Warm Tube Clock
Assembly Instructions for the „IN-16 Nixie shield“
Document Version: 2011-01-05
www.elektronika.ba
-5-
Step 2
Now we need to solder the RGB LEDs LED1, LED2, LED3 and LED4. We could have done it at the same
time, together with TLC59401, but since it already came soldered on the PCB we have to do it with
the soldering iron.
1. The LEDs are not that small, so soldering should take a
minute or two.
2. Place the LED in the position but keep in mind about its
common Anode pin. The common Anode is marked on the
PCB as you can see – the upper right corner has a white
mark. The first pin on this RGB LED is actually a Cathode of
the RED LED-part, so by following the IC marking
convention the common Anode is the fourth pin of this
RGB LED.
3. After placing the LED in its position, you can hold it in
place using tweezers while firstly soldering it’s any pin
(“tacking” it actually). After “tacking” it into place with
some solder, you can solder the remaining pins and then
go back to solder the “tacked” pin. While soldering these
LEDs, you actually don’t need to touch the LED with the
soldering iron. It is enough to touch the PCB under the
LED’s pin and it will solder it.
