We find that wiring a YuSynth PCB to the front panel controls is both time consuming and often detracts from the overall finish. We are not able to alter the YuSynth PCBs to make panel wiring easier so we approached the problem from a different angle. We chose to mount the front panel controls on a mini PCBs (breakout boards) that take the panel controls to a JST type XH socket into which is plugged a lead (not included with set but available separately). This lead is then dressed to the main MFOS PCB (or sometimes to other panel controls) and soldered into the respective pads. Many breakout boards have solderable jumpers for making common connections as well as thin tracks to cut where panel mounted resistors need to be connected inline with say a pot wiper. YuSynth projects may require multiple breakout boards so we bundle these altogether and offer them in one ST Synth Panel Breakout PCB Set. The pack description will further describe the wiring colour code and what if any links need to be made or cut.
This method does have other advantages other than just time saving and appearance:
- Time saving
- Neater more professional appearance - improves resale value
- Takes care of common connections between panel components
- Has space to accommodate panel mounted resistors and capacitors
- Can improve reliability - have you tried soldering a diode, LED and a wire to one pin on a toggle switch on the 16-step sequencer?
- Makes fault finding easier
If you have any reservations about using connectors, then simply solder wires direct to the breakout boards. Takes longer but you still get all of the other advantages.
The boards are designed to fit our front panel component spacing so you will see references to pitch and whether it is in the 'x' or 'y' or both direction. At the time of writing, there was 40+ breakout boards developed for pots (using pot brackets), sockets (jack and banana), switches and LEDs. Whilst these will not take care of every panel component on all of the YuSynth projects, it will go a long way to achieving it. As we work through making up each YuSynth project with these breakout boards, we will see where improvements can be made or even create more breakout boards to provide the best possible solution.
The panel PCBs can also be used with our MFOS range. YuSynth PCBs are better laid out as regards panel wiring but can still take advantage of these breakout PCBs.
This pack contains the following breakout PCBs:
- 7210-703 x 1
- 7210-733 x 1
Whilst you can solder wires between the breakout PCBs and the main PCB, we do recommend using our JST cable assemblies. For the Steiner VCF, you will need the following:
- 7210-109 x 1
- 7210-110 x 1
See the Build Guide tab for wiring information on how to use these breakout PCBs with this module.
Guidelines when building a Steiner VCF module using our panel PCBs, front and back panels, PCB holder and the YuSynth main PCB.
- Assembled YuSynth PCB #7220-005
- Front Panel #7220-505
- Back Panel #7220-805
- PCB Holder #7220-901
- 3-Way Pot PCB #7210-703 (1 reqd.)
- 9-Way 1/4" Jack Socket PCB #7210-733
- 10-way Cable Assemble #7210-110
- 9-Way Cable Assembly #7210-109
- PCB Holder Brackets Fixing Kit #7210-181
- PCB Mounting Fixing Kit #7210-182
- Additionally you will need our Switchcraft Jack Sockets #7212-205 (Pack of 5)
- Knobs of your choice, we recommend our Cliff KM20B
Panel PCB Preparation
PCB #7210-703 requires links A, B&G solder bridging.
PCB #7210-733 requires links J5 & J8 solder bridging
Pot PCB Assembly
Make sure the solder bridges A, B & G are done before assembly as it is very difficult to solder G afterwards.
- Solder in JST headers noting that the slots in the socket housing point towards the top of the board on the pot
- Remove any anti-rotation lugs on the pots
- Insert pot into bracket and temporarily do up lock nut
- Insert pot with bracket into PCB and solder in position ensuring the pot bracket sits flat on PCB. Only solder the bracket lugs on the bottom of the board
- Repeat for remaining pots
- Remove pot nut
Socket PCB Assembly
General advice an assembling socket boards can be found on the PCB product page. Solder bridges J5 & J8 are required as it allows for a ground connection. Ensure the JST socket is also soldered in before the sockets. Sockets to solder in are:J1, J3, J6, J7 & J9
Panel PCBs Completed
You now have the 2 panel PCBs populated and ready for assembly to the panel (front and back panels)
Assembly order is PCB mounting angle brackets, socket PCB, pot PCB, PCB holder, rotary switch,remaining two pots, finally the main MFOS PCB itself
With the assembly of the Panel complete, it's time for the wiring.
Firstly, plug in the JST cable assemblies, they will only go in one way around as they are keyed.
Not all of the wires are need so these can be cut short at the header. The table below indicates which wires to cut.
3-Way Pot PCB
Socket PCB Cable
|J9||Violet||Resonance pot CCW|
|J7||Blue||Input Pot CW|
|J6||Green||Position R6 on pot PCB|
|J5||Orange||Input pot CCW|
|J3||White||Position R9 on Pot PCB|
The switch and two individual pots require additional wiring as follows
Rotary switch is wired direct to the YuSynth PCB
The pots ...
|Signal In Pot CW||Blue||From J7 on socket PCB (see above)|
|Wip||IN1 on YuSynth PCB|
|CCW||Orange||From J5 on socket PCB (see above)|
|Resonance Pot CW||Red||CW|
|CCW||Violet||From J9 on socket PCB (see above)|
Once each wire is routed and soldered, it will be ready for dressing. We use 100mm cable ties to dress the cables.
Wiring is now complete except for the supply whcih depends on your own system. We solder in a 3-core cable with a plug on the end which we use for power distribution in our racks. For other systems there is a choice of 3 different power connetcors. Next is a visual inspection and we also apply power before inserting chips to check for correct polarity across one of the IC sockets.
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