ES-4

The ES-4 is a Eurorack format module which converts a standard S/PDIF input to five channels of control voltage.

Two of the five channels are calibrated to provide over 5 octaves of 1V/octave pitch CV. The remaining three channels are general purpose outputs (for use as e.g. gates, envelopes, LFOs) and each have a nominal range of 0-10V or ±5V (user selectable).

Since S/PDIF is a stereo-only format, the encoding of the five channels on to two is handled by software provided as part of Expert Sleepers Silent Way.

The ES-4 will connect to any audio device using the S/PDIF standard. This includes the digital audio output provided as standard on many recent Macs (more info here on the Mac connection).

The ES-4 also includes an S/PDIF output for sending data back to the computer. This output is used by expansion modules connected to the ES-4; currenty, the only such module is the ES-7 CV Input Expander.

The ES-4's specifications are as follows:

Panel width: 8HP
Module depth: 51mm
Digital input: coaxial S/PDIF, standard rates up to 192kHz
Digital output: coaxial S/PDIF
Analogue outputs: 5x 3.5mm jacks, DC-coupled
Output voltages
Channels 1-2: 0-5.3V (when trimmed for 1V/octave response)
Channels 3-5: 0-10V or ±5V (jumper selectable per channel)
D/A conversion: 8 bit, using high precision Analog Devices DACs
Indicators: LED for S/PDIF sync lock; 2 LEDs per channel on channels 3-5 indicate output voltage (+ve/-ve)
Expansion
5 headers for connecting ES-4 Gate Expander modules (see below)
Digital audio I/O header (I2S format) for future expansion
Current draw: 50mA on the +12V rail, 20mA on the -12V rail (70mA total)

The front panel is drilled for both Doepfer and Analogue Systems mounting holes (using a 'slot' rather than a single round hole). The power connector is a Doepfer standard 16 way IDC, with -12V furthest from the top of the board.