Select 2 - Uncategorized Joranalogue - Free user manual and instructions

Product Type	Dual CV Processor (Eurorack Module)
Brand	Joranalogue
Model	Select 2
Module Format	Doepfer A-100 Eurorack compatible, 3U, 6 HP, 30 mm depth (incl. power cable)
Front Panel	Milled 2 mm aluminum with non-erasable graphics
Dimensions (H x W x D)	128.5 x 30 x 43 mm (module only)
Weight	Module: 80 g; with packaging: 165 g
Power Requirements	+12 V: 25 mA, -12 V: 25 mA
Power Protection	Reverse polarity (MOSFET)
Input Impedance	All inputs: 100 kΩ
Output Impedance	All outputs: 0 Ω (compensated)
DC Voltage Error	0.3 % maximum
Bandwidth	25 kHz (-1 dB)
Main Functions	Dual voltage-controlled signal processor: create, switch, mute, hold, invert, attenuate, offset, add/mix, and subtract voltages (CV to audio)
Key Features	Two signal inputs per channel (normalized to +5V and 0V), gate-controlled selector, track-and-hold with low droop (minutes), gated polariser/attenuverter with unity gate input, automatic mixing of A and B outputs when A unused
Controls	Two polariser knobs, gate inputs (select, hold, unity), dual-color output LEDs
Gate Input Logic	Schmitt trigger: low threshold +2 V, high threshold +3 V; accepts weak/bipolar signals
Output LED Indication	Blue for negative voltage, red for positive voltage
Included Accessories	Product card, 16-to-10 pin Eurorack power cable, mounting hardware (2x M3 screws, 2x nylon washers, hex key), protective cotton bag
Compliance & Safety	Designed, manufactured, and tested for professional performance and reliability
Maintenance	No specific maintenance required; keep dry and clean; avoid exposure to liquids or extreme temperatures
Repairability / Spare Parts	Contact dealer or [e-mail]; mention serial number (found on product card or module rear)
Country of Manufacture	Belgium

Frequently Asked Questions - Select 2 Joranalogue

What is the Joranalogue Select 2 and what can it do?

The Select 2 is a dual CV processor in 6 HP Eurorack format. It functions as a 'Swiss Army knife' for modular systems, allowing you to create, switch, mute, hold, invert, attenuate, offset, add/mix, and subtract voltages from CV to audio rates.

How do the signal inputs work?

Each processor has two signal inputs: left (default) and right. The left input is normalized to +5 V, the right to 0 V when unused. A gate on the 'select' input switches to the right input.

What is the 'hold' function and how long does it hold a voltage?

The hold circuit freezes the input voltage on a rising edge of the hold gate. Thanks to low droop design, it can accurately store a voltage for several minutes, far longer than typical track-and-hold modules.

How does the polariser/attenuverter work?

The knob controls gain from -1 (inverted) at minimum, through 0 (attenuated) at center, to +1 (unity) at maximum. The 'unity' gate input disables the polariser, forcing unity gain regardless of knob position.

What happens when the A output is not patched?

If nothing is plugged into the A output, its signal is mixed together with the B output. This allows offsetting, CV mixing, pitch transposing, and more.

What are the power requirements?

The module draws +12 V: 25 mA and -12 V: 25 mA. It features reverse polarity protection via MOSFET.

What are the gate input voltage thresholds?

All gate inputs use Schmitt triggering: +2 V low threshold, +3 V high threshold. They are designed to be reliably driven by weak, slow, or bipolar signals.

Can the Select 2 be used for audio effects?

Yes, it works up to audio frequencies. Patch ideas include a ring modulator (using unity gate input) and an audio track-and-hold (using hold input) for 'downsample' effects.

What does the output LED indicate?

The bi-color LEDs show output voltage in real-time: blue for negative voltage, red for positive voltage.

How do I troubleshoot if the module isn't working?

First check your Eurorack power supply and connections. If problems persist, contact your dealer or [e-mail] with the serial number (found on product card or module rear).

USER MANUAL Select 2 Joranalogue

A 'Swiss Army knife' for your modular system. Select 2 provides two highly accurate gate-controlled voltage processors in 6 HP. These allow you to create, switch, mute, hold, invert, attenuate, offset, add/mix and subtract voltages, from slow control voltages (CVs) up to audio frequencies.

