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DH-ADSR User Guide
ADSR Envelope Generator with Delay, Hold and Retrigger
Thank you for purchasing the AJH Synth MiniMod DH-ADSR Envelope 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!
The DH-ADSR is a full ADSR Envelope Generator with selectable Delay, Hold and Retrigger in a
single 10hp wide Eurorack module. The discrete transistor circuitry is identical to that of the
vintage Minimoog Model D Contour Generator, but with an added Release control to allow full
ADSR control of envelopes. This faithfully recreates the original Model D fast and punchy
envelope response, along with the multiple key retrigger behaviour which made it so musically
useful. We have also added a manual trigger button, a Slow switch and an envelope status LED.
The DH-ADSR Module has three modes of operation:
ADSR Mode (DEL-HLD and RETRIG switches o ) In this mode it is a regular ADSR envelope
generator, with regular or slow envelope speeds.
Delay-Hold Mode (DEL-HLD Swich on, RETRIG switch o ) In this mode allows a variable delay to
be added between the external trigger pulse and the start of the envelope and it transfers control
of gate length to the Hold control instead of the external gate.
Delay-Hold-Retrigger Mode (DEL-HLD switch on, RETRIG switch on) This allows self retriggering
so that repeating ADSR envelopes with variable "o " time are possible and in this mode it will also
function as a unipolar LFO with an ADSR waveshape.
Module width is 10 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
compatible power cable. Current consumption is 30mA from the +12V supply rail and 12mA from
the -12V supply rail.
All AJHSynth modules are covered by a two 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.
www.ajhsynth.com
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Summary of Contents for AJH Synth MiniMod DH-ADSR
- Page 1 DH-ADSR User Guide ADSR Envelope Generator with Delay, Hold and Retrigger Thank you for purchasing the AJH Synth MiniMod DH-ADSR Envelope module, which like all AJH Synth Modules, has been designed and handbuilt in the UK from the very highest quality components.
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Page 2: Controls, Inputs And Outputs
Controls, inputs and outputs Manual Trigger Envelope LED Attack Control Release Control Decay Control Pre-Delay Control Sustain Control Hold Control Delay Hold Switch Retrigger Switch Envelope Output Slow Switch Gate Input Inverted Output Gives a visual indication of the output level of the Envelope Generator 1 Envelope LED : Sets the speed of the Attack slope of the envelope, and it can be varied from around 10 2 Attack Control :... - Page 3 The Envelope Generator cycle is started (triggered) by patching a gate signal to this Input, 7 Gate Input : alternatively it can also be triggered using the Manual Trigger switch (8). Any Gate voltage above +2V will successfully trigger the envelope and gate voltage levels up to +11V are acceptable.
- Page 4 The DH-ADSR module has three di erent Envelope Modes: 1) Regular ADSR mode (DEL-HLD switch up, RETRIGGER switch up) This is illustrated in Fig. 1 below. An attack, decay, sustain and release envelope is generated each time either a GATE signal is received, or the manual trigger button is pressed..
- Page 5 Envelope Modes (cont.) 2) DELAY- HOLD mode (DEL-HLD switch down, RETRIG switch up) - This mode is illustrated in Fig. 2 below. With the DEL-HLD switch down theDELAY and HOLD controls come into play. In this mode the incoming GATE signal is used as a trigger only, and the GATE length is irrelevant. A very short duration GATE or Trigger will initiate the envelope, and the length of the gate is not important, once the envelope has commenced the state of the gate signal is ignored When a GATE signal is received the DELAY phase is started, and the length of this time can be between 20mS and 10 seconds,...
- Page 6 Envelope Modes (cont.) 2) RE-TRIGGER mode (DEL-HLD switch down, RETRIG switch down) - Retrigger mode is similar to DEL-HOLD Mode in that the gate length is set by the HOLD control, and the “do nothing” time is set by the PRE-DELAY control, however when the RELEASE curve drops to almost zero then a pulse created internally and this is used to trigger the DELAY - HOLD circuit again, ad in nitum, which creates an LFO like continually repeating envelope.
- Page 7 Regular and Inverted outputs: Regular envelope output This is available from the OUT jack (13), and varies in amplitude between 0 and +8 Volts. The status of the envelope is shown by the front panel LED (1), it gets progressively brighter as the envelope output voltage rises, reaching maximum brightness with a +8 Volt output.
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Page 8: Adjustment And Calibration
Adjustment and Calibration Note: This information is given for completeness, the MiniMod DH-ADSR module is calibrated after manufacture and under normal circumstances should not require any user adjustment. A INV Out Bias INV Output Type (JP1) D EG O set...
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