MiniMod Dual Contour User Manual
Contents
1. A sna 1 SUSTAIN Z EG 2 Sustain EG 2 Man Trigger 0 10 TRIG EG 2 Output SAGATE1 OUT1 GATE2 2 EG 2 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 This is the Gate Input for EG 2 and performs in the same manner as EG 1 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 This is the manual trigger button for EG 2 Sets the speed of the attack cycle of EG 1 which can be varied from around 10 millisec ondes to 10 seconds Sets the speed of the attack cycle of EG 2 which can be varied from around 10 millisec onds to 10 seconds 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 1 EG2. f 5 EG 2 Level Out J2 Sets EG 1 output offset voltage A voltmeter accurate to 1mV or better is required to A EG 1 Offset adjust this trimmer To adjust Connect the voltmeter to EG 1 Output Turn decay switch on set Attack Decay and Sustain controls to 0 Measure the output voltage and carefully adjust Offset Trimmer 1 until output voltage is less than 40mV Sets EG 2 output offset voltage The calibration process is the same as that for EG 1 EG 2 Offset EG 1 Jumper J1 Removing J1 reduces the output level of EG 1 by approx 30 as explained earlier in EG 1 Output section 15 D EG 2 Jumper J2 Removing J1 reduces the output level of EG 2 by approx 30 as explained earlier If you need any help using this module or have any technical questions please feel free to contact us at support ajhsynth com Copyright AJHSynth 2014
3. 1 Decay Switch 12 EG 2 Decay Switch 3 EG 1 Status LED EG 2 Status LED 15 EG 1 Output EG 2 Output 10v 8v 4v Output Level 2v 6v Attack Phase 1 Decay 1 l 8v 6v 4v 2v Gate Signal 0 Time p Single Trigger Gate On 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 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 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 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 With switch down the decay function is active on EG 2 when the switch is up the decay is instantanious Gives a visual indication of the output level of Envelope Generator 1 Gives a visual indication of the output level of Envelope Generator 2 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
4. 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 This is the output from EG 2 and the signal levels are identical to EG 1 see above Fast Multiple Retrigger Sustain Level 0 to 8 Volts Sustain Decay 2 Always the same rate as Decay 1 Gate Off Fig 1 An Illustration of MiniMod Envelopes Adjustment and Calibration Note This information is given for completeness the MiniMod Dual Contour Generator is calibrated after manufacture and under normal circumstances should not require any user adjustment 36 a Se e f e owo oo fk ty mr gt ax at o D H or Si ae J or Be her fm 7 U so ta N wm 75 sy D Wih ee 4zi VP EO a N 2 in ott oh O Ag E DN A CO ae 5 ee a iF 8 p r P 1 oe ud i a lt N d J woe how O all lt lt ie at EG 1 Level Out J1 L M a a ee oe ee ee y AD cw pg a YA a AT as vE i
5. MINIMOD Dual Contour User Guide Discrete Transistor Envelope Generators 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 firstly 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 filter opens incrementally with each extra key press We have added independant Decay switches for each Contour Generator rather than the shared switch
6. 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 fixing 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 SYNTH www ajhsynth com EG 1 Status Led EG 1 Attack EG 1 Decay Switch EG 1 Decay EG 1 Sustain EG 1 Man Trigger EG 1 Gate Input O 000009 EG 1 Output O EG 1 Gate Input EG 1 Gate Input 2 EG 1 Man Trigger 4 EG 2 Man Trigger EG 1 Attack Controls inputs and outputs MNMOD 2 F CONTOUR GENERATORS Pa EG 2 Status Led ATTACK 1 ATTACK 2 EG 2 Attack 6 5 a EG 2 Decay 3 DECAY DECAY 1 600 a Pe EG 2 Decay Switch
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