Sequencer Toggle Switch / LED Panel PCB (33x 14y Pitch)

8x Sequencer Toggle Switch / LED Panel PCB (33x 14y Pitch)

 
£4.98
(£4.15 exc. tax)
7210-798
100.00 g.
In stock
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Introduction

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. 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.

Specific Information on the Toggle Switch / LED PCB (33x 14y). Board size: 254 x 33mm

7210-798 PCB accommodates eight SPDT toggle switches, eight LEDs and 8 diodes. The required switch and LED connections are brought out to a 10-way JST connector (see 7210-110).

Assembly

Solder in the 8 diodes marked D9 to D16 on the PCB)

Solder in the JST sockets noting that the slots in the socket housing point towards the edge of the board.

With the 8 toggle switches fixed in position on the panel, solder the PCB to the switch connections

The LEDs are soldered in only when you are ready for final assembly on the front panel.

We find it easiest to insert each LED one at a time, forming the LED legs to align with the PCb holes. Note that their orientation needs to match the PCB. Rev 1 of the PCB has the + symbol incorrect, the LED long lead in this instance goes to the pad without the + symbol. This will be corrected in Rev 2, the flat side of the LED base is correct in relation to the PCB.

With all LEDs in position, you can commence soldering the LED leads.

The sequencer requires 2 PCBs, each PCB can be daisy changed by soldering links between the CBUS and GB pads

Wiring Colour Code

Pin 1 (black wire) is on the top of the board

Colour Function
Black S1
Red S2
White S3
Yellow S4
Orange S5
Green S6
Blue S7
Violet S8
Grey LED K Com
Brown Gate Bus

It is always worth checking the wire colour sequence to ensure it matches the above just in case there has been a mistake at the factory in the assembly of the cable.

 

Typical examples of projects that use this board: 16-Step quantized sequencer (see 7210-799 for the non-quantized sequencer)

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