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The
PolyDAC was a 4-channel MIDI-CV Converter originally designed
by Paul Maddox
and later the design was released to the general public.
The
PolyDAC(X) is now available here, with permission from Paul
Maddox, and I am now
able to supply a new PCB and 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
CC1, CC2, CC3 and CC4: 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
IGNORE/STEAL :- (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.
Power Supply:
+15V @150mA, -15V @ 60mA
Updated
schematics
are provided below and readers are advised to visit
Paul's website for further
details on the original designs.
PolyDAC
V3.3 Schematics
PCB
Overlay V3.2 V3.3
Bill
Of Materials
Example
Panel Wiring Details
Download
PolyDAC V3.9 files
1U 19" Rack Enclosure with Front Panel
Available with 3.5mm jacks, 6.35mm jacks and 4mm banana sockets
  
Photo
on the left shows the White-on-Green
(3.5mm version only) 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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