The tube brightness can be changed in software by adjusting how high the boost converter voltage is set which is changed by adjusting the boost PWM duty cycle. Changing the brightness will keep the clock readable in different settings. This setting is stored permanently in EEPROM.
Please note: VFD tube life seemt to be related to driving voltage. So we suggest keeping the brightness lower if you can, as it will keep the tube lasting longer!
How to set the brightness
Press the MENU button until Set brit is displayed.
Now press the SET button to change the brightness.
The current setting is shown.
You can change the brightness by pressing the + button.
Once you are satisfied with the brightness, wait 10 seconds or press the SET button again.
Last updated on May 04, 2015
Published on Mar 06, 2013