Warm Tube Clock
Assembly Instructions for the „IN-16 Nixie shield“
Document Version: 2011-01-05
www.elektronika.ba
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Step 4
Now locate the resistors R3 and R4: 3k9 (3.9k) and 10k, respectively. The 3k9 resistor defines the
current that will be provided to the RGB LEDs (and also to the opto-couplers) – for more information
about this LED current, see the TLC59401 datasheet. The 10k resistor is simply a pull-up resistor for
the BLANK line of the TLC59401 IC. It is there to make sure all LEDs are turned off in case Atmel AVR
doesn’t have the correct firmware loaded.
1. Put them in place and solder them. Left one is the 3k9,
the right one is the 10k.
2. So it looks like this from the bottom view.
