AJH Synth MiniMod Dual Contour - Manual

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, 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 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.
Discrete Transistor Envelope Generators
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