EG 1 Status LED : Gives a visual indication of the output level of Envelope Generator 1

11 EG 1 Decay Switch : With switch down the decay function is active on EG 1, when the switch is up the decay is

instantanious. This mimics the action of the Model D decay switch but we have added an

individual switch for each envelope rather than one switch which acts on both both.

12 EG 2 Decay Switch : With switch down the decay function is active on EG 2, when the switch is up the decay is

instantanious.

14 EG 2 Status LED : Gives a visual indication of the output level of Envelope Generator 2

15 EG 1 Output : This is the output from EG 1, and is typically between 0 and 8 volts, however with multiple

retriggering the output can go as high as 11 volts. This is not a problem to the CV inputs

of the MiniMod VCF and the MiniMod VCA which can safely handle these signal levels,

however caution is advised when connecting to Eurorack modules from other manufac-

turers.

We have included jumpers on the pcb (J1 and J2) which when removed lower the

nominal output voltage from 8 volts to 5.5 volts and limit the peak signal to 8 volts.

Please note that this jumper should be removed if using with other modules unless you

are certain that the higher CV voltages can be safely accommodated.

16 EG 2 Output : This is the output from EG 2, and the signal levels are identical to EG 1 (see above)

Sustain Level

0 to 8 Volts

Attack Phase Decay 1 Decay 2

Always the same

rate as Decay 1

Sustain

10v

Gate On On On On OnGate O

Time

Fig. 1 - An Illustration of MiniMod Envelopes

Single Trigger Fast Multiple Retrigger

Output LevelGate Signal

Produktspezifikationen

Marke:	AJH Synth
Kategorie:	Nicht kategorisiert
Modell:	Dual Contour

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