Doug,
I have built several of the LED IN A KEYCAP for both the K1 and K2.
Unfortunately, I was never successful in soldering wires to the SMD LED
that Ron (SK) supplied toward the end of his last run of the CW Tuning
Indicator.
The 3.3k SMD resistors may have been his solution after I told him about
the difficulty soldering to the LED, but I simply don't know.
I always used the HP HLMP series diodes for the Led In Keycap, they have
leads. I don't know if DigiKey still has them, but I can spare a yellow
one if you send me a SASE at my QRZ address.
73,
Don W3FPR
On 6/19/2020 9:57 PM, Douglas Hagerman via Elecraft wrote:
> Can anyone explain how the SMD LED is to be mounted in the key cap for the K1 or K2 installation of the K6XX CW Indicator? I have an unbuilt kit (well, it is built now) and the key cap kit, but no instructions for how to install the LED. The key cap in the kit is drilled, and the LED appears to fit into the rectangular opening in the key cap so that the LED would shine out the hole. But then how do you connect to the LED?
>
> There are also two SMD 3.3k ohm resistors in the key cap kit. I can visualize putting the LED in the cap, and then soldering the two resistors onto the LED into a U-shape, and then wires onto the ends of the resistors, I guess. That would give a resistor value comparable to the 6.8k ohms mentioned in the main part of the kit.
>
> The main part of the kit also has a regular (large) LED that I could use with the “looking out an existing hole” method, but the keycap idea seems attractive—IF I can figure out how to do it!
>
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