IV-27 IceTube clock Rev. 0.38 board operating on 5.25 volt supply

2 layer board of 6.15 x 1.02 inches (156.1 x 26.0 mm)

13 Digit VFD Clock using IV-27 tube - Main board 5 Volt input. From Xmas Icetube Rev D. Added second MAX6921 for additional segments, and DS32KHZSN TCXO oscillator. Increased AC1 and AC2 trace width to support 185 mA current with less voltage drop. Removed 5 volt regulator and associated components. Replaced D2 with MAX40203 Ideal diode and improved layout, Rev 0.38

Adapting the IV-18 IceTube clock design to use the 13 digit IV-27 VFD tube.

After successfully building several of the IV-18 revision 2.2 clocks, and having an abundance of spare time due to the COVID-19 pandemic, I decided that I wanted to build a project that utilized the 13 digit IV-27 VFD display tube.

My first thought was to build a calculator to utilize the added digits, until I received a request from my wife for a clock that displayed the day of the week constantly. That would definitely put to use the extra digits of the IV-27 tube, so I started to see what changes would need to be made to adapt the IceTube clock design.

A very nice IV-27 pinout from the Ebay auction where I purchased the tubes

IV-27 IceTube clock Rev. 0.3 operating on a 9 volt supply with extra heat-sink

https://www.barbouri.com/2020/07/04/iv-27-icetube-clock-project/