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This simple board allows you to neatly and painlessly install LEDs on top of a rotary encoder for use with transparent/translucent knobs.
I designed this board when building a MIDIbox SID synthesizer based on the MB6582 design. The idea was inspired by Hawkeye's control surface build tutorial for the MB6582, but I didn't think I'd personally be able to do a very neat job with enamel wire, and so I decided to design a simple PCB to make it easier to achieve this kind of lighting.
The PCB has been verified to fit perfectly over Alpha Taiwan RE160F-40E3-20A-24P-003 and Bourns PEC16-4220F-N0024.
The PCB has space for three surface-mount LEDs and one resistor. The size of all parts is 0603 imperial (1608 metric).
There are multiple + (positive) terminals that you can use to daisy-chain multiple PCBs together if you need to.
The three LEDs are wired in series, and share a common resistor (R1). The proper value for R1 will vary depending on the specifications of your LED and the voltage of your power source.
If your LEDs have a low enough voltage drop, you may be able to just bridge R1 (or use a 0 ohm resistor) and use a 5V power source. The amber LEDs I used did not light up at all this way however, and so I chose to use a 9V source instead.
You can use a simple LED calculator to help choose the right value for R1. In my case, using the datasheet for my amber LEDs I entered the following information into the calculator:
The result was 150 ohms, and so that's the value I used for R1.
Note: In the last photo above, the wires are shown above the PCBs. This was a mistake, as when test-fitting the metal front panel, there wasn't quite enough clearance, and so I moved them below the PCBs instead. I recommend you do the same.
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