Nixie Tube Clock ‘Nixie QTC’
Issue 10a (21 March 2014)
www.pvelectronics.co.uk
- 42 -
9.
MOUNTING SINGLE COLOUR TUBE LEDs
Complete step 9 if you wish to use a single standard LED per tube
location. Note that the components for this step are not supplied.
The information is supplied for guidance only.
It is suggested to install each single LED across the central of the
RGB pin pairs. This corresponds to the Green LED channel in the
software settings. You will use the Green values to set the LED
brightness (regardless of the actual colour of the LEDs installed)
The circuit uses 2 X (3 LEDs in series), driven from 12V. The
current limiting resistors for the Green channel are R33 and R34.
Calculate the value of the resistors needed and ensure the power
rating of the resistor is suitable for the current that will be flowing.
A 2N7000 MOSFET transistor will need to be installed at the Q3
position to drive the LEDs in software on the Green channel.