Soundtronics Breakout Boards for Synths

MFOS Ring Modulator 5U Synth Panel Breakout PCB Set

 
£8.56 incl VAT
(£7.13 exc. tax)
7210-461
200.00 g.
In stock
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We find that wiring a MFOS PCB to the front panel controls is both time consuming and often detracts from the overall finish. We are not able to alter the MFOS 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. MFOS 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 30+ 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 over 40 MFOS projects, it will go a long way to achieving it. As we work through making up each MFOS 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 YuSynth 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:

  • 7210-704 x 2
  • 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 Ring Modulator, you will need the following:

  • 7210-110 x 1
  • 7210-112 x 2

See the Build Guide tab for wiring information on how to use these breakout PCBs with this module.

Guidelines when building a Ring Modulator module using our panel PCBs, front and back panels, PCB holder and the MFOS main PCB.

Parts needed

  • Assembled MFOS PCB #7210-061
  • Front Panel #7210-561
  • Back Panel #7210-861
  • PCB Holder #7210-961
  • 4-Way Pot PCB #7210-704, 2 off
  • Pot brackets #7300-000, 6 off
  • 3x3 Jack Socket PCB #7210-733
  • 10-Way Cable Assembly #7210-110
  • 12-Way Cable Assembly #7210-112
  • PCB Holder Brackets Fixing Kit #7210-181
  • PCB Mounting Fixing Kit #7210-182
  • Additionally you will need our Switchcraft Jack Sockets #7212-206 (Pack of 6)

Panel PCB Preparation

There are 3 panel PCBs, the two identical pot PCBs we will call Coarse and Fine. The third PCB is for the jack sockets.

Refer to the photo below of teh assembled pot PCBs when following these steps.

So, starting with the first pot PCB which will become the Coarse board so mark it with a 'C'.

  1. Solder link bridges B & H
  2. Solder in JST header noting that the slots in the socket housing point towards the top of the board on the pot
  3. Remove any anti-rotation lugs on the pots
  4. Insert pot into bracket and temporarily do up lock nut
  5. 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
  6. Repeat for remaining pots
  7. Remove pot nut

Now for the Fine pot PCB:

  1. Solder in JST header noting that the slots in the socket housing point towards the top of the board on the pot
  2. Remove any anti-rotation lugs on the pots
  3. Insert pot into bracket and temporarily do up lock nut
  4. 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
  5. Repeat for remaining pots
  6. Remove pot nut

Assemble the panel components as per the photo below including the Coarse pot PCB. Ensure the orientation and squareness of the jacket sockets are as shown.

For the socket PCB, first solder a 3k resistor into 'R10' position then solder in the header socket.

Wire the toggle switch (S1) as shown, the blue wire goes to R12 on the Coarse pot PCB. The yellow wire will be soldered later. You can also fit the Fine pot PCB.

Place the jack socket PCB over the socket pins and solder into position. You can also solder the yellow wire from S1 to X1 on the socket PCB.

Fit the MFOS PCB noting the orientation.

Now comes the wiring of the JST connectors.

The socket JST is first:

J10 Brown Gnd on the MFOS PCB
J9 Grey R12 on Coarse pot PCB
J9 Violet Cut, not needed
J7 Blue R9 on Coarse pot PCB
J6 Green CV1
J5 Orange Cut, not needed
J4 Yellow SINE
J3 White CV2
J2 Red Cut, not needed
J1 Black RMD

First solder in the brown, grey and blue wires as per the photo below.

Now the green, yellow, white and black wires. Note the brown wire ground pad on the MFOS PCB.

Solder brown, orange and violet wires to S2

Solder the brown to R10 on the Fine pot PCB. Orange to SW1 on the MFOS PCB. The violet wire to SW3 onm the MFOS PCB.

The Fine pot PCB JST connector can now be plugged in. The wiring is:

1 Black FF3
2 Red FF2
3 White FF1
4 Yellow Cut, not needed
5 Orange Cut, not needed
6 Green Cut, not needed
7 Blue IG2P3
8 Violet IG2P2
9 Grey IG2P1
10 Brown IG1P3
11 Black IG1P2
12 Red IG1P1

Wiring from the Fine pot PCB is all back to the MFOS PCB

The Coarse pot PCB JST connector can now be plugged in.

1 Black CF3
2 Red CF2
3 White CF1
4 Yellow Cut, not needed
5 Orange Cut, not needed
6 Green Cut, not needed
7 Blue GND on MFOS PCB
8 Violet IN2
9 Grey X2 on jack socket PCB
10 Brown Cut, not needed
11 Black IN1
12 Red Cut, not needed

The blue ground wire is soldered onto another ground pad on teh MFOS PCB adjacent to the blue wire soldered previously from the jack socket PCB. The grey wire is soldered to X2 on the jack socket PCB which can be seen better in two photos below. The remaining wires black, red, white, violet and black are all go to the MFOS PCB.

Dress the cables using small 100mm long cable ties.

Another view of the completed module wiring.

Wiring is now complete except for the +/-12V supply which 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. 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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