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The PolyDAC was
a 4-channel MIDI-CV Converter originally designed by Paul Maddox
and released in partnership with Tony Allgood of Oakley Sound
Systems. Recently this designed was released to the general
public and is now no longer supplied by Oakley Sound Systems
The PolyDAC(X) is
now available here, with permission from Paul Maddox, and I
am now
able to supply a new PCB and (optional) Component
Kit for this popular design.
Photo shows Rev 3 board
SPECIFICATION
Resolution
:- 12-bits on all analogue output
Gate (x4) scaleable from 5V to 15V (factory build = 7.5V)
Note (x4) 1V/Oct
Velocity (x4) 0-10V
Pitchbend -1V through 0V to +1V
Mod Wheel 0V through to 10V
After touch 0V through to 10V
Sustain 0V, 10V when on
CV A, CV B, CV C and CV D 0V to 10V
Retrigger :- When set to on and a new note comes in whilst an
old one is held,
the gate will ‘dip’ briefly.
Mode :- Mono1, Poly , Mono2
Poly 1 / 2 :- (Poly mode only) This allows you to select what
happens to incoming
notes when you have 4 held down. Poly1 new notes are ignored,
Poly 2 the oldest
note is replaced.
Assign :- This allows you to assign MIDI CC’s to the 4
‘CV’ outputs.
Updated
schematics are provided below
and readers are advised to visit
both Paul and Tony's
website for further details on the original designs.
PolyDAC
V3.3 Schematics
The
PCB
Bill
Of Materials
Example
Panel Wiring Details
Download
PolyDAC V3.6 Flash and EEPROM files
Download
PolyDAC V3.6 Source
Available
now - a 1U 19" Rack Enclosure with Front Panel
  
Photo
on the left shows the White-on-Green
panels. White on Black are
also available.
*
Please note that these schematics are re-drafts of the original
schematics and that
the following alterations have been made to them:-
- I have used a new designator series to improve
readability of the circuits
- Previously unused I/O pins on the ATMEGA
have been bought out for future expansion
- The PCB has been relayed out
- The transistor
drivers for the multiplexer have been changed for a CMOS level
translator
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