Each processor features two signal inputs, with the left input used by default. A gate on the 'select' input switches to the right signal input instead. The signal inputs are normalised to the precision +5 V reference (left) and 0 V (right).

Following the input section is a hold circuit. A rising edge on the 'hold' input freezes the input voltage at that moment, until the gate input goes low again. While most sample/track-and-hold modules only manage a few seconds, Select 2's 'low droop' design enables it to store a held voltage accurately for several minutes.

The end of the signal path consists of a gated polariser/attenuverter. Using the knob, the voltage at the output can attenuated and/or inverted: the gain is -1 (inverted) at the minimum setting, 0 at the centre and +1 (unity gain) at the maximum. The polariser can be disabled using the 'unity' gate input. This unique ability enables a variety of interesting gate-controlled signal modulations. Dual-colour LEDs show the output voltage of each processor.

Finally, if the A output socket is left unused, the signal is mixed together with the B output. This enables signal offsetting, CV mixing, pitch transposing etc.

CONTENTS

In the Select 2 box, you'll find:

• Product card, stating serial number and production batch.
  ■ 16-to-10-pin Eurorack power cable.
• Mounting hardware: two black M3 x 6 mm hex screws, two black nylon washers and a hex key.
• The Select 2 module itself, in a protective cotton bag.

If any of these items are missing, please contact your dealer or [e-mail].

CONTROLS & CONNECTIONS

1 POLARISER KNOBS

Each of the identical voltage processors features a knob to control the polariser. The signal is inverted at the minimum setting, fully attenuated (0 V) at the centre and remains unity gain at maximum.

2 OUTPUT LEDS

These bi-colour LEDs visualise the processor output voltages in real time: blue for negative, red for positive.

3 SIGNAL INPUTS

There are two analogue signal inputs for each processor, with the left input being used by default. For constant voltage generation, simply leave all input sockets unused: the left signal input is normalised to +5 V.

4 OUTPUTS

Each processor has an accurate, impedance-compensated signal output.

If nothing is plugged into the A output socket, its output signal is mixed together with the B output. This allows you to apply an offset to a signal, mix two signals etc.

5 HOLD GATE INPUTS

Apply a gate signal to the hold input to 'freeze' the input voltage. While the hold gate is high, any changes on the signal inputs are ignored. When gate goes low again, the circuit snaps back to the voltage at the currently selected input.

Each processor can thus function as a track-and-hold for both CV and audio. However, the exceptionally low leakage rate also allows minutes-long storage of pitch-accurate CVs.

All of Select 2's gate inputs are uniquely designed to be driven reliably even from weak, slow, bipolar signals. They feature Schmitt action, with a +2 V low and +3 V high logic threshold.

graph TD
    A["Select 2<br>DUAL CV PROCESSOR"] --> B["1: +5"]
    B --> C["SIG. INPUTS"]
    B --> D["OUT"]
    D --> E["3"]
    E --> F["5"]
    F --> G["HOLD SELECT UNITY"]
    G --> H["6"]
    H --> I["7"]
    I --> J["2"]
    J --> K["2"]
    K --> L["1: +5"]
    L --> M["SIG. INPUTS"]
    L --> N["OUT"]
    N --> O["4"]
    O --> P["5"]
    P --> Q["HOLD SELECT UNITY"]
    Q --> R["7"]
    R --> S["6"]

6 SELECT GATE INPUTS

This gate input selects between the processor's signal inputs: if unused or low, the left signal input is selected. A high gate signal selects the right input instead.

Apart from selecting between two inputs, this gated selector switch also allows you to create gate-activated constant voltages or to mute signals.

7 UNITY GATE INPUTS

The unity gate input is used to disable the polariser. When disabled, the output signal simply remains at unity gain, as if the polariser knob would be set to the maximum position.

PATCH IDEAS

GATED CONSTANT VOLTAGE GENERATOR

If none of a processor's signal or gate inputs are used, the +5 V reference voltage is sent to the polariser. Use the knob to generate a manually variable voltage between -5 V and +5 V at the polariser's output. This is useful for controlling CV inputs without dedicated knobs.

This constant voltage can be disabled (switched to 0 V) using the select gate input. When the select gate is active, the right signal input is selected, which is 0 V by default. The output signal can also be switched to +5 V using the unity gate input, which disables the polariser.

GATED ATTENUATOR/POLARISER AND MUTER

Similar to the gated constant voltage generator, except in this application an external signal is connected to the left signal input. Now the knob attenuates and polarizes the signal. Mute it with a select gate, and disable the polariser using the unity gate input.

RING MODULATOR

Select 2 can be used to create classic ring modulator tones. Set the knob to the minimum setting and connect your audio-rate carrier and modulator signals to the left signal and unity gate inputs respectively. The modulator should be a square or pulse wave for the best result, as this is a logic input. Use the knob to control the depth of the ring modulator effect.

AUDIO TRACK-AND-HOLD

Another classic synthesiser audio effect is the track-and-hold, creating digital-sounding 'downsample' tones using analogue circuitry. Patch Select 2 like the ring modulator, except the modulator is sent to the hold input. While the hold input is high, the carrier signal is 'frozen'. Once the hold goes low again, the output snaps to follow the carrier input. Vary the pulsewidth of the modulator to sweep from a subtle effect to full-on sample-and-hold.

VARIABLE WAVEMORPHER

Connect two different waveshapes from an oscillator (for example, sine and saw) to the two signal inputs, and the oscillator's pulse output to the select gate input. The result is a morphed signal, where each waveshape makes up part of the total period. By adjusting the oscillator's pulsewidth parameter, the morphing can be varied.

SEQUENCE SELECTOR

Patch two CV sequences to both signal inputs, and a gate sequence to the select gate input, all driven from the same clock. Now the gate sequence selects between both CV sequences: left when low, right when high. Easily create new hybrid melodies just by changing the gate sequence.

ATTENUATOR/POLARIZER AND OFFSET

Thanks to the mixing feature, both sections can be used together to both attenuate/polarise and offset a signal. Simply plug your signal into the left B input. The A knob controls the -5 V to +5 V offset, while the B knob controls the attenuation and polarisation.

This method also allows -10 V to +10 V constant voltages to be generated from the bottom processor, when all inputs are unused.

GATE-TO-AUDIO CONVERTER

If you have an audio-rate gate signal (switching between 0 V and +5 V), you can convert it to a standard zero-centred 10 V_pp (-5 to +5 V) signal using Select 2. Set one of the knobs to the minimum setting, plug your signal into the corresponding unity gate input, and leave all other inputs on that section unused. The output signal is a 10 V_pp square wave, not inverted with respect to the original gate signal.

SPECIFICATIONS

MODULE FORMAT

Doepfer A-100 'Eurorack' compatible module

3 U, 6 HP, 30 mm deep (inc. power cable)

Milled 2 mm aluminium front panel with non-erasable graphics

MAXIMUM CURRENT DRAW

+12 V: 25 mA

-12 V: 25 mA

POWER PROTECTION

Reverse polarity (MOSFET)

I/O IMPEDANCE

All inputs: 100 kΩ

All outputs: 0 Ω (compensated)

DC VOLTAGE ERROR

0.3 % maximum

BANDWIDTH

25 kHz (-1 dB)

OUTER DIMENSIONS

128.5 x 30 x 43 mm (H x W x D)

MASS

Module: 80 g

Including packaging and accessories: 165 g

SUPPORT

As all Joranalogue Audio Design products, Select 2 is designed, manufactured and tested with the highest standards, to provide the performance and reliability music professionals expect.

In case your module isn't functioning as it should, make sure to check your Eurorack power supply and all connections first.

If the problem persists, contact your dealer or send an email to [e-mail]. Please mention your serial number, which can be found on the product card or on the module's rear side.

REVISION HISTORY

Revision E: no functional changes.

Revision D: initial release.

With compliments to the following fine people, who helped to make Select 2 a reality!

Ben 'DivKid' Wilson Björn Jauss

Boris Uytterhaegen Gregory Delabelle

Jan D'Hooghe Jens Van Daele

Everyone at Wired Electronics

Select 2 User Manual version 2019-07-15

21 ^st Century Analogue Synthesis—Made in Belgium

© 2018–2019

Joranologue AUDIO DESIGN

[e-mail] https://joranalogue.com/