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3D Model
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Overlay
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Plan View
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Schematics
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Chicklet 1 PCB |
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Chicklet 2 PCB |
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Filter PCB |
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Main PCB |
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Constructors should refer to the Component Overlays along with,
the PCB Bill of Materials for the current value of all components, and
the General Construction Notes for general PCB assembly guidelines.
MAIN PCB
Install all components as per the Main PCB Overlay with the exception of Q702, Q1202 and R1614.
A wire link needs to be fitted between S302_3 and S703_3.
CHICKLET 1 PCB Assembly
Fit 6x 1x1 Headers from the under side of the PCB in to the 6 central pads. Cut the pins (topside) as low as possible.
Install the TO-78 transistor after first spreading the legs out so that they can be located in to the 6 outer pads. Make sure the TO-78 stands clear of the header pins (allow at least 1mm clearance).
Install the chicklet1 assemblies in to positions Q702 and Q1202
CHICKLET 2 PCB Assembly
Populate the chicklet-2 PCB as per the Chicklet-2 PCB Overlay. NB: U1604 is mounted direct to the PCB.
Cut 2 pieces of tinned copper wire to a length of 25mm. Solder in to the holes at X3 and X4 with wires on the upper side of the PCB.
Strip approximately 3mm off one end of the 6 lengths of wire and insert, from the topside, in to the following locations:-
X1 |
BROWN |
X2 |
ORANGE |
X4 |
GREEN |
X5 |
RED |
X6 |
BLACK |
X7 |
BLUE |
Solder each wire and then feed the other end through its adjacent hole and pull through.
The Chicklet-2 assembly is mounted at right-angles to the PCB with the 2 wires at X3 and X4 locating in to the pads of R1614.
Form the 6 leads and cut/strip each one to reach its location as shown on the Main PCB Overlay.
Connections X5, X6 & X7 on the Main PCB should be made to the underside of the PCB at the points indicated on J1602 and P1603.
JUMPERS
The following jumper positions should have a small wire link fitted in the noted positions:-
- JP1201 between pins 1 & 2
- JP1202 between pins 1 & 2
Jumper JP1101 should be fitted with a 2-pin header in pins 2 & 3.
Jumper JP1301 should be fitted with a 2-pin header but the shunt should not be fitted except during the calibration process as described.
A wire link should fitted in P1602 across pins 1 & 2 .
FILTER PCB
Install all components as per the BOM.
FIRMWARE OPTIONS
There are 2 sets of dipswitches on the main PCB which provide for the following options:-
S1302 - MIDI Address.
This 4-position switch sets the MIDI Channel that the Odysseus will respond to. By default this is set to MIDI Channel 0. When a switch is in the 'ON' position it's value is zero so, for example. for MIDI Channel 0 all 4 switches should be set to 'ON'
S1301 - Options. This switch is used to enable (ON)/disable (OFF) certain features within the firmware:-
- RETRIGGER. This switch will force the GATE to momentarily go low and then back to high on each key press and forces the AR and ADSR envelope generators to restart
- MONOMODE. This switch selects either DUAL MODE (dispwitch OFF) or MONO MODE (dipswitch ON):-
- MONO MODE - In this mode the keyboard will always recognise the next key played as the 'active' key and will forget the previous key, even if it is held down. VCO2 can then be set, via its panel controls to be detuned from VCO1 as desired
- DUAL MODE - In this mode the keyboard allows the player to press and hold one note and then play a 2nd note while the 1st is held on. When only one key is being pressed, both VCOs will play the same note.
- Unused
- Unused
PORTAMENTO
As VCO2 is 'CV locked' to VCO1 when in MONO MODE, the [PORTAMENTO] control will work on both VCOs.
However, in DUAL MODE VCO2 is driven with both VCO1 CV and an 'offset CV' that allows VCO2 to play a different note to VCO1. Because the [PORTAMENTO] only affects VCO1 CV and not the 'offset CV', VCO2 will 'jump immediately' to its assigned note.
