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Page History:

DateAutorwhat
15.Jan.2018LED-man1.1 BOM added, glitch issue, page design changes
20.April 2018LED-mangithub link added, firmware link, pcb version added
09.May 2018LED-manFirmware Versions updated, REV2.0 pcb page added

Table of Contents



Deckard's Dream Synthesizer

Hi all, this is the place to find the latest building documents for Black Corporation's Deckard's Dream polyphonic synthesizer.

Currently, this project is at rev 1.0, PCB's are currently being released to builders. (18.Oct. 2017) and are being constructed.

A new PCB version rev. 2.1 is planned and the release is planned for July 2018, this page is only for rev.1.x

the REV.2.0 guide is here DDRM 2.0 Build Doc Home

Product Info:

the Deckard's Dream product is available as Build to order and DIY KIT Version, both released in 2017.

Its also known or coined as the "DDRM".

The difference in the DIY KIT and assembled (Build to order) are:

  • the component format, the DIY KIT is mostly THT, the build to order synth is mostly in SMT.
  • The case size is not as deep for the build to order as it is for the DIY.

Note: Although the DIY has most of the SMT devices pre-installed onto the PCBs, there are over 675 SMT decoupling capacitors (0805) and one small (SOIC8) power switch device that MUST be installed by the builder, in addition to the through hole components

A addional 1U expander is planned - more later in a addional page


Examples of Presets and voices: https://soundcloud.com/deckardsdream


Technical Specs: (click to expand)

Synthesizer features

  • 8-voice polyphonic analogue synthesizer
  • Fully analogue signal path
  • 2 synthesis layers per voice
  • 256 presets

Layer architecture

  • VCO with square, saw and sine waveforms
  • PWM with sine-wave LFO
  • Manual PW (50-90%)
  • 12dB HP and LP discrete filters with separate resonance controls
  • ADSR filter envelope with adjustable initial and attack levels
  • ADSR VCA envelope
  • Velocity and aftertouch controls for filter brilliance and volume levels

Master controls

  • Global coarse/fine tune
  • VCO2 detune
  • LFO with sine, saw, ramp, square and stepped random waveforms
  • LFO destinations: VCO, VCF, VCA
  • Crossfade between layers 1 and 2
  • Global filter brilliance and resonance control for additional resonance
  • Polyphonic aftertouch destinations: LFO speed, LFO to VCO amount, LFO to VCF amount, filter brilliance, volume level
  • Keyboard tracking adjustment for VCF and VCA

Controls

  • MIDI/MPE with polyphonic aftertouch
  • Polyphonic pitchbend
  • Unison
  • MIDI over USB
  • 128 factory and 128 user presets
  • Alternate scales and tunings
  • Software editor by Spektro Audio

Display

  • 128×64 OLED display

Connectors

  • DC input jack (9-24V)
  • External modulation input jack (1/4″)
  • Expander jack (DIN5)
  • USB jack (type B, device/host)
  • MIDI IN jack (DIN5)
  • MIDI THRU jack (DIN5)
  • AUDIO OUT LOW jack (1/4″)
  • AUDIO OUT HIGH jack (1/4″)

Physical specifications

  • 19″ 4U rack-mount
  • Width: 483mm / 19″
  • Height: 178mm / 7″
  • Depth: 200mm / 7.8″
  • Weight: ~ 4.8 kg / 10.6 lbs incl external PSU brick.




Current identified Errors/Omissions/Errata:

DateLocationIdentified issue

Resolution


Oct 20, 2017PCB: Motherboard rev 1.0

Steve Sommers - Capacitor C188 designation is duplicated. C186 is missing.

From Roman:

Oct 21, 2017

PCB: Voice card

Rev 1.0

 Resistors R40, R45, R151 and R146 have space on the circuit boards, but there is nothing specified in the BOM

These are not used and were left in place for possible filter modifications. Leave the components spaces empty (do not put anything there).


Nov 11, 2017

PSU Board

Rev 1.0

DACs not initializing on some boards. Note: Updated in BOM 1.0.8

PSU Board Changes per Roman: 

Change C12 to 1uf 6.3V or higher

Change C13 - 330uf 6.3V or higher 8MM DIA /3.5 LS

C13 increased delays the boot of +3.3v digital rail, c12 reduced makes 5v analog rail boot faster,
so, DACs start with no problem

Without change sometimes they don’t start, since digital 3.3v comes to DAC before 5v


Dec 23, 2017

All boards

Roman suggests that both power consumption, and heat reduction can be obtained by substituting all TL072/TL074 OPAmps with the lower current TL062/TL064. Roman also states that the pre-built units contained the TL062/TL064sThis was first suggested as a substitution for the voice cards only with TL072/TL074s being used on all other boards. However, Roman has since updated the BOM to use TL062/TL064s throughout. (REV1.0.9)

Jan 15,

2018

All Voiceboardswaveform glitch not the same like CS-80

To apply the "glitch fix", you will need to solder two 1.0 Meg resistors per voice board, one for each oscillator. They can be easily added to the back side of the circuit board, so all existing components can remain unchanged.
In the schematic, the 1M resistors should be added to the voice board from IC4 pin 4 to +12V, and from IC4 pin 5 to +12V. Below is an image of the modification done to my voice board, showing you the optimal locations for the resistors to minimize lead length. The tolerance for the resistors is not critical at all, 5% resistors can be easily used. If needed, you can apply a small amount of silicon glue to hold the resistors in place, or even add insulation to the leads to prevent the possibility of a short. 

click to enlarge


Bugtracker

further bugs, issues, problems are reported here (here are user reported issues due to soldering failures or other issues reported too)

https://github.com/ffont/ddrm-issues/issues


Deckard's Dream Home and Storehttp://www.deckardsdream.com


Current BOM 1.10  from 08.Jan.2017

DD-BOM-REV1.1.0.pdf

DD-BOM-REV1.1.0.xlsx


Shared Mouser Basket: https://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=9ba27b85b3   (not approved - check for SMT caps)

Ultravox reply: "The cart doesn't include items that the BOM says are sourced from eBay, Small Bear, synthcube, etc."

About partsourcing:  check the price for the next price break ( 3 resistors are more expensive than 10)

for EU users: order from www.TME.eu standard parts, its cheaper as mouser


BOM Changelog

REV1.1.0 CORRECTED THE AMOUNT OF DIP16 SOCKETS

REV1.0.9 TL074 CHANGED TO TL064, TL072 CHANGED TO TL062. HEAT SINK, THERMAL PAD, COOLING FAN AND MOUNTING HARDWARE ARE OPTIONAL IF TL06X OPAMPS ARE USED. VOLUME KNOB AND SLIDER CAPS PART# CHANGED.

REV1.0.8 CHANGED C12 TO 1uF, C13 TO 330uF ON THE PSU BOARD

REV1.0.7 CHANGED R2 ON THE OUTPUT BOARD TO 22R, CHANGED C6 ON THE MOTHERBOARD TO 10uF

REV1.0.6 CHANGED 1N5817 TO BAT85S ON THE MOTHERBOARD

REV1.0.5 ADDED USB A TO USB B ADAPTER

REV1.0.4 CORRECTED 30K MOUSER PART # IN A VOICE CARD

REV1.0.3 CHANGED HEAT SINK QUANTITY, C2 ON OUTPUT BOARD IS 100uF NOW REV1.0.2: ADDED ST LINK PROGRAMMER

(please note the version and changes at the bottom of the sheets. Also see Errors/Omission and Errata above)

Official Build Guide:  http://www.deckardsdream.com/build

Voice Card Assembly Document. This was created by Lysandre Follet, and has been tested as correct by a couple builders.


good to know

some users plugged the powersupply in a voicecard slot and earn a damaged ARM processor.

to minimize this risk, few solutions:

put a tape on the voicecard slots 2-8

or use a cable tie to shorten/bind the powercable between powersupply and breakoutboard as short as possible (you can´t attach the powersupply furthermore in a voicecard slot

Firmware:

check the download location: http://www.deckardsdream.com/downloads/  for updates, i prefer to wait few weeks before you install a newer version, or check the closed facebook group for comments.

Description: DECKARD'S DREAM BOOTLOADER REV1.0 
http://www.deckardsdream.com/downloads/DD-BOOTLOADER-REV2.0.hex


official Firmware

Firmware installation procedure/guide: Software Loading Procedure R0.9.3.docx

http://www.deckardsdream.com/downloads/DD-1.2.3.zip (updated factory presets file and an extra presets bank by Michael Rosner (comes as a BANK2))

http://www.deckardsdream.com/downloads/DD-FIRMWARE-REV1.2.1.bin  (preferred)


Tested/stable Firmware: (don´t install the latest firmware on important productive environments, please wait few weeks after an release/update of the firmware/bootloader, that minimize outages/malfunctions/data loss )

stable version:

If you have a working DDRM and only want to update the firmware or soundbanks, just connect a USB cable to your Windows PC and drop the unziped file on the "storage device disk", the zip file contains a firmware file and 2 soundbanks (Bank2 are CS80 patches)


MIDI Chart (MIDI Control Change Message Mapping for the DDRM) http://www.deckardsdream.com/downloads/DD-MIDI-CHART-REV1.0.pdf


Build: Deckards Dream General Build Thread

Discussion: DIY CS-80 imminent...(Deckard's Dream)

https://www.facebook.com/groups/deckardsdream/


Usage:

to get the full power of your DDRM use a polyphone Midi Keyboard with poly aftertouch.

the DDRM can analyze the "new" MPE protocol over Midi.

just try a Roli Seaboard or a Linnstrument

more MPE devices are listed here: http://www.rogerlinndesign.com/other-mpe-controllers.html

Parts Resources:

Synthcube complete parts kits: http://synthcube.com/cart/ddrm-deckard-s-dream-kit

Thonk Group Buys for CEM3340: https://www.thonk.co.uk/shop/curtis-cem3340-ic-vco-chip/

Metal Case: DIY Hub http://siddarthianinnovations.bigcartel.com/product/deckards-dream-pre-order-front-panel-and-rack-case

Wooden Case: Ross Lammond (UK) http://www.lamonddesign.co.uk/index/


a very helpful Tool for the SMD Soldering: (and sponsoring for this website hosting)

(link here )




Wooden Case: Ross Lammond (UK) http://www.lamonddesign.co.uk/index/




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