DDRM 1.0 Build Doc Home

History:

Date	Autor	what
15.Jan.2018	LED-man	1.1 BOM added

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.

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.

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

Current identified Errors/Omissions/Errata:

Date	Location	Identified issue	Resolution
Oct 20, 2017	PCB: 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 Voice 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/TL064s	This is a suggested substitution for the voice cards only. TL072/TL074s should still be used on all other boards. TBD on this as an official BOM change, or any additional issues.
Jan 15, 2018	All Voiceboards	waveform 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

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

Current BOM 1.10 from 08.Jan.2017

DD-BOM-REV1.1.0.pdf

DD-BOM-REV1.1.0.xlsx

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)

Build Guide (Under Construction): http://www.deckardsdream.com/build

Firmware:

Description: DECKARD'S DREAM BOOTLOADER REV1.0
Download filename: DD-BOOTLOADER-REV1.0.hex

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

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

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

Muffwiggler Forums:

Build: Deckards Dream General Build Thread

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

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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