ADSR - Synthesizer 2hp - Free user manual and instructions

Type	Eurorack synthesizer module
Brand	2hp
Model	ADSR
Category	Envelope generator
Width	2 HP (approx. 10.16 mm)
Depth	40 mm (typical Eurorack)
Weight	50 g (approx.)
Power supply	+12V / -12V via Eurorack bus board
Current consumption	30 mA (+12V) / 20 mA (-12V) typical
Controls	Attack, Decay, Sustain, Release knobs
Inputs	Gate (0-5V), Trigger (high-trigger)
Outputs	Envelope CV (0-5V or 0-8V typical)
LED indicator	Yes, illuminates during envelope stages
Envelope modes	ADSR with gate input; trigger for retrigger
Construction	Skiff-friendly, suitable for shallow cases
Installation	Disconnect power before inserting; align ribbon cable correctly
Maintenance	Wipe with dry cloth; avoid liquids
Safety	Handle with care; keep away from moisture
Spare parts	Not user-serviceable; contact 2hp
Reparability	Only qualified technicians; no user replaceable parts
General info	Compact and precise ADSR envelope generator for Eurorack

Frequently Asked Questions - ADSR 2hp

What is an ADSR envelope?

ADSR stands for Attack, Decay, Sustain, Release. It is a four-stage envelope generator that shapes the amplitude or other parameters of a sound over time. The Attack sets the time to reach peak, Decay to fall to sustain level, Sustain level held while gate is high, and Release time after gate ends.

How do I power the 2hp ADSR module?

Connect the included ribbon cable to a standard Eurorack bus board. Ensure the red stripe aligns with the -12V pin. The module requires +12V and -12V rails; typical current draw is 30mA on +12V and 20mA on -12V.

What are the input and output voltage levels?

The gate input expects a 0-5V signal (typically 5V gate). The trigger input responds to a rising edge. The envelope output usually ranges from 0V to +5V or +8V, depending on the module's design.

Can I use the ADSR with a sequencer or MIDI-to-CV converter?

Yes, the ADSR accepts standard gate/trigger signals from sequencers, MIDI interfaces, or other Eurorack modules. Use a 3.5mm patch cable for connections.

What is the difference between the Gate and Trigger inputs?

The Gate input holds the sustain stage as long as the signal is high. The Trigger input resets the envelope to attack phase on a rising edge, useful for retriggering without waiting for the gate to end.

How do I calibrate the ADSR?

The 2hp ADSR is factory calibrated and typically does not require user calibration. If you suspect issues, contact 2hp support. No trim pots are exposed on the front panel.

What is the maximum depth allowed for my case?

The module depth is approximately 40mm (1.6 inches). It is skiff-friendly and fits most Eurorack cases, including shallow ones. Always measure your case depth before installing.

Can I replace the knobs or faceplate?

Knobs are removable for customization. The faceplate is not intended for replacement. Attempting to disassemble the module may void the warranty.

Why is the LED not lighting up?

Check that the module is properly powered and that the ribbon cable orientation is correct. The LED only lights when a gate/trigger signal is present and the envelope is active. If still not working, test with a known working source.

How do I clean the module?

Disconnect power. Wipe the front panel and knobs gently with a soft, dry cloth. Do not use cleaning agents, water, or abrasive materials. Avoid getting moisture into the jacks or pots.

USER MANUAL ADSR 2hp

Description

ADSR is a four-stage linear envelope with two expressive ranges. Each stage can be modified independently allowing for the creation of complex, multi-segment envelopes. Great for modulating filters, VCAs, and oscillators.

• 4 independent stages
- Wide voltage output at 0V – 10V
• 2 expressive ranges
- Easy to use interface

Table of Contents

Installation/Specifications 4

ADSR 5

General Functions Overview 6

Installation

To install, locate 2 HP of space in your Eurorack case and confirm the positive 12 volts and negative 12 volts sides of the power distribution lines. Plug the connector into the power distribution board of your case, keeping in mind that the red band corresponds to negative 12 volts. In most systems, the negative 12 volt supply line is at the bottom. The power cable should be connected to the ADSR with the red band facing the front of the module.

Specifications

Format: 2 HP Eurorack module

Depth: 47mm (Skiff Friendly)

Max Current: +12V = 24mA

-12V = 7mA

1. GATE:

Gate input

An envelope will emit from OUT when a gate signal is received at the GATE input

Threshold: 2.5V

2. RANGE:

Toggle that will switch between two ranges

If the toggle is up, the slow range will be selected
If the toggle is down, the fast range will be selected

Slow Range: 0.54ms – 5 sec per stage

Fast Range: 5ms – 30 sec per stage

3. LED:

LED indication of the envelope emitted from OUT

4. OUT:

Envelope output

Range: 0V - 10V

5. ATTACK:

Sets the attack time of the envelope

If the knob is far left, the attack time will be as fast as possible based on the currently selected range

If the knob is far right, the attack time will be as slow as possible based on the currently selected range

6. DECAY:

Sets the decay time of the envelope

If the knob is far left, the decay time will be as fast as possible based on the currently selected range

If the knob is far right, the decay time will be as slow as possible based on the currently selected range

7. SUSTAIN:

Sets the sustain level of the envelope

If the knob is far left, the sustain level will be as low as possible

If the knob is far right, the sustain level will as high as possible

8. RELEASE:

Sets the release time of the envelope

If the knob is far left, the release time will be as fast as possible based on the currently selected range

If the knob is far right, the release time will be as slow as possible based on the currently selected